Thanks Sam for the reply. I went ahead and saved the phase inversion calibration
value and the sawtooth is now smooth.

Neal



--- In spectrumanalyzer@yahoogroups.com, "swetterlin" <swetterlin@...> wrote:
>
> Different cable lengths will move the PDM discontinuities left and right, but
if they in fact result from PDM inversion they will still be at -72 and -108
degrees. Neal's discontinuities were an abrupt shift in signal level, which is
the normal discontinuity. If you get something really wacko it may be the result
of having a strong (narrow) video filter without having increased the wait time.
It's counter-intuitive, but that can result in big spikes when the PDM inverts.
>
> Sam W.
>
> --- In spectrumanalyzer@yahoogroups.com, "Geoff Moore" <m0ore@> wrote:
> >
> > Neal,
> >
> > I am getting similar  but much worse results on my phase calibration
> > display.
> >
> > I was waiting until I had fully checked my build and found a way of
> > transferring the bmp file from the laptop ( with no internet access) to the
> > main PC so that I could post a similar message to yours.
> >
> > I suspected that it may have been caused by the initial calibration of
> > magnitude when the phase SLIM was not connected and I didn't disable the VNA
> > facility so giving false phase calibrations. I have since deleted all cal
> > files and re-loaded software but problem remains.
> >
> > Changing the lenth of cable shifts the deviations so I don't think it is
> > software.
> >
> > Geoff
> >
> > ----- Original Message -----
> > From: "nealmartini" <nealmartini@>
> > To: <spectrumanalyzer@yahoogroups.com>
> > Sent: Monday, December 14, 2009 7:11 PM
> > Subject: [spectrumanalyzer] Phase Detector Cal Question
> >
> >
> > I am down to the cal of the Phase Detector (VNA only) and am having a
> > problem. There are discontinuities in the phase plot using the 2 foot length
> > of cable between the TG and MSA input. I included the .bmp file in the
> > "Neal's Album" section of the group photo page
> >
> >
http://groups.yahoo.com/group/spectrumanalyzer/photos/album/995283679/pic/671608\
533/view?picmode=&mode=tn&order=ordinal&start=1&count=20&dir=asc
> >
> > Looking at the plot you will see the discontinuities. When I performed the
> > subsequent "PDM Inversion Cal" the "Current Inversion Cal" calculated was
> > 193.41 degrees. This not 180 plus/minus 5 degrees that the cal procedure
> > says I should get.
> >
> > I also bypassed the final filter to eliminate any funny contributions from
> > it, but the discontinuities were still there.
> >
> > Any suggestions?
> >
> > Thanks
> > Neal
> >
>

Different cable lengths will move the PDM discontinuities left and right, but if
they in fact result from PDM inversion they will still be at -72 and -108
degrees. Neal's discontinuities were an abrupt shift in signal level, which is
the normal discontinuity. If you get something really wacko it may be the result
of having a strong (narrow) video filter without having increased the wait time.
It's counter-intuitive, but that can result in big spikes when the PDM inverts.

Sam W.

--- In spectrumanalyzer@yahoogroups.com, "Geoff Moore" <m0ore@...> wrote:
>
> Neal,
>
> I am getting similar  but much worse results on my phase calibration
> display.
>
> I was waiting until I had fully checked my build and found a way of
> transferring the bmp file from the laptop ( with no internet access) to the
> main PC so that I could post a similar message to yours.
>
> I suspected that it may have been caused by the initial calibration of
> magnitude when the phase SLIM was not connected and I didn't disable the VNA
> facility so giving false phase calibrations. I have since deleted all cal
> files and re-loaded software but problem remains.
>
> Changing the lenth of cable shifts the deviations so I don't think it is
> software.
>
> Geoff
>
> ----- Original Message -----
> From: "nealmartini" <nealmartini@...>
> To: <spectrumanalyzer@yahoogroups.com>
> Sent: Monday, December 14, 2009 7:11 PM
> Subject: [spectrumanalyzer] Phase Detector Cal Question
>
>
> I am down to the cal of the Phase Detector (VNA only) and am having a
> problem. There are discontinuities in the phase plot using the 2 foot length
> of cable between the TG and MSA input. I included the .bmp file in the
> "Neal's Album" section of the group photo page
>
>
http://groups.yahoo.com/group/spectrumanalyzer/photos/album/995283679/pic/671608\
533/view?picmode=&mode=tn&order=ordinal&start=1&count=20&dir=asc
>
> Looking at the plot you will see the discontinuities. When I performed the
> subsequent "PDM Inversion Cal" the "Current Inversion Cal" calculated was
> 193.41 degrees. This not 180 plus/minus 5 degrees that the cal procedure
> says I should get.
>
> I also bypassed the final filter to eliminate any funny contributions from
> it, but the discontinuities were still there.
>
> Any suggestions?
>
> Thanks
> Neal
>

Those discontinuities are definitely the result of the PDM inversion, and should
go away when you have calibrated the inversion value. The tip-off is that when
you haven't done a line cal they occur at 72 and -108 degrees.

I think "180 +/- 5 degrees" was a guess, based on a couple of builds. Mine is
more like 195 degrees, but after PDM calibration it works well.

Other than that the scan looks great. Tip: set the trace width to 2 and you'll
get much nicer images when you copy them.

The next version of the software has a more automated procedure for calibrating
the PDM, so if you get it close now it will be easy to fine tune it.

Sam W.

--- In spectrumanalyzer@yahoogroups.com, "nealmartini" <nealmartini@...> wrote:
>
> I am down to the cal of the Phase Detector (VNA only) and am having a problem.
There are discontinuities in the phase plot using the 2 foot length of cable
between the TG and MSA input. I included the .bmp file in the "Neal's Album"
section of the group photo page
>
>
http://groups.yahoo.com/group/spectrumanalyzer/photos/album/995283679/pic/671608\
533/view?picmode=&mode=tn&order=ordinal&start=1&count=20&dir=asc
>
> Looking at the plot you will see the discontinuities. When I performed the
subsequent "PDM Inversion Cal" the "Current Inversion Cal" calculated was 193.41
degrees. This not 180 plus/minus 5 degrees that the cal procedure says I should
get.
>
> I also bypassed the final filter to eliminate any funny contributions from it,
but the discontinuities were still there.
>
> Any suggestions?
>
> Thanks
> Neal
>

I replied to your message, but my reply doesn't seem to have shown up, maybe it
is delayed for some reason.

The fact that with no line cal your discontinuities appear at 72 and -108
degrees (i.e., moving from the left, they trigger at those points) indicates
they are definitely the result of the PDM inversion differing from the stated
PDM inversion value. 180 +/- 5 degrees was a guess based on a couple of builds.
Mine is about 195 degrees and works fine. If you enter various values in the PDM
inversion box, you should see the magnitude of the discontinuities change (you
may have to Restart to do a new sweep to get it to change.)

When you have the correct PDM inversion value, the discontinuities will
disappear forever.

Sam W.

--- In spectrumanalyzer@yahoogroups.com, "nealmartini" <nealmartini@...> wrote:
>
> I am down to the cal of the Phase Detector (VNA only) and am having a problem.
There are discontinuities in the phase plot using the 2 foot length of cable
between the TG and MSA input. I included the .bmp file in the "Neal's Album"
section of the group photo page
>
>
http://groups.yahoo.com/group/spectrumanalyzer/photos/album/995283679/pic/671608\
533/view?picmode=&mode=tn&order=ordinal&start=1&count=20&dir=asc
>
> Looking at the plot you will see the discontinuities. When I performed the
subsequent "PDM Inversion Cal" the "Current Inversion Cal" calculated was 193.41
degrees. This not 180 plus/minus 5 degrees that the cal procedure says I should
get.
>
> I also bypassed the final filter to eliminate any funny contributions from it,
but the discontinuities were still there.
>
> Any suggestions?
>
> Thanks
> Neal
>

Neal,

I am getting similar  but much worse results on my phase calibration
display.

I was waiting until I had fully checked my build and found a way of
transferring the bmp file from the laptop ( with no internet access) to the
main PC so that I could post a similar message to yours.

I suspected that it may have been caused by the initial calibration of
magnitude when the phase SLIM was not connected and I didn't disable the VNA
facility so giving false phase calibrations. I have since deleted all cal
files and re-loaded software but problem remains.

Changing the lenth of cable shifts the deviations so I don't think it is
software.

Geoff

----- Original Message -----
From: "nealmartini" <nealmartini@...>
To: <spectrumanalyzer@yahoogroups.com>
Sent: Monday, December 14, 2009 7:11 PM
Subject: [spectrumanalyzer] Phase Detector Cal Question


I am down to the cal of the Phase Detector (VNA only) and am having a
problem. There are discontinuities in the phase plot using the 2 foot length
of cable between the TG and MSA input. I included the .bmp file in the
"Neal's Album" section of the group photo page

http://groups.yahoo.com/group/spectrumanalyzer/photos/album/995283679/pic/671608\
533/view?picmode=&mode=tn&order=ordinal&start=1&count=20&dir=asc

Looking at the plot you will see the discontinuities. When I performed the
subsequent "PDM Inversion Cal" the "Current Inversion Cal" calculated was
193.41 degrees. This not 180 plus/minus 5 degrees that the cal procedure
says I should get.

I also bypassed the final filter to eliminate any funny contributions from
it, but the discontinuities were still there.

Any suggestions?

Thanks
Neal

I am down to the cal of the Phase Detector (VNA only) and am having a problem.
There are discontinuities in the phase plot using the 2 foot length of cable
between the TG and MSA input. I included the .bmp file in the "Neal's Album"
section of the group photo page

http://groups.yahoo.com/group/spectrumanalyzer/photos/album/995283679/pic/671608\
533/view?picmode=&mode=tn&order=ordinal&start=1&count=20&dir=asc

Looking at the plot you will see the discontinuities. When I performed the
subsequent "PDM Inversion Cal" the "Current Inversion Cal" calculated was 193.41
degrees. This not 180 plus/minus 5 degrees that the cal procedure says I should
get.

I also bypassed the final filter to eliminate any funny contributions from it,
but the discontinuities were still there.

Any suggestions?

Thanks
Neal

Hi folks, Jerry has got in touch with me regarding payment for the Crystals. So
I can settle up. 73 Clive GW0PPO

--- In spectrumanalyzer@yahoogroups.com, "g0ppo" <clivejenner@...> wrote:
>
> My sets of filter crystals arrived the other day and I realised I need to pay
for them. Can someone set me straight as to how I go about settling my debt. I
would like to set things straight before the end of the year! On that note
seasons greetings to all and 73 Clive GW0PPO
>

My sets of filter crystals arrived the other day and I realised I need to pay
for them. Can someone set me straight as to how I go about settling my debt. I
would like to set things straight before the end of the year! On that note
seasons greetings to all and 73 Clive GW0PPO

Hi Neal,

Nice job. When I assembled mine, I had shields around the sides of each module,
but no tops. It affected low level stuff like spurs, but there were no major
feedback/oscillation issues. You carried it a step further, without any fencing,
and got the basic functionality without those catastrophic effects. That's great
news, that things may not be optimal but will at least be functional without the
fencing.

Glad to know you liked the software. I can assure you that the next version of
the software will be a lot of fun.

Sam W.

--- In spectrumanalyzer@yahoogroups.com, "nealmartini" <nealmartini@...> wrote:
>
> I finally completed assembling and testing all the SLIM modules for my
MSA/TG/VNA. All modules were tested seperately and work perfectly on their own.
Then I very crudely connected everything. I included a few pictures for those
interested in progress so far in the "Neal's Album" folder of the group photo
page:
>
> http://groups.yahoo.com/group/spectrumanalyzer/photos/album/995283679/pic/list
>
> The interconnection and packaging are both temporary. I just wanted to get it
all working together. I still need much cleaner module interconnects, shields
for each module, and a solid box to put it in. So far, I only have a very crude
final filter using two matched ECS-10.7-15B crystals. Not very selective, but it
works. I will begin working on the "Jerry supplied crystal" filters next.
>
> The thing I am amazed at is how well this thing is working with no calibration
and very unshielded modules. I am only beginning to get familiar with the
program interaction, but so far it is very easy and intuitive to use. The
graphics are very cool.
>
> Just wanted to share this exciting milestone!
>
> Neal
>

I finally completed assembling and testing all the SLIM modules for my
MSA/TG/VNA. All modules were tested seperately and work perfectly on their own.
Then I very crudely connected everything. I included a few pictures for those
interested in progress so far in the "Neal's Album" folder of the group photo
page:

http://groups.yahoo.com/group/spectrumanalyzer/photos/album/995283679/pic/list

The interconnection and packaging are both temporary. I just wanted to get it
all working together. I still need much cleaner module interconnects, shields
for each module, and a solid box to put it in. So far, I only have a very crude
final filter using two matched ECS-10.7-15B crystals. Not very selective, but it
works. I will begin working on the "Jerry supplied crystal" filters next.

The thing I am amazed at is how well this thing is working with no calibration
and very unshielded modules. I am only beginning to get familiar with the
program interaction, but so far it is very easy and intuitive to use. The
graphics are very cool.

Just wanted to share this exciting milestone!

Neal

I received my crystals and sent Jerry an email as he requested but have not
received any instructions back from him on how to pay him via PayPal. Did this
happen to anyone else?

Neal

Hi Sam,

Hmmm... good question - I can't quite remember now. Maybe the AD7685s were not
available with RS Components (India) when I was planning the build. More
probably I just decided that I did not need the extra accuracy and decided to
save a few bucks ;-)

Cheers,
Santhosh

--- In spectrumanalyzer@yahoogroups.com, "swetterlin" <swetterlin@...> wrote:
>
> Santosh,
>
> I'm curious as to why you are using the 12-bit ADC. It has plenty of
resolution for the SA, but when it comes to the VNA the extra resolution of a
16-bit ADC is a definite plus.
>
> Even though you will never get the MSA to have absolute accuracy of 0.01 dBm
(one reason being that you probably don't need that accuracy), I have been
amazed how many situations there are where it is important/useful to distinguish
relative measurements that differ by 0.01 dB or less. So the extra resolution of
the 16-bit ADC is nice to have.
>
> In any event, the new software will have the corrected default calibration
value for anyone using the 12-bit ADC.
>
> Sam W.
>
> --- In spectrumanalyzer@yahoogroups.com, "s_103_k_a" <s_103_k_a@> wrote:
> >
> > Hello Scotty,
> >
> > I tried your solution and it works. I was using SLIM-ADC-12.
> >
> > Thanks and Cheers,
> > Santhosh
> >
> > --- In spectrumanalyzer@yahoogroups.com, william sprowls <wsprowls@> wrote:
> > >
> > > Hello Santosh,
> > >   I assume you are using the SLIM-ADC-12.
> > > To keep from "hitting the roof", do this:
> > > Menu/Setup/Initial Cal Manager
> > > select the Path Calibration File (1)
> > > change the following from:
> > > *  ADC      dbm      Phase   in increasing order of ADC
> > >       0     -120.00     0.00
> > >    2047     0.00     0.00
> > >
> > > to :
> > > *  ADC      dbm      Phase   in increasing order of ADC
> > >       0      -120.00     0.00
> > >    4095     10.00     0.00
> > >
> > > 2047 was a bad estimate on my part. I didn't have one to verify that
number.
> > > During calibration, you will be changing those numbers, anyway.
> > >
> > > Scotty
> > >
> > > --- On Tue, 12/1/09, s_103_k_a <s_103_k_a@> wrote:
> > >
> > > From: s_103_k_a <s_103_k_a@>
> > > Subject: [spectrumanalyzer] Problem while tuning the Cavity & Resolution
filters
> > > To: spectrumanalyzer@yahoogroups.com
> > > Date: Tuesday, December 1, 2009, 10:02 PM
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >  
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >       Hi folks,
> > >
> > >
> > >
> > > I found that I had to bypass the IF Amp while tuning up the cavity filter
and the resolution filter on my SSA. Else the display would "hit the roof" at
around 1db and flatten out the top of the response curve. Has anyone else
encountered this behaviour?
> > >
> > >
> > >
> > > The unit is still uncalibrated so I'm guessing that that could be the
reason. The ref voltage for the ADC looks about correct (2.785V) and the front
end signal chain looks unsaturated since the log det output varies from 1.4 to
about 1.95V as I sweep within the saturated display region.
> > >
> > >
> > >
> > > Cheers,
> > >
> > > Santhosh
> > >
> >
>

Santosh,

I'm curious as to why you are using the 12-bit ADC. It has plenty of resolution
for the SA, but when it comes to the VNA the extra resolution of a 16-bit ADC is
a definite plus.

Even though you will never get the MSA to have absolute accuracy of 0.01 dBm
(one reason being that you probably don't need that accuracy), I have been
amazed how many situations there are where it is important/useful to distinguish
relative measurements that differ by 0.01 dB or less. So the extra resolution of
the 16-bit ADC is nice to have.

In any event, the new software will have the corrected default calibration value
for anyone using the 12-bit ADC.

Sam W.

--- In spectrumanalyzer@yahoogroups.com, "s_103_k_a" <s_103_k_a@...> wrote:
>
> Hello Scotty,
>
> I tried your solution and it works. I was using SLIM-ADC-12.
>
> Thanks and Cheers,
> Santhosh
>
> --- In spectrumanalyzer@yahoogroups.com, william sprowls <wsprowls@> wrote:
> >
> > Hello Santosh,
> >   I assume you are using the SLIM-ADC-12.
> > To keep from "hitting the roof", do this:
> > Menu/Setup/Initial Cal Manager
> > select the Path Calibration File (1)
> > change the following from:
> > *  ADC      dbm      Phase   in increasing order of ADC
> >       0     -120.00     0.00
> >    2047     0.00     0.00
> >
> > to :
> > *  ADC      dbm      Phase   in increasing order of ADC
> >       0      -120.00     0.00
> >    4095     10.00     0.00
> >
> > 2047 was a bad estimate on my part. I didn't have one to verify that number.
> > During calibration, you will be changing those numbers, anyway.
> >
> > Scotty
> >
> > --- On Tue, 12/1/09, s_103_k_a <s_103_k_a@> wrote:
> >
> > From: s_103_k_a <s_103_k_a@>
> > Subject: [spectrumanalyzer] Problem while tuning the Cavity & Resolution
filters
> > To: spectrumanalyzer@yahoogroups.com
> > Date: Tuesday, December 1, 2009, 10:02 PM
> >
> >
> >
> >
> >
> >
> >
> >  
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >       Hi folks,
> >
> >
> >
> > I found that I had to bypass the IF Amp while tuning up the cavity filter
and the resolution filter on my SSA. Else the display would "hit the roof" at
around 1db and flatten out the top of the response curve. Has anyone else
encountered this behaviour?
> >
> >
> >
> > The unit is still uncalibrated so I'm guessing that that could be the
reason. The ref voltage for the ADC looks about correct (2.785V) and the front
end signal chain looks unsaturated since the log det output varies from 1.4 to
about 1.95V as I sweep within the saturated display region.
> >
> >
> >
> > Cheers,
> >
> > Santhosh
> >
>

Hello Scotty,

I tried your solution and it works. I was using SLIM-ADC-12.

Thanks and Cheers,
Santhosh

--- In spectrumanalyzer@yahoogroups.com, william sprowls <wsprowls@...> wrote:
>
> Hello Santosh,
>   I assume you are using the SLIM-ADC-12.
> To keep from "hitting the roof", do this:
> Menu/Setup/Initial Cal Manager
> select the Path Calibration File (1)
> change the following from:
> *  ADC      dbm      Phase   in increasing order of ADC
>       0     -120.00     0.00
>    2047     0.00     0.00
>
> to :
> *  ADC      dbm      Phase   in increasing order of ADC
>       0      -120.00     0.00
>    4095     10.00     0.00
>
> 2047 was a bad estimate on my part. I didn't have one to verify that number.
> During calibration, you will be changing those numbers, anyway.
>
> Scotty
>
> --- On Tue, 12/1/09, s_103_k_a <s_103_k_a@...> wrote:
>
> From: s_103_k_a <s_103_k_a@...>
> Subject: [spectrumanalyzer] Problem while tuning the Cavity & Resolution
filters
> To: spectrumanalyzer@yahoogroups.com
> Date: Tuesday, December 1, 2009, 10:02 PM
>
>
>
>
>
>
>
>  
>
>
>
>
>
>
>
>
>
>       Hi folks,
>
>
>
> I found that I had to bypass the IF Amp while tuning up the cavity filter and
the resolution filter on my SSA. Else the display would "hit the roof" at around
1db and flatten out the top of the response curve. Has anyone else encountered
this behaviour?
>
>
>
> The unit is still uncalibrated so I'm guessing that that could be the reason.
The ref voltage for the ADC looks about correct (2.785V) and the front end
signal chain looks unsaturated since the log det output varies from 1.4 to about
1.95V as I sweep within the saturated display region.
>
>
>
> Cheers,
>
> Santhosh
>

Scotty,

You have somewhat confirmed what I was looking for. If my tests all showed Rm at
~25 ohms and everyone else was seeing ~4 ohms I would question if my fixture,
VNA or methods were faulty. I am trying to gain some additional confidence in my
test ability. If I am reasonably sure I can get the right characteristics then I
may be reasonably sure when I build some crystal filters that they may turn out
as expected.

My next step is to plug some numbers into a crystal filter program and see what
it looks like, then build a couple and see how these perform.

While it is interesting building the SA boards, I am fascinated by the design
process and technology behind it.

Regards

--- In spectrumanalyzer@yahoogroups.com, "wsprowls" <wsprowls@...> wrote:
>
> Hi All,
>   I should reiterate that half the crystals were matched by me on the MSA and
the other half on the N2PK VNA by Jerry. You may get mixed sets of crystals. Our
results were confirmed to be within one ohm of each other, which may sound a bit
high.  However, each set of 5 crystals was matched on the same machine, which
means any set will have 5 crystals within 2 ohms of each other.
>   All shipped sets have Rm measured to be less than 18 ohms but there were a
few sets delivered that were between 8 and 10 ohms.  If you got one of these,
you are not a "Teacher's Pet", you just got lucky.  Personally, I wanted to save
those and sell them for "big bucks", but Jerry said NO.  He is just tooo darned
nice.
>
> If you measure one of the crystals on your "favorite" test fixture and measure
Rm = 12.3 ohms, that doesn't necessarily mean that I (or Jerry) measured it to
be 12.3 ohms.  I suggest our 3 differences would have a measurement spred of
about 1 ohm.  With that said, if you measure 12.3 ohms on your MSA, and your
neighbor measures the same crystal on his MSA as 12.3 ohms, I would be surprised
(and supremely pleased).  But, realistically, you should be within 1 ohm of each
other.
>   Oh, by the way, your neighbor's air conditioner must match yours. 
Temperature does make a difference.  Try this when measuring a crystal.  Let it
stabilize to the ambient air temperature, make a measurement, then warm it up a
few degrees by touching it.  Measure again.  See the difference?  SAW devices
are the worst. I can tell you horror stories about "moving" SAW filters.
> I love this stuff.
> Scotty
>
> --- In spectrumanalyzer@yahoogroups.com, "swetterlin" <swetterlin@> wrote:
> >
> > I wonder if there is a way to track your set of crystals to see if it is one
tested by Scotty on the MSA, to compare results.
> >
> > I tested some other crystals using the MSA, using a couple of different
approaches, and got very similar results each time. On the AADE web site, there
is a filter program with a help file that has interesting test results from
several different testing methods with professional equipment. There was a
remarkable amount of variation, especially in Rm. No single method seemed to be
the clear winner, but the -3 dB method seemed to do very well. That's the method
I programmed into the new MSA software. A similar method looks for 45 degree
phase points rather than -3 dB, but didn't seem to have any advantage. Given
that the phase method had no clear advantage, I wanted to use a method that
would work for someone who had the SA+TG, but not the full VNA.
> >
> > I suppose the bottom line is that Scotty tested crystals with the MSA and
used the results to design and build filters that perform very well. The proof
is in the pudding. Plus, it is fun to use the MSA to design itself.
> >
> > Sam W.
> >
> >
> > --- In spectrumanalyzer@yahoogroups.com, "dr_z_lab" <dr_z@> wrote:
> > >
> > > Team,
> > >
> > > I received some of the matched 10Mhz crystals so I thought I would do some
experimenting with a modified version of the pi series fixture I built for my HP
4915A and these crystals.
> > >
> > > The fixture is essentially a power splitter with the pi series fixture in
the T leg and an attenuator in the R leg. It is set up this way so that I can
attach it to the front of the 4915A and test in transmission mode for the -3dB
bandwidth method and test in the equivalent circuit parameter calc mode without
removing the fixture. I was both curious what the motion parameters were for the
crystals and if I could confirm that the fixture would work in both testing
modes. I don't have an HP 49151A impedence test kit ($$$$) so I assume if both
test methods produce the same results I could confirm that the fixture could be
used in place of the 49151A for crystals.
> > > I used a shorting jumper for normalization for the through testing and the
OSL cal for the Eq circuit test.
> > >
> > > Here are my results for one of the crystals I tested:
> > > Center freq = 10.110975 Mhz
> > >
> > > -3dB METHOD            Equivalent Circuit Method
> > >
> > > -3dB BW = 279.5 Hz
> > > Loss dB = 3.3582 dB
> > > Q = 36173.54
> > > Rm = 11.99 ohm            Rm = 12.23 ohm
> > > Lm = 21.289 mH            Lm = 20.985 mH
> > > Cm = 11.64 fF             Cm = 11.80 fF
> > > C0 not measured           C0 = 3.8 pF
> > >
> > > The methods provided very close results. The span settings were a bit
different, I found that the pi loads were higher than expected (about 12.7 ohms
each measured with the fixture attached to the network analyzer)so I can
attribute some variance to these factors. I may need to tune the loads a bit
better to help tune out the variance.
> > >
> > > I think I have confirmed that the fixture works so I will try it with the
SA (Scotty's) that I am building and see if I get the same results. I still have
a ways to go in finishing it.
> > >
> > > I wanted to pass along this test info and ask the team if anyone else has
characterized any of the crystals sent out from the Poll. I would like to know
if these figures are reasonably close to others gathered from the team.
> > >
> > > If anyone is interested, I created a simple spreadsheet that takes the
center freq, -3db BW and loss, and produces the motion parameters scaled to the
proper decimal places. I will post if there is any interest.
> > >
> > > I took the calculations from the K8ZOA Crystal Test write up and found my
testing results are similar to his. I don't have a "standard" crystal so even
though the testing methods support each other, the actual results could be off.
Other testing results from the team would help assure me that my measurements
are accurate.
> > >
> > > Regards
> > >
> > >
> > > --- In spectrumanalyzer@yahoogroups.com, "swetterlin" <swetterlin@> wrote:
> > > >
> > > >
> > > > His fixture is what is called a "series fixture" in the MSA software,
with pi-attenuators at the input and output, and the crystal in series between
the two attenuators. The attenuators present 50 ohms to the outside world and
12.5 ohms to the crystal. The alternative is the "shunt fixture" in which the
two attenuators are directly connected, with the DUT shunted to ground from that
connecting point.
> > > >
> > > > I have built and tested a number of these. I believe Scotty used a
series fixture, but one that presented 50 ohms to the crystal, and he got very
good results with it.
> > > >
> > > > I have found that if the on-board attenuators are built with 0.1%
resistors (and why not? Panasonic now sells them for 20 cents each), accurate
measurements can be made without the full OSL calibration typical of VNAs. At
low frequencies (below 60 MHz) you can get amazingly good results with a fairly
crude fixture.
> > > >
> > > > The new MSA software has a crystal measurement function which calibrates
with a Short (brass strip with leads), then measures the crystal parameters
(frequency, motional parameters and package capacitance). Since you normally
don't test just one, it also compiles the results into a list.
> > > >
> > > > Using the series fixture with that simple calibration, I also measured
(using the MSA Component Meter function) some capacitors whose values I know
very precisely (thanks to tests by Larry Phillips and Jeroen Bastemeijer). The
measurements were accurate within 1% (often better), except the smallest value
(1.6 pF) was off by 1.3% and the largest (0.25 uF) was off about 3%. [The series
fixture is not ideal for impedances below a few ohms--that is for the shunt
fixture.] Resistor measurements have been more accurate than that.
> > > >
> > > > There are many ways to arrange a series or shunt fixture physically,
depending what will be attached to it. I built one with small silver bars
attached (little pieces of silver are cheap on eBay); they can be pressed
against SMT components. I am about to order a board from ExpressPCB that is a
collection of different fixture designs. We'll see how they work.
> > > >
> > > > Sam W.
> > > >
> > > > --- In spectrumanalyzer@yahoogroups.com, "jghbeta" <jghalpha@> wrote:
> > > > >
> > > > > For those interested in the subject, Clifton Laboratories (Jack Smith,
K8ZOA) has a motional parameter measuring kit and interesting documention (See
www.cliftonlaboratories.com)
> > > > > Jim, W1JGH
> > > > >
> > > >
> > >
> >
>

Hi All,
   I should reiterate that half the crystals were matched by me on the MSA and
the other half on the N2PK VNA by Jerry. You may get mixed sets of crystals. Our
results were confirmed to be within one ohm of each other, which may sound a bit
high.  However, each set of 5 crystals was matched on the same machine, which
means any set will have 5 crystals within 2 ohms of each other.
   All shipped sets have Rm measured to be less than 18 ohms but there were a few
sets delivered that were between 8 and 10 ohms.  If you got one of these, you
are not a "Teacher's Pet", you just got lucky.  Personally, I wanted to save
those and sell them for "big bucks", but Jerry said NO.  He is just tooo darned
nice.

If you measure one of the crystals on your "favorite" test fixture and measure
Rm = 12.3 ohms, that doesn't necessarily mean that I (or Jerry) measured it to
be 12.3 ohms.  I suggest our 3 differences would have a measurement spred of
about 1 ohm.  With that said, if you measure 12.3 ohms on your MSA, and your
neighbor measures the same crystal on his MSA as 12.3 ohms, I would be surprised
(and supremely pleased).  But, realistically, you should be within 1 ohm of each
other.
   Oh, by the way, your neighbor's air conditioner must match yours.  Temperature
does make a difference.  Try this when measuring a crystal.  Let it stabilize to
the ambient air temperature, make a measurement, then warm it up a few degrees
by touching it.  Measure again.  See the difference?  SAW devices are the worst.
I can tell you horror stories about "moving" SAW filters.
I love this stuff.
Scotty

--- In spectrumanalyzer@yahoogroups.com, "swetterlin" <swetterlin@...> wrote:
>
> I wonder if there is a way to track your set of crystals to see if it is one
tested by Scotty on the MSA, to compare results.
>
> I tested some other crystals using the MSA, using a couple of different
approaches, and got very similar results each time. On the AADE web site, there
is a filter program with a help file that has interesting test results from
several different testing methods with professional equipment. There was a
remarkable amount of variation, especially in Rm. No single method seemed to be
the clear winner, but the -3 dB method seemed to do very well. That's the method
I programmed into the new MSA software. A similar method looks for 45 degree
phase points rather than -3 dB, but didn't seem to have any advantage. Given
that the phase method had no clear advantage, I wanted to use a method that
would work for someone who had the SA+TG, but not the full VNA.
>
> I suppose the bottom line is that Scotty tested crystals with the MSA and used
the results to design and build filters that perform very well. The proof is in
the pudding. Plus, it is fun to use the MSA to design itself.
>
> Sam W.
>
>
> --- In spectrumanalyzer@yahoogroups.com, "dr_z_lab" <dr_z@> wrote:
> >
> > Team,
> >
> > I received some of the matched 10Mhz crystals so I thought I would do some
experimenting with a modified version of the pi series fixture I built for my HP
4915A and these crystals.
> >
> > The fixture is essentially a power splitter with the pi series fixture in
the T leg and an attenuator in the R leg. It is set up this way so that I can
attach it to the front of the 4915A and test in transmission mode for the -3dB
bandwidth method and test in the equivalent circuit parameter calc mode without
removing the fixture. I was both curious what the motion parameters were for the
crystals and if I could confirm that the fixture would work in both testing
modes. I don't have an HP 49151A impedence test kit ($$$$) so I assume if both
test methods produce the same results I could confirm that the fixture could be
used in place of the 49151A for crystals.
> > I used a shorting jumper for normalization for the through testing and the
OSL cal for the Eq circuit test.
> >
> > Here are my results for one of the crystals I tested:
> > Center freq = 10.110975 Mhz
> >
> > -3dB METHOD            Equivalent Circuit Method
> >
> > -3dB BW = 279.5 Hz
> > Loss dB = 3.3582 dB
> > Q = 36173.54
> > Rm = 11.99 ohm            Rm = 12.23 ohm
> > Lm = 21.289 mH            Lm = 20.985 mH
> > Cm = 11.64 fF             Cm = 11.80 fF
> > C0 not measured           C0 = 3.8 pF
> >
> > The methods provided very close results. The span settings were a bit
different, I found that the pi loads were higher than expected (about 12.7 ohms
each measured with the fixture attached to the network analyzer)so I can
attribute some variance to these factors. I may need to tune the loads a bit
better to help tune out the variance.
> >
> > I think I have confirmed that the fixture works so I will try it with the SA
(Scotty's) that I am building and see if I get the same results. I still have a
ways to go in finishing it.
> >
> > I wanted to pass along this test info and ask the team if anyone else has
characterized any of the crystals sent out from the Poll. I would like to know
if these figures are reasonably close to others gathered from the team.
> >
> > If anyone is interested, I created a simple spreadsheet that takes the
center freq, -3db BW and loss, and produces the motion parameters scaled to the
proper decimal places. I will post if there is any interest.
> >
> > I took the calculations from the K8ZOA Crystal Test write up and found my
testing results are similar to his. I don't have a "standard" crystal so even
though the testing methods support each other, the actual results could be off.
Other testing results from the team would help assure me that my measurements
are accurate.
> >
> > Regards
> >
> >
> > --- In spectrumanalyzer@yahoogroups.com, "swetterlin" <swetterlin@> wrote:
> > >
> > >
> > > His fixture is what is called a "series fixture" in the MSA software, with
pi-attenuators at the input and output, and the crystal in series between the
two attenuators. The attenuators present 50 ohms to the outside world and 12.5
ohms to the crystal. The alternative is the "shunt fixture" in which the two
attenuators are directly connected, with the DUT shunted to ground from that
connecting point.
> > >
> > > I have built and tested a number of these. I believe Scotty used a series
fixture, but one that presented 50 ohms to the crystal, and he got very good
results with it.
> > >
> > > I have found that if the on-board attenuators are built with 0.1%
resistors (and why not? Panasonic now sells them for 20 cents each), accurate
measurements can be made without the full OSL calibration typical of VNAs. At
low frequencies (below 60 MHz) you can get amazingly good results with a fairly
crude fixture.
> > >
> > > The new MSA software has a crystal measurement function which calibrates
with a Short (brass strip with leads), then measures the crystal parameters
(frequency, motional parameters and package capacitance). Since you normally
don't test just one, it also compiles the results into a list.
> > >
> > > Using the series fixture with that simple calibration, I also measured
(using the MSA Component Meter function) some capacitors whose values I know
very precisely (thanks to tests by Larry Phillips and Jeroen Bastemeijer). The
measurements were accurate within 1% (often better), except the smallest value
(1.6 pF) was off by 1.3% and the largest (0.25 uF) was off about 3%. [The series
fixture is not ideal for impedances below a few ohms--that is for the shunt
fixture.] Resistor measurements have been more accurate than that.
> > >
> > > There are many ways to arrange a series or shunt fixture physically,
depending what will be attached to it. I built one with small silver bars
attached (little pieces of silver are cheap on eBay); they can be pressed
against SMT components. I am about to order a board from ExpressPCB that is a
collection of different fixture designs. We'll see how they work.
> > >
> > > Sam W.
> > >
> > > --- In spectrumanalyzer@yahoogroups.com, "jghbeta" <jghalpha@> wrote:
> > > >
> > > > For those interested in the subject, Clifton Laboratories (Jack Smith,
K8ZOA) has a motional parameter measuring kit and interesting documention (See
www.cliftonlaboratories.com)
> > > > Jim, W1JGH
> > > >
> > >
> >
>

I wonder if there is a way to track your set of crystals to see if it is one
tested by Scotty on the MSA, to compare results.

I tested some other crystals using the MSA, using a couple of different
approaches, and got very similar results each time. On the AADE web site, there
is a filter program with a help file that has interesting test results from
several different testing methods with professional equipment. There was a
remarkable amount of variation, especially in Rm. No single method seemed to be
the clear winner, but the -3 dB method seemed to do very well. That's the method
I programmed into the new MSA software. A similar method looks for 45 degree
phase points rather than -3 dB, but didn't seem to have any advantage. Given
that the phase method had no clear advantage, I wanted to use a method that
would work for someone who had the SA+TG, but not the full VNA.

I suppose the bottom line is that Scotty tested crystals with the MSA and used
the results to design and build filters that perform very well. The proof is in
the pudding. Plus, it is fun to use the MSA to design itself.

Sam W.


--- In spectrumanalyzer@yahoogroups.com, "dr_z_lab" <dr_z@...> wrote:
>
> Team,
>
> I received some of the matched 10Mhz crystals so I thought I would do some
experimenting with a modified version of the pi series fixture I built for my HP
4915A and these crystals.
>
> The fixture is essentially a power splitter with the pi series fixture in the
T leg and an attenuator in the R leg. It is set up this way so that I can attach
it to the front of the 4915A and test in transmission mode for the -3dB
bandwidth method and test in the equivalent circuit parameter calc mode without
removing the fixture. I was both curious what the motion parameters were for the
crystals and if I could confirm that the fixture would work in both testing
modes. I don't have an HP 49151A impedence test kit ($$$$) so I assume if both
test methods produce the same results I could confirm that the fixture could be
used in place of the 49151A for crystals.
> I used a shorting jumper for normalization for the through testing and the OSL
cal for the Eq circuit test.
>
> Here are my results for one of the crystals I tested:
> Center freq = 10.110975 Mhz
>
> -3dB METHOD            Equivalent Circuit Method
>
> -3dB BW = 279.5 Hz
> Loss dB = 3.3582 dB
> Q = 36173.54
> Rm = 11.99 ohm            Rm = 12.23 ohm
> Lm = 21.289 mH            Lm = 20.985 mH
> Cm = 11.64 fF             Cm = 11.80 fF
> C0 not measured           C0 = 3.8 pF
>
> The methods provided very close results. The span settings were a bit
different, I found that the pi loads were higher than expected (about 12.7 ohms
each measured with the fixture attached to the network analyzer)so I can
attribute some variance to these factors. I may need to tune the loads a bit
better to help tune out the variance.
>
> I think I have confirmed that the fixture works so I will try it with the SA
(Scotty's) that I am building and see if I get the same results. I still have a
ways to go in finishing it.
>
> I wanted to pass along this test info and ask the team if anyone else has
characterized any of the crystals sent out from the Poll. I would like to know
if these figures are reasonably close to others gathered from the team.
>
> If anyone is interested, I created a simple spreadsheet that takes the center
freq, -3db BW and loss, and produces the motion parameters scaled to the proper
decimal places. I will post if there is any interest.
>
> I took the calculations from the K8ZOA Crystal Test write up and found my
testing results are similar to his. I don't have a "standard" crystal so even
though the testing methods support each other, the actual results could be off.
Other testing results from the team would help assure me that my measurements
are accurate.
>
> Regards
>
>
> --- In spectrumanalyzer@yahoogroups.com, "swetterlin" <swetterlin@> wrote:
> >
> >
> > His fixture is what is called a "series fixture" in the MSA software, with
pi-attenuators at the input and output, and the crystal in series between the
two attenuators. The attenuators present 50 ohms to the outside world and 12.5
ohms to the crystal. The alternative is the "shunt fixture" in which the two
attenuators are directly connected, with the DUT shunted to ground from that
connecting point.
> >
> > I have built and tested a number of these. I believe Scotty used a series
fixture, but one that presented 50 ohms to the crystal, and he got very good
results with it.
> >
> > I have found that if the on-board attenuators are built with 0.1% resistors
(and why not? Panasonic now sells them for 20 cents each), accurate measurements
can be made without the full OSL calibration typical of VNAs. At low frequencies
(below 60 MHz) you can get amazingly good results with a fairly crude fixture.
> >
> > The new MSA software has a crystal measurement function which calibrates
with a Short (brass strip with leads), then measures the crystal parameters
(frequency, motional parameters and package capacitance). Since you normally
don't test just one, it also compiles the results into a list.
> >
> > Using the series fixture with that simple calibration, I also measured
(using the MSA Component Meter function) some capacitors whose values I know
very precisely (thanks to tests by Larry Phillips and Jeroen Bastemeijer). The
measurements were accurate within 1% (often better), except the smallest value
(1.6 pF) was off by 1.3% and the largest (0.25 uF) was off about 3%. [The series
fixture is not ideal for impedances below a few ohms--that is for the shunt
fixture.] Resistor measurements have been more accurate than that.
> >
> > There are many ways to arrange a series or shunt fixture physically,
depending what will be attached to it. I built one with small silver bars
attached (little pieces of silver are cheap on eBay); they can be pressed
against SMT components. I am about to order a board from ExpressPCB that is a
collection of different fixture designs. We'll see how they work.
> >
> > Sam W.
> >
> > --- In spectrumanalyzer@yahoogroups.com, "jghbeta" <jghalpha@> wrote:
> > >
> > > For those interested in the subject, Clifton Laboratories (Jack Smith,
K8ZOA) has a motional parameter measuring kit and interesting documention (See
www.cliftonlaboratories.com)
> > > Jim, W1JGH
> > >
> >
>

Team,

I received some of the matched 10Mhz crystals so I thought I would do some
experimenting with a modified version of the pi series fixture I built for my HP
4915A and these crystals.

The fixture is essentially a power splitter with the pi series fixture in the T
leg and an attenuator in the R leg. It is set up this way so that I can attach
it to the front of the 4915A and test in transmission mode for the -3dB
bandwidth method and test in the equivalent circuit parameter calc mode without
removing the fixture. I was both curious what the motion parameters were for the
crystals and if I could confirm that the fixture would work in both testing
modes. I don't have an HP 49151A impedence test kit ($$$$) so I assume if both
test methods produce the same results I could confirm that the fixture could be
used in place of the 49151A for crystals.
I used a shorting jumper for normalization for the through testing and the OSL
cal for the Eq circuit test.

Here are my results for one of the crystals I tested:
Center freq = 10.110975 Mhz

-3dB METHOD            Equivalent Circuit Method

-3dB BW = 279.5 Hz
Loss dB = 3.3582 dB
Q = 36173.54
Rm = 11.99 ohm            Rm = 12.23 ohm
Lm = 21.289 mH            Lm = 20.985 mH
Cm = 11.64 fF             Cm = 11.80 fF
C0 not measured           C0 = 3.8 pF

The methods provided very close results. The span settings were a bit different,
I found that the pi loads were higher than expected (about 12.7 ohms each
measured with the fixture attached to the network analyzer)so I can attribute
some variance to these factors. I may need to tune the loads a bit better to
help tune out the variance.

I think I have confirmed that the fixture works so I will try it with the SA
(Scotty's) that I am building and see if I get the same results. I still have a
ways to go in finishing it.

I wanted to pass along this test info and ask the team if anyone else has
characterized any of the crystals sent out from the Poll. I would like to know
if these figures are reasonably close to others gathered from the team.

If anyone is interested, I created a simple spreadsheet that takes the center
freq, -3db BW and loss, and produces the motion parameters scaled to the proper
decimal places. I will post if there is any interest.

I took the calculations from the K8ZOA Crystal Test write up and found my
testing results are similar to his. I don't have a "standard" crystal so even
though the testing methods support each other, the actual results could be off.
Other testing results from the team would help assure me that my measurements
are accurate.

Regards


--- In spectrumanalyzer@yahoogroups.com, "swetterlin" <swetterlin@...> wrote:
>
>
> His fixture is what is called a "series fixture" in the MSA software, with
pi-attenuators at the input and output, and the crystal in series between the
two attenuators. The attenuators present 50 ohms to the outside world and 12.5
ohms to the crystal. The alternative is the "shunt fixture" in which the two
attenuators are directly connected, with the DUT shunted to ground from that
connecting point.
>
> I have built and tested a number of these. I believe Scotty used a series
fixture, but one that presented 50 ohms to the crystal, and he got very good
results with it.
>
> I have found that if the on-board attenuators are built with 0.1% resistors
(and why not? Panasonic now sells them for 20 cents each), accurate measurements
can be made without the full OSL calibration typical of VNAs. At low frequencies
(below 60 MHz) you can get amazingly good results with a fairly crude fixture.
>
> The new MSA software has a crystal measurement function which calibrates with
a Short (brass strip with leads), then measures the crystal parameters
(frequency, motional parameters and package capacitance). Since you normally
don't test just one, it also compiles the results into a list.
>
> Using the series fixture with that simple calibration, I also measured (using
the MSA Component Meter function) some capacitors whose values I know very
precisely (thanks to tests by Larry Phillips and Jeroen Bastemeijer). The
measurements were accurate within 1% (often better), except the smallest value
(1.6 pF) was off by 1.3% and the largest (0.25 uF) was off about 3%. [The series
fixture is not ideal for impedances below a few ohms--that is for the shunt
fixture.] Resistor measurements have been more accurate than that.
>
> There are many ways to arrange a series or shunt fixture physically, depending
what will be attached to it. I built one with small silver bars attached (little
pieces of silver are cheap on eBay); they can be pressed against SMT components.
I am about to order a board from ExpressPCB that is a collection of different
fixture designs. We'll see how they work.
>
> Sam W.
>
> --- In spectrumanalyzer@yahoogroups.com, "jghbeta" <jghalpha@> wrote:
> >
> > For those interested in the subject, Clifton Laboratories (Jack Smith,
K8ZOA) has a motional parameter measuring kit and interesting documention (See
www.cliftonlaboratories.com)
> > Jim, W1JGH
> >
>

Hi folks,

I found that I had to bypass the IF Amp while tuning up the cavity filter and
the resolution filter on my SSA. Else the display would "hit the roof" at around
1db and flatten out the top of the response curve. Has anyone else encountered
this behaviour?

The unit is still uncalibrated so I'm guessing that that could be the reason.
The ref voltage for the ADC looks about correct (2.785V) and the front end
signal chain looks unsaturated since the log det output varies from 1.4 to about
1.95V as I sweep within the saturated display region.

Cheers,
Santhosh

See Message 5232.

--- In spectrumanalyzer@yahoogroups.com, Mike - WB8ICN <wb8icn@...> wrote:
>
> Jerry,
>
> Just got home from visiting kids and grandkids, the mailer with xtals
> had arrived while we were gone. Thank you!!!
>
> What is your PayPal address I so can send the money?
>
> 73's....Mikey, WB8ICN
>

Jerry,

Just got home from visiting kids and grandkids, the mailer with xtals
had arrived while we were gone. Thank you!!!

What is your PayPal address I so can send the money?

73's....Mikey, WB8ICN

Some of the sets of crystals are now arriving, and I am getting inquiries about
how to pay, and how much.  $4 for inside the U.S.  $5 for all other countries. 
This is for all 4 sets.
To pay, go to the last poll (which is hidden from non-members) and send an email
to me, using my email address which Scotty put in his poll.
I will then reply with my PayPal information.
Jerry

Dave, I have previously read and saved your invaluable guides found through the
N2PK group.  I was able to use an older XP laptop, with no registry modification
or additional drivers, for VNA4WIN. This solved my short-term situation.  My
intention is to build a standalone lab pc for the N2PK VNA, Scotty's analyzer,
and other lab functions.
Murphy, however, has other ideas for now.  My main pc has problems, and my
grandkids pc is dead, rearranging my priorities.
Jerry

The only noise issue I have come across on the parallel interface is not noise
per se but a windows issue; specifically the fact that windows, when it sees
activity on the parallel port tries to determine if a printer is attached, so it
interferes with the activity on the port causing glitches. I believe there was
an earlier posting on this in this group; certainly there was in the N2PK group.
A solution for this is contained within the myVNA manual (an annex) and the
files necessary to modify the registry may be found within the N2PK VNA files
area, reproduced in the myVNA documentation and included in its installer.

The reason for noting this in this group is that it can also affect other
applications that use the parallel port for communicating with custom hardware.

Dave

--- In spectrumanalyzer@yahoogroups.com, "R Wall" <maillist@...> wrote:
>
> Hi Jerry,
>
> myVNA also has parallel interface as well as USB interface. But maybe your
parallel port was too noisy?
>
> Anyhow,...... thanks for testing the crystals.
>
> Roderick.
>
>
>   ----- Original Message -----
>   From: undercoupled
>   To: spectrumanalyzer@yahoogroups.com
>   Sent: Thursday, November 26, 2009 1:31 PM
>   Subject: [spectrumanalyzer] Re: Crystal motion parameters
>
>
>
>   Murphy's law had a lot to do with my crystal testing. My dedicated clunker
laptop was Waay too slow. A desktop box I tried to use had a very noisy parallel
port output. I do not yet have a usb interface for the VNA. I had some
unresolved issues with other software I tried to use, and VNA4WIN worked on the
pc available. With a family project that had to be finished, a crystal test
fixture to build, and lots of crystals to test, I used what worked.
>   Dave, I intend to use your myVNA with my as yet unbuilt usb adapter
>   from WB6DHW on a dedicated lab pc. Sure will make measurement easier.
>   Jerry
>
>
>
>
>
>
> ------------------------------------------------------------------------------
>
>
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----- Original Message -----

From: undercoupled

To: spectrumanalyzer@yahoogroups.com

Sent: Thursday, November 26, 2009 1:31 PM

Subject: [spectrumanalyzer] Re: Crystal motion parameters

 

Murphy's law had a lot to do with my crystal testing. My dedicated clunker laptop was Waay too slow. A desktop box I tried to use had a very noisy parallel port output. I do not yet have a usb interface for the VNA. I had some unresolved issues with other software I tried to use, and VNA4WIN worked on the pc available. With a family project that had to be finished, a crystal test fixture to build, and lots of crystals to test, I used what worked.
Dave, I intend to use your myVNA with my as yet unbuilt usb adapter
from WB6DHW on a dedicated lab pc. Sure will make measurement easier.
Jerry

---

No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 9.0.709 / Virus Database: 270.14.83/2526 - Release Date: 11/26/09 06:43:00

Murphy's law had a lot to do with my crystal testing.  My dedicated clunker
laptop was Waay too slow.  A desktop box I tried to use had a very noisy
parallel port output.  I do not yet have a usb interface for the VNA. I had some
unresolved issues with other software I tried to use, and VNA4WIN worked on the
pc available. With a family project that had to be finished, a crystal test
fixture to build, and lots of crystals to test, I used what worked.
Dave, I intend to use your myVNA with my as yet unbuilt usb adapter
from WB6DHW on a dedicated lab pc.  Sure will make measurement easier.
Jerry