Actgually, the first XOR gate is simply a squaring circuit. The negative feedback via the R/C simply biases the input to the on/off threshold of the gate. ...
1553
David Brainerd
brainerdd
Dec 2, 2005 3:32 am
It appears I was confused on how that (the QRP2001) circuit works. After looking at it on my scope, it does produce an approx. 50% duty cycle. The R-C...
1552
brainerd@...
brainerdd
Dec 2, 2005 3:19 am
The output of the XOR gate is definitely NOT at 50%. You get a short pulse on the the rising and falling edges of the input clock. The output is only used to...
1551
kd5nwa
Dec 2, 2005 2:48 am
I described a doubler and said that circuit is not one, but it's purpose is to insure 50% duty cycle on the clock. Then I proceeded to describe the rest of the...
1550
Philip Covington
phil_at_vhmi
Dec 2, 2005 2:38 am
Hi Phil, Good deal, sounds great! I am curious what sampling rate you were running the Wolfson chip at and whether your were doing both channels or just one...
1549
Bill Dumke
billspiro1
Dec 2, 2005 2:36 am
The only purpose of the XOR gate in question is to square up the clock signal to a 50% duty cycle so you don't need to have another divide by 2 flip-flop do...
1548
kd5nwa
Dec 2, 2005 2:16 am
A doubler is created when you feed the signal into one pin of a XOR and a delayed version into the other pin, then what it really does is to detect edges on...
1547
pvharman@...
pvharman
Dec 2, 2005 2:06 am
Fellow Xyloeans, Last night I managed to get audio from the Wolfson A/D, via the FPGA and FX2 over the USB2 at 480Mbps to the PC and out over PortAudio to the...
1546
Milt Cram
w8nue
Dec 2, 2005 2:03 am
windy10605@... wrote:
> Milt,
> > Ahhh, didn't know about any RC network and yes you are right, that > would create a doubler ....but Dave said the...
1545
windy10605@...
keestheham
Dec 2, 2005 1:51 am
Milt, Ahhh, didn't know about any RC network and yes you are right, that would create a doubler ....but Dave said the XOR was in place of the 1st FF. If you...
1544
Milt Cram
w8nue
Dec 2, 2005 1:14 am
... I stand corrected. Milt -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.362 / Virus Database: 267.13.10/189 - Release...
1543
Bill Dumke
billspiro1
Dec 2, 2005 1:03 am
It is not a doubler. It just squares up the duty cycle to 50 %, if you are talking about the QRP2001 circuit. See: ...
1542
Milt Cram
w8nue
Dec 2, 2005 12:47 am
windy10605@... wrote:
> OK !! it can be made to work OK. I notice the AD spec says 50% duty > cycle +/-10% but I've never seen what it actually is...
1541
Bill Dumke
billspiro1
Dec 2, 2005 12:28 am
Is the Exclusive OR to correct the duty cycle like with the QRP-2001? Bill WB5TCO...
1540
windy10605@...
keestheham
Dec 1, 2005 11:22 pm
OK !! it can be made to work OK. I notice the AD spec says 50% duty cycle +/-10% but I've never seen what it actually is across the frequency range. Some of...
1539
brainerd@...
brainerdd
Dec 1, 2005 10:46 pm
QST and QEX had an article a few years back on a power meter using the 8307. I built the one in QEX. Works really great. Calibrated digital readout up to...
1538
brainerd@...
brainerdd
Dec 1, 2005 10:36 pm
I have a Tayloe Detector board that uses an exclusice OR in place of the first FF. When fed with one output of the IQ VFO (a AD9854), works great with SDR...
1537
Mike WA8BXN
hubby2k
Dec 1, 2005 9:50 pm
A few thoughts --- Spurs may be a minor problem due to a much greater signal level being input to the SR-40. I would be concerned about stability of the analog...
1536
kd5nwa
Dec 1, 2005 9:22 pm
I want to run a couple more test and make sure I'm not missing something major in my simulation and then I'll post it. Basically, the comparators compare the...
1535
Michael Blake
K9JRI_PPC
Dec 1, 2005 8:44 pm
And even more importantly (to me) what about the QXE board. I am really anxious Tony :-) 73 - Mike - K9JRI "James E. Gutshall" <jeg@...> wrote: Does...
1534
windy10605@...
keestheham
Dec 1, 2005 7:25 pm
Interesting ! Care to give us some more detail ? 73 Kees K5BCQ ... From: KD5NWA <KD5NWA@...> To: softrock40@yahoogroups.com Date: Thu, 01 Dec 2005 12:53:48...
1533
kd5nwa
Dec 1, 2005 7:04 pm
I've been working on a different way of generating a Quadrature clock for the SR-5 without having to change components over a wide frequency range. So far on...
1532
David Willmore
davidwillmore
Dec 1, 2005 6:27 pm
Rahul, ... Well, then, order a DDS-60 for each of the DDS chips. For the 9850's, order up the LPF parts from the original DDS board and, while you're at it,...
1531
James E. Gutshall
n7vhf
Dec 1, 2005 6:21 pm
Does any one know the shipping status of the softrock 5.0 kits?...
1530
windy10605@...
keestheham
Dec 1, 2005 5:45 pm
Just thinking again............ Since the Rocky program compensates for and corrects phase and amplitude errors, has anyone tried to see if it's sufficient to...
1529
vu3wjm
Dec 1, 2005 2:30 pm
Hi! Try Kikad here too good for free http://www.lis.inpg.fr/realise_au_lis/kicad/index.html BTW I have received 9850,51 as well as 8307 from AD as samples....
1528
Alverson, Tom (Xetron)
tomalverson
Dec 1, 2005 2:22 pm
I just got a loaner ESI "Waveterminal 192X" (192kHz/24bit two analog in, 4 analog out) card from a friend to try out on my softrock. Does anyone know any...
1527
Phil Covington
phil_at_vhmi
Dec 1, 2005 1:14 pm
Great links... I use SciPy extensively. 73 de Phil N8VB...
1526
Edson Pereira
ewpereira
Dec 1, 2005 12:59 pm
There is also GNU Octave http://www.octave.org/ And for Python, SciPy http://www.scipy.org/ 73, -- Edson, n1vtn...
1525
Phil Covington
phil_at_vhmi
Dec 1, 2005 12:25 pm
http://www.scilab.org/ works great, especially if you cannot afford matlab... Phil N8VB...
