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SDR2GO

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  • Sid Boyce
    Well spotted Kees, My mistake, while last minute checking the SDR2GO I thought I had incorrectly inserted the diodes D1/D2, so I changed them around forgetting
    Message 1 of 26 , Apr 30, 2011
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      Well spotted Kees,
      My mistake, while last minute checking the SDR2GO I thought I had
      incorrectly inserted the diodes D1/D2, so I changed them around
      forgetting that the voltages were OK during the build stage.
      The SDR2GO is alive just waiting to be connected to SR after some
      perusal of the Builder's notes for setup instructions.
      73 ... Sid.

      On 29/04/11 19:38, Kees & Sandy wrote:
      > Sid,
      >
      > Please send me the voltages on the LCD pins (direct - offline) and I can
      > probably tell you what's wrong.
      >
      > 73 Kees K5BCQ
      >
      > ---------- Original Message ----------
      > From: Sid Boyce <sboyce@...>
      > To: softrock40@yahoogroups.com
      > Subject: Re: [softrock40] Re - redesign or scrap?
      > Date: Fri, 29 Apr 2011 17:23:02 +0100
      >
      > I've followed Ben's work and was hoping to mate the UHFSDR with the
      > SDR2GO. I cant get any display on the LCD though everything else seems
      > OK with jumpering.
      > Kees, what's the spec of the LCD so I can try another one.
      > 73 ... Sid.
      >
      > On 29/04/11 16:41, Kees & Sandy wrote:
      > > Ben Bibb, NO5K, has used his UHFSDR on several HF bands and 2m with
      > > success. not only on the VHF band but also with the SDR2GO. The UHFSDR
      > > is the only one with HF/VHF/UHF capability (to my knowledge). You can
      > > see some pictures of Ben's rig (the RF and PA boards are unplugged) at
      > > http://www.qsl.net/k5bcq/Kits/Kits.html under kit #10
      > >
      > > 73 Kees K5BCQ
      > >
      > > ---------- Original Message ----------
      > > From: John Williams <KE5SSH@...>
      > > To: softrock40@yahoogroups.com
      > > Subject: Re: [softrock40] Re - redesign or scrap?
      > > Date: Fri, 29 Apr 2011 10:15:22 -0500
      > >
      > > Bob,
      > >
      > > As long as we seem to be suggesting how you should spend your
      > > money/time, I would propose a look at the UHFSDR board. It seems to be
      > > component-ized such that careful design/building practices could yield a
      > > hf/uhf/vhf transceiver. As with other kits, not a lot of successful
      > > implementations to point to as a reference.
      > >
      > > Your thoughts?
      > >
      > > John ke5ssh
      > >
      > > On 4/29/2011 9:38 AM, Sid Boyce wrote:
      > > > Some useful points there, just time to implement them. I always
      > favoured
      > > > having the PA as a separate board.
      > > > I understand the limitations you have with the SDR-Widget and that you
      > > > can't ask your OS vendor to implement UAC2, he'd probably tell you
      > to go
      > > > forth and multiply if you ever got a response. MacOSX already supported
      > > > UAC2 and bang we got it supported in my only OS's kernel and I'm
      > > > currently running sdr-shell/linrad/quisk at 192K samplerate with the
      > > Widget.
      > > > 73 ... Sid.
      > > >
      > > > On 29/04/11 09:48, g8voip wrote:
      > > >> Hi Sid,
      > > >>
      > > >> You really do have to watch out for that, it can be extremely
      > dangerous
      > > >> and got me into trouble many times :)
      > > >>
      > > >> Sadly I think that the current v4.3 mobo PCB layout is beyond
      > > redemption.
      > > >>
      > > >> Really just too much activity going on in too smaller place. The
      > > >> proximity of the controller and active I2C lines around the board
      > and in
      > > >> amongst the RF side is a recipe to cause a lot of unwanted pickup and
      > > >> interference.
      > > >>
      > > >> I would be interested to see if adding the SDR-Widget and moving the
      > > >> active controller off the v4.3 mobo makes any improvement.
      > > >>
      > > >> Personally I am not prepared to risk shelling out that additional cost
      > > >> to prove the point, as the limitations of the SDR-Widget using
      > Windows,
      > > >> and only having a single line input and output would be inferior to my
      > > >> current set up using the Delta 44 card. The SDR-Widget would have
      > all of
      > > >> the problems associated with trying to run PSDR with two separate
      > sound
      > > >> cards. I previously 'wasted' a year trying to do that! The SDR
      > hardware
      > > >> really has to capable of working with the existing SDR software.
      > > >>
      > > >> If I ever built up any enthusiasm for the v4.3 mobo in the future, the
      > > >> only thing I think worth trying is to cut every track carrying the I2C
      > > >> signals near their source and insert small ferrite filters. I believe
      > > >> Rob M0RZF has done this and it gave some improvement.
      > > >>
      > > >> If you look back to my posts early last year when there were
      > discussions
      > > >> regarding what was to follow the v6.3 RXTX and v9.0 RX, you will see I
      > > >> favour a completely different approach.
      > > >>
      > > >> Whilst the single board designs are extremely popular and make
      > kitting a
      > > >> lot more efficient, there were initially noise issues simply from
      > > >> combining all of the functions onto a single PCB. The Ensemble
      > RXTX took
      > > >> several iterations and one complete PCB re-design to achieve similar
      > > >> performance to the existing v6.3 RXTX modular approach.
      > > >>
      > > >> I believe to be able to achieve the best possible performance from
      > sound
      > > >> card based SDR gear, a modular approach is possibly the best way
      > to go.
      > > >>
      > > >> That would allow the main controller / PC interface and perhaps the
      > > >> local oscillator to be encased in its own fully screened enclosure and
      > > >> appropriate filtering applied to all input and output lines.
      > > >>
      > > >> The QSD (receiver) and QSE (transmitter) again could be separate
      > > >> modules, along with a PA stage and a common filter module.
      > > >>
      > > >> Using a building block approach would allow any part to be upgraded
      > > >> independently without having to start from scratch, and enable
      > builders
      > > >> to make a common controller / LO first then add the receiver, to
      > > >> eventually progress to a full transceiver if or when desired.
      > > >>
      > > >> All of the building blocks already pretty much exist.
      > > >>
      > > >> I have recently acquired an Avala01 PCB to build up from my junk box
      > > >> bits as I am curious to try another existing design to see how well it
      > > >> performs compared to the SoftRock's. It has the flexibility to turn it
      > > >> into an all band transceiver with the addition of a decent LO,
      > > >> controller and switched LPF module.
      > > >>
      > > >> If you take a look at the SoftRock's, YU1LM, FA-SDR, Lima SDR and
      > other
      > > >> similar designs, I reckon you could extract the best bits, to
      > produce a
      > > >> decent all band SDR transceiver.
      > > >>
      > > >> I have many of the building blocks lying around, SDR-Kits USB synth, a
      > > >> UBW board with Alex's firmware, just acquired a couple of Atmel
      > > >> ATMega168 devices to have a play with Loftur's original controller for
      > > >> his v3.6 mobo etc.
      > > >>
      > > >> There are other developments in the pipline that could perhaps
      > influence
      > > >> my approach. Christos SV1EIA's USB2SDR module not only would deal with
      > > >> the PC / audio side but appears to potentially offer the complete
      > > >> controller solution as well.
      > > >>
      > > >> It's going to be a very long term project, likely to be all simply
      > > >> bread-boarded to see what can actually be achieved.
      > > >>
      > > >> Just so it is not miss-understood in any way, I fully support Tony's
      > > >> approach with the current kit range as that is by far the best
      > approach
      > > >> to enable the majority of people to take the next step up from the
      > > >> introductory LiteII receiver kits to a multi-band SDR transceiver.
      > > >>
      > > >> This discussion is aimed at those who want to take the next step
      > beyond
      > > >> that towards a complete all band HF transceiver.
      > > >>
      > > >> 73, Bob G8VOI
      > > >>
      > > >> --- In
      > softrock40@yahoogroups.com<mailto:softrock40%40yahoogroups.com>,
      > > >> Sid Boyce<sboyce@...> wrote:
      > > >> >
      > > >> > Hi Bob,
      > > >> > I got to thinking - always dangerous.
      > > >> > With your undoubted abilities and the fact that this is open
      > hardware,
      > > >> > perhaps you could improve on the design and layout of the Mobo.
      > > >> > I am sure we could all benefit from the improved performance it
      > would
      > > >> bring.
      > > >> > 73 ... Sid.
      > > >> >
      > > >> > On 27/04/11 16:39, g8voip wrote:
      > > >> > >
      > > >> > > Hi Sid,
      > > >> > >
      > > >> > > I suspect many of the v4.3 mobo's built are probably doing the
      > > same as
      > > >> > > mine, gathering dust in the corner on the floor!
      > > >> > >
      > > >> > > As far as I was aware Art was only putting the kits together. It
      > > really
      > > >> > > needs a complete rethink and the PCB relaid to minimise noise
      > > etc and
      > > >> > > tidy up the PA section.
      > > >> > >
      > > >> > > The problems with it are well known and have been largely
      > > dismissed by
      > > >> > > those involved.
      > > >> > >
      > > >> > > A friend built one aiming to use it as a 10m driver with a 2m
      > > >> > > transverter, but receive wise it really is not up to the task,
      > same
      > > >> > > complaint as me regarding the excessive tuning noise and multiple
      > > >> > > spurious in band signals.
      > > >> > >
      > > >> > > Perhaps I was expecting too much from it :)
      > > >> > >
      > > >> > > The software side and features are very nice, but the
      > > degradation in RF
      > > >> > > performance on the bands above 20m when tuning make it barely
      > > usable as
      > > >> > > a receiver. The suggested solution was not to tune, just click and
      > > >> point
      > > >> > > on the PC! Really helpful.
      > > >> > >
      > > >> > > Adding the SDR-Widget would only make matters worse as the lower
      > > noise
      > > >> > > floor would expose the problem to an even greater extent.
      > > >> > >
      > > >> > > I am still undecided what to do with mine, either to spend a
      > lot of
      > > >> time
      > > >> > > with a scalpel cutting tracks and inserting ferrite filters to
      > > try and
      > > >> > > reduce the I2C noise pickup, or just to scrap it and use the
      > v6.3ng
      > > >> > > board along with a spare set of 10m PA / filter modules to make a
      > > >> > > dedicated transverter driver.
      > > >> > >
      > > >> > > Not got any regrets building it, just dissappointed in the end
      > > result.
      > > >> > >
      > > >> > > I am currently slowing putting together one of the Indian PCBs
      > > for the
      > > >> > > YU1LM Avala01 transceiver with bits from my junk box, with an
      > eye on
      > > >> > > adding my own controller and filter module to convert it into a
      > > 9 or 10
      > > >> > > band 5W HF SDR transceiver. Doing it more out of interest to see
      > > how it
      > > >> > > compares with the SoftRock's rather than any particular need.
      > > >> > >
      > > >> > > 73, Bob G8VOI
      > > >> > >
      > > >> > > --- In softrock40@yahoogroups.com
      > > >> <mailto:softrock40%40yahoogroups.com>
      > > <mailto:softrock40%40yahoogroups.com>,
      > > >> > > Sid Boyce<sboyce@> wrote:
      > > >> > > >
      > > >> > > > Agreed you need to be light with the solder, just enough so it
      > > >> doesn't
      > > >> > > > migrate.
      > > >> > > > With the Mobo, unfortunately Art had to drop the project at
      > short
      > > >> > > > notice, so it was unavailable until recently when Alan (The
      > > >> Silver Fox)
      > > >> > > > got the whole kit and kaboodle from Art and went into kit
      > > production.
      > > >> > > > As for the board redesign, perhaps Alex has not given it any
      > > >> thought due
      > > >> > > > to lack of concerns from builders.
      > > >> > > > This is the first time I have seen these issues raised. Has
      > > Alex been
      > > >> > > > made aware?
      > > >> > > >
      > > >> > > > With regards to spacers, I know they have been around for
      > > decades but
      > > >> > > > I've seen scant use in mainframe and Sun servers. You'd have to
      > > >> be very
      > > >> > > > heavy handed as some very power hungry chips I've come across
      > > >> that have
      > > >> > > > very little in the way of space between legs never suffered
      > > they got
      > > >> > > > very hot even though the had cooling towers and bags of cold air
      > > >> passing
      > > >> > > > over them.
      > > >> > > > 73 ... Sid.
      > > >> > > >
      > > >> > > > On 27/04/11 12:51, g8voip wrote:
      > > >> > > > > Hi Sid,
      > > >> > > > >
      > > >> > > > > The 2N2222A (Q6) on the Ensemble RXTX IS a metal cased
      > > >> transistor and
      > > >> > > > > extremely easy to get a short underneath it due to the solder
      > > >> > > wicking up
      > > >> > > > > the plated through holes if you are a bit too enthuiastic
      > > with the
      > > >> > > solder.
      > > >> > > > >
      > > >> > > > > Fitting purpose made insulation washers was standard
      > > practice, well
      > > >> > > > > certainly during my time working for Plessey and Marconi in
      > > the 80s
      > > >> > > and 90s.
      > > >> > > > >
      > > >> > > > > As for the v4.3 mobo problems, the PCB layout around the
      > driver
      > > >> and PA
      > > >> > > > > stages is a real mess. Really should have been relaid out
      > > >> before the
      > > >> > > > > 'production' PCBs and kits were sold. Really still very much a
      > > >> beta in
      > > >> > > > > every sense, but there seems to be no interest in resolving
      > > all the
      > > >> > > > > issues with it. Sadly those involved seem to be in too
      > much of a
      > > >> > > rush to
      > > >> > > > > move on to new things before every properly finished any
      > > project.
      > > >> > > > >
      > > >> > > > > 73, Bob G8VOI
      > > >> > > > >
      > > >> > > > > --- In softrock40@yahoogroups.com
      > > >> <mailto:softrock40%40yahoogroups.com>
      > > >> > > <mailto:softrock40%40yahoogroups.com>
      > > >> <mailto:softrock40%40yahoogroups.com>,
      > > >> > > > > Sid Boyce<sboyce@> wrote:
      > > >> > > > > >
      > > >> > > > > > The only really important thing is that there should be no
      > > shorts
      > > >> > > > > > between the legs and that's most likely on the
      > underside. It's
      > > >> > > not even
      > > >> > > > > > common in the most professional equipment that runs 24/7
      > > with 999
      > > >> > > years
      > > >> > > > > > uptime guaranteed, to use nylon spacers everywhere there
      > is a
      > > >> canned
      > > >> > > > > > transistor and I've never come across them used on a plastic
      > > >> > > transistor
      > > >> > > > > > - may be an obvious reason is that the case is plastic.
      > > >> > > > > >
      > > >> > > > > > Where I did have trouble was with the 2N3866 on the Mobo and
      > > >> had to
      > > >> > > > > > extend the short leads as when mounted flush to the board
      > > >> there was
      > > >> > > > > > coupling between the case and the ground plane which
      > > caused the
      > > >> > > output
      > > >> > > > > > to be very distorted and very low.
      > > >> > > > > >
      > > >> > > > > > I have never in decades built a transceiver using spacers,
      > > >> including
      > > >> > > > > > transistors for RF/IF amps, synthesized VFO's and in about
      > > every
      > > >> > > stage.
      > > >> > > > > > I have had to put sleeving on transistor leads to insulate
      > > them
      > > >> > > from the
      > > >> > > > > > ferrite beads they passed through.
      > > >> > > > > >
      > > >> > > > > > Another example is on the Driver/PA stage of the SR v6.3 and
      > > >> Ensemble
      > > >> > > > > > RXTX where the leads are long and pads close together,
      > yet no
      > > >> > > spacers.
      > > >> > > > > > 73 ... Sid.
      > > >> > > > > >
      > > >> > > > > > On 27/04/11 02:22, Michael Di Domenico wrote:
      > > >> > > > > > > I forgot to install the nylon washer between the board and
      > > >> the npn
      > > >> > > > > > > transistor on an ensemble rxtx. How important is it? it's
      > > >> not going
      > > >> > > > > > > to be pretty to unsolder this...
      > > >> > > > > > >
      > > >> > > > > > >
      > > >> > > > > >
      > > >> > > > > >
      > > >> >
      > > >> > --
      > > >> > Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
      > > >> > Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
      > > >> > Senior Staff Specialist, Cricket Coach
      > > >> > Microsoft Windows Free Zone - Linux used for all Computing Tasks
      > > >> >
      > > >>
      > > >>
      > > >
      > >
      > > --
      > >
      > > John Williams
      > > WQKA523
      > > KE5SSH
      > >
      > >
      > >
      > > ------------------------------------
      > >
      > > Yahoo! Groups Links
      > >
      > >
      > >
      > >
      >
      >
      > --
      > Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
      > Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
      > Senior Staff Specialist, Cricket Coach
      > Microsoft Windows Free Zone - Linux used for all Computing Tasks
      >
      >
      > ------------------------------------
      >
      > Yahoo! Groups Links
      >
      >
      >
      >


      --
      Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
      Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
      Senior Staff Specialist, Cricket Coach
      Microsoft Windows Free Zone - Linux used for all Computing Tasks
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