[amsat-bb] Leo Bodnar ICOM IC-9700 Reference Injection Board

[Mark L. Hammond]

Great. Sounds ok, Bob.  Other testing I did-look for harmonics of the
injected freq!! That was fun and confirming.  Did on all three bands, since
there were good multiples to listen to on each band.  Zoom in waterfall and
then turn signal off and on :-)  Get out the calculator....2M is 3x right??
49.152x3=147.456.  Keep going....showed me it was spot on all three bands.

Mark N8MH

On Sat, Feb 15, 2020 at 6:33 AM Bob Hammond <propgrinder at gmail.com> wrote:

> Mark, thanks for your description.  I followed it but could not see my 2M
> "birdy" move at all when enabling/disabling the reference board output!  I
> would like to assume that my 9700 is just so stable that the reference
> board is making little difference.
>
> I did hear a very slight beat frequency change when I enabled/disabled the
> reference board output.  What I did was adjust the coarse and fine sliders
> in the Ref section of the radio until the beat frequency was zero WITH the
> GPSDO output on.  I could hear a slight beat frequency when I shut it off.
>
> Think that's a valid test?  I have yet to repeat all this at 23cm.
>
> I was expecting a whopper correction using the GPSDO.
>
> 73,
>
> Bob W7OTJ
>
>
> On Fri, Feb 14, 2020 at 6:38 AM Mark L. Hammond <marklhammond at gmail.com>
> wrote:
>
>> Hi Bob,
>>
>> I have this setup.  It works great--and in fact so well, it's hard to
>> see!  The "setup" didn't do anything for me unless I ran the numbers WAY
>> off to one side or another.  Then the radio acted weird--it was effectively
>> messing up the proper oscillator freq. and sounded warbled.  I've put
>> coarse and fine in the middle of the recommended ranges and leave them
>> there...the "tuning" is broad. Don't fret over adjusting uch here...
>>
>> How can you see it working?  Here's what I did--use the waterfall to
>> watch a stable, steady signal (even a "Birdy") on 2M, on SSB.  Zoom in the
>> waterfall, so it's like +/- 2 kHz.  Now, using the software for the freq.
>> standard, toggle the reference signal ON and OFF, slowly....you should be
>> able to see the "birdy" move just a little, back and forth as you toggle
>> off and on.  With the freq. standard "on", it's in the right calibrated
>> place.  With it OFF, it's showing you how far off freq. your radio is
>> without correction.
>>
>> Hope that's clear! I spent some time convincing myself it was
>> working--and did what I tried to explain above.  check it out, let me know
>> how you make out.
>>
>> 73,
>>
>> Mark N8MH
>>
>> At 06:03 AM 2/14/2020 -0800, Bob Hammond via AMSAT-BB wrote:
>>
>> Anyone in the US use this board (along with a GPSDO) in their 9700?
>>
>>
>> http://www.leobodnar.com/shop/index.php?main_page=product_info&products_id=352
>>
>> How do you know it's actually working?  I have yet to be able to do their
>> set up suggestion as described.
>>
>> Always learning.....
>>
>> Bob W7OTJ
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>> --
Mark L. Hammond [N8MH]