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

[Bob Hammond]

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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