Re: [amsat-bb] Leo Bodnar ICOM IC-9700 Reference Injection Board
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 [email protected] 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_...
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 _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
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 [email protected] 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 [email protected] 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_...
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 _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
--
Mark L. Hammond [N8MH]
Thanks for the confirmation. I am just tickled with the 9700. Next up is trying out ECHO (WSJT-X)....
Bob W7OTJ
On Sat, Feb 15, 2020 at 6:57 AM Mark L. Hammond [email protected] wrote:
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 [email protected] 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 [email protected] 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_...
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 _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
--
Mark L. Hammond [N8MH]
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