I've been busy doing "other things", but have just seen the email messages about the V(USB)/U(FM) Mode.
So, gave it a go just now on the 09:40 UTC, 3rd November pass as AO-51 went just a little West of New Zealand.
I was able to work VK2ZAZ, Geff, in New South Wales, Australia, from here in Wellington, New Zealand.
Very cool giving it a go. Thanks to the AO-51 ops.
I used Nova to watch the pass and display the rotator settings, which I was changing manually. (Must get around to building the interface for that :-)
Used Ham Radio Delux to Doppler-tune my Kenwood TS-2000. Set to also support manual, so I could adjust the transmit a little to keep my pitch sounding OK.
As others have noted, including the message below, some very extreme level changes in the receive signal.
At times, fully quieting the FM receive, but then dipping right away to no copy, and then fading back again.
This is not something I have heard when AO-51 is in the more normal FM/FM mode.
Regards, Jim, ZL1TYF.
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Isao SEKI Sent: Thursday, 2 November 2006 10:33 p.m. To: [email protected] Cc: Isao SEKI Subject: [amsat-bb] Re: AO-51 SSB/FM mode
Fades suddenly comes and I feel that modulation of FM down signal is shallow.
Isao / JM1WBB
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Jim,
Thanks for that. I had been wondering whether the AGC was being pumped by stations just outside the audio passband trying to get on frequency, but I expect you have less traffic there. My experience is also that the audio, even for stations who are on frequency, is highly variable. Most of the ops are FM/FM regulars. In comparison to the usual mode, those with the best FM signals can sound the same on SSB/FM, and then fad to nearly unintelligibility. Sometimes the audio will jump up between one word and the next, though switching circularity can sometimes provide a similar jump.
Alan WA4SCA
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Alan P. Biddle
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jtowler