[amsat-bb] Re: AO-51 mode change and recommendation
nss at mwt.net
Tue Dec 29 07:46:37 PST 2009
Just curious, Why voice only?
Why no CW?
*The Original Rolling Ball Clock
Luc Leblanc wrote:
> On 28 Dec 2009 at 19:13, Andrew Glasbrenner wrote:
> Date sent: Mon, 28 Dec 2009 19:13:24 -0500
> From: Andrew Glasbrenner <glasbrenner at mindspring.com>
> Subject: [amsat-bb] AO-51 mode change and recommendation
> To: Amsat-BB <amsat-bb at amsat.org>
>> AO-51 has been switched to the SSB/FM crossmode repeater, 145.880 USB
>> up, 435.150 FM down. Power output is 1.93 watts. The downlink modulation
>> is set very high, so that even very weak signals will be audible. The
>> downside to this is that someone running excessive power will cause the
>> downlink to distort.If this happens I'll be forced to adjust the
>> modulation level down, or possibly end the mode early. For a "normal"
>> station, 5 watts on the uplink to a modest gain antenna is entirely
>> sufficient. Please use the minimum power necessary. This mode -requires-
>> tuning the SSB uplink precisely for Doppler, and to effectively do that
>> you will need full duplex.
>> Please use this for voice communications only, until Straight Key Night,
>> when CW will be the designated mode.
>> Thanks, and enjoy this unusual mode.
>> 73, Drew KO4MA
>> AMSAT-NA VP Operations
> On the first 3.9 deg morning pass i was able to hear F6BYJ and an ON station my own downlink was quite distorted even with any
> signal/modulation level.
> On the second pass signal peak at S9 plus 20 but my downlink aidio was rather weak. Signal from the satellite was breaking up but i was
> able to hear my downlink with 5 watts for most of the past but as probably a commanding station was adjusting the levels the near end of
> the pass my audio became extremely weak and seems to never getting back at the AOS to TCA level.
> The first morning low pass audio adjustment produce a very good and clean signal but on the second one audio appears to be muted at AOS to
> TCA and became extremely muted on the second half on the pass to a point where no communication was possible. It is not a signal problem
> but just the audio who seems to be adjusted at the right level.
> No distortion has been noted too.
> The only one problem i was alone for the whole pass speaking to myself...
> Luc Leblanc VE2DWE
> Skype VE2DWE
> DSTAR urcall VE2DWE
> WAC BASIC CW PHONE SATELLITE
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