[amsat-bb] AO-07

[Greg D]

This is true for all linear transponders, not unique to AO-07.  It's the
way linear transponders work; the output power is divided among the
signals within the passband.  Once the total transmit power budget is
reached, a station using higher power starts taking power away from the
other stations, thus being a hog.  With linear transponders, the best
way to make your signal louder is to work first on your own receive
capability, not the transmit side.

What is a problem with AO-07, however, is that a strong enough station
can cause the satellite to use more power than the very old solar panels
can provide, and cause the satellite to crash and reset.  Please be
gentle with this old bird.

Greg  KO6TH


Jim Walls wrote:
> My first guess would be that because AO-7 is functionally running with no 
> battery, if one station is running high power, it easily hogs all the power 
> available.
>   
>  Jim
>  K6CCC
>   
>   
>   
>   
>  -------- Original Message --------
>> From: "Joe" <nss at mwt.net>
>> Sent: Friday, October 7, 2016 7:11 AM
>> To: "amsat-bb" <amsat-bb at amsat.org>
>> Subject: [amsat-bb] AO-07
>>
>> I wonder if anyone has actually done any studies after all these years
>> on propagation's through this bird. AO-07
>>
>> I find it in the past couple weeks soo interesting on how varied the
>> level of signal strengths can be on very similar passes.
>>
>> Where one pass, vs another are almost identical, yet one will be full of
>> stations, and the next one all I hear is my own CQ.
>>
>> BUT... that difference can be all made by just who is actually on the 
> air.
>> BUT.... then take two passes that are almost identical, and ignore all
>> the other people, and pay attention to just your own signal, where on
>> this pass my sig is soo weak that 90% of the time I'm hearing nothing,
>> then next pass that is very similar I am actually moving the S meter the
>> signal is sooo strong.
>>
>> And in theroy, this is all Line Of Sight communications, the losses from
>> one pass vs another should be the same.
>>
>> Yes polarity can be an issue, but I cant see it being the reason for the
>> whole pass duration.
>>
>> Very Interesting!
>>
>> Joe WB9SBD
>> --
>> Sig
>> The Original Rolling Ball Clock
>> Idle Tyme
>> Idle-Tyme.com
>> http://www.idle-tyme.com
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