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@mwt.net Sent: Friday, October 7, 2016 7:11 AM To: "amsat-bb" amsat-bb@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
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Sent via AMSAT-BB@amsat.org. 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: http://www.amsat.org/mailman/listinfo/amsat-bb