[amsat-bb] A satellite transponder is a shared resource
w7lrd at comcast.net
Sun Dec 11 02:48:35 UTC 2016
good times indeed on AO-40 I had more fun than a human being is supposed to have (sobsob)
73 Bob W7LRD
----- Original Message -----
From: "Mike Sprenger" <mikesprenger at gmail.com>
To: "Zach Metzinger" <zmetzing at pobox.com>
Cc: "amsat-bb" <amsat-bb at amsat.org>
Sent: Saturday, December 10, 2016 5:04:59 PM
Subject: Re: [amsat-bb] A satellite transponder is a shared resource
On AO40 Leila would definitely tell you if you were too hot on the uplink. But, it wasn't unreasonable...good times.
Oh....to think about squint angle (of the directional satellite antenna pointed at your location vs your receiving antenna. Good times they were
Sent from my iPhone
> On Dec 10, 2016, at 2:10 PM, Zach Metzinger <zmetzing at pobox.com> wrote:
>> On 12/10/16 12:47, Clayton Coleman wrote:
>> Often there are portable stations running 5 watts with their Arrow
>> antennas. Please, please reduce your CW power. If you are operating CW
>> to overcome hearing deficiencies at your station,please consider
>> making station improvements rather than taking more of the
>> transponder's limited power for yourself.
> This is a great example of where a digitally processed (DSP/SDR) transponder would excel.
> Assuming that any one uplink signal didn't crush a sensitive receiver/ADC with good dynamic range, it could process all signals in the pass-band and AGC the problematic ones before sending the signal back to an output DAC/filter/PA.
> I never AO-40, so I haven't experienced LEILA in action, but the idea would be similar. "Quieting the alligators"
> --- Zach
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Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
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