[amsat-bb] A satellite transponder is a shared resource

Mike Sprenger mikesprenger at gmail.com
Sun Dec 11 01:04:59 UTC 2016

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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