A satellite transponder is a shared resource
There is a finite amount of shared satellite downlink power available for users of a linear transponder. When someone is operating CW and fails to adjust their power appropriately, everyone suffers.
I made this recording today:
https://soundcloud.com/w5pfg/fo-29-20161210-1805z-aa5pk-dl98-qro-cw
Glenn, AA5PK was operating portable from the USA/Mexico border in grid square DL98. Using an Icom IC-910 and Arrow antenna, you could tell he was perfectly readable yet in his voice you could detect very strong CW elsewhere on the satellite passband.
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.
73 Clayton W5PFG
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 N0ZGO
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
Thanks, Mike
Sent from my iPhone
On Dec 10, 2016, at 2:10 PM, Zach Metzinger [email protected] 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 N0ZGO
Sent via [email protected]. 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
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" [email protected] To: "Zach Metzinger" [email protected] Cc: "amsat-bb" [email protected] 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
Thanks, Mike
Sent from my iPhone
On Dec 10, 2016, at 2:10 PM, Zach Metzinger [email protected] 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 N0ZGO
Sent via [email protected]. 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
_______________________________________________ Sent via [email protected]. 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
You're spot on Bob,
I intended to stir some good ham radio memories !
Thanks, Mike
Sent from my iPhone
On Dec 10, 2016, at 9:48 PM, Bob- W7LRD [email protected] wrote:
good times indeed on AO-40 I had more fun than a human being is supposed to have (sobsob) 73 Bob W7LRD
From: "Mike Sprenger" [email protected] To: "Zach Metzinger" [email protected] Cc: "amsat-bb" [email protected] 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
Thanks, Mike
Sent from my iPhone
On Dec 10, 2016, at 2:10 PM, Zach Metzinger [email protected] 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 N0ZGO
Sent via [email protected]. 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
Sent via [email protected]. 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
participants (4)
-
Bob- W7LRD -
Clayton Coleman -
Mike Sprenger -
Zach Metzinger