Re: [amsat-bb] WSJT-X FT8 QSO confirmed between W2JAZ and W5RKN on FO-29
Some may think it is experimental but I personally find it very disruptive to use certain digital modes on satellites. It is more disturbing when the stations performing these "experiments" fail to minimize their station ERP to a reasonable level.
Tonight on FO-29 I witnessed first hand how disruptive it is when a station decides to experiment with MSK144 while others are trying to use the shared transponder resource.
Some of these modes are 100% duty cycle for periods, then switch off, and back on again in a sequence. This doesn't seem very compatible with your typical satellite transponder.
For the life of me I cannot figure out why someone would even think about attempting these modes on AO-7 when the transponder's more sensitive nature is common knowledge.
73 Clayton W5PFG
I would have thought doppler would have killed a frequency dependant mode
Your sending a hf low noise mode over an FM bird ?
Nuts
Sent from my iPhone
On 17 Oct 2017, at 1:47 pm, Clayton Coleman [email protected] wrote:
Some may think it is experimental but I personally find it very disruptive to use certain digital modes on satellites. It is more disturbing when the stations performing these "experiments" fail to minimize their station ERP to a reasonable level.
Tonight on FO-29 I witnessed first hand how disruptive it is when a station decides to experiment with MSK144 while others are trying to use the shared transponder resource.
Some of these modes are 100% duty cycle for periods, then switch off, and back on again in a sequence. This doesn't seem very compatible with your typical satellite transponder.
For the life of me I cannot figure out why someone would even think about attempting these modes on AO-7 when the transponder's more sensitive nature is common knowledge.
73 Clayton W5PFG _______________________________________________ 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
FO-29 and AO-7 are not FM birds
73, Gabe NJ7H/VE6NJH
On Oct 17, 2017 9:04 AM, "Andrew Rich" [email protected] wrote:
I would have thought doppler would have killed a frequency dependant mode
Your sending a hf low noise mode over an FM bird ?
Nuts
Sent from my iPhone
On 17 Oct 2017, at 1:47 pm, Clayton Coleman [email protected]
wrote:
Some may think it is experimental but I personally find it very disruptive to use certain digital modes on satellites. It is more disturbing when the stations performing these "experiments" fail to minimize their station ERP to a reasonable level.
Tonight on FO-29 I witnessed first hand how disruptive it is when a station decides to experiment with MSK144 while others are trying to use the shared transponder resource.
Some of these modes are 100% duty cycle for periods, then switch off, and back on again in a sequence. This doesn't seem very compatible with your typical satellite transponder.
For the life of me I cannot figure out why someone would even think about attempting these modes on AO-7 when the transponder's more sensitive nature is common knowledge.
73 Clayton W5PFG _______________________________________________ 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 (3)
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Andrew Rich -
Clayton Coleman -
Gabriel Zeifman