On Tue, Oct 25, 2022 at 12:48:41PM -0400, Andrew Glasbrenner wrote:
And to be fair that is G3RUH/GMSK with no FEC. I’m sure there are more efficient options these days?
It depends on what you mean by "efficient". You won't find anything at those speeds that is more computationally efficient. Especially since that modulation is done by hardware in what we are working on.
It's difficult for me to believe that 9600 baud would work on a satellite without FEC. But, maybe so.
Anyway, anything with better performance (against noise, multipath, fading, etc.) is going to take more CPU time. With the hardware we are using, it's probably not feasible to run anything else. You would need either a faster CPU, or more likely due to power concerns, a CPU with a DSP built in, like the AM571x Sitara series from TI.
-corey
73, Drew KO4MA
Sent from my iPhone
On Oct 25, 2022, at 12:46 PM, Mark L. Hammond marklhammond@gmail.com wrote:
I think I said 500mW to 1W. :-). We know from AO-51 that 1/2 watt is ok. More is better :)
Mark N8MH
On Tue, Oct 25, 2022 at 12:21 PM Burns Fisher (AMSAT) wb1fj@fisher.cc wrote: That's pretty interesting that you feel we need 1 Watt or so for 9600 baud downlink, Mark. I'm not sure if anyone thought about that. We have also been talking about multiple speed uplinks. I.e. one receiver at 1200, 1 at 9600, or whatever. Personally I want a 1200 baud uplink for my *&)E^T# IC9700, which is otherwise a great radio :-)
73,
Burns Fisher, WB1FJ AMSAT(R) Engineering -- Flight Software
On Tue, Oct 25, 2022 at 12:04 PM Jonathan Brandenburg via pacsat pacsat@amsat.org wrote:
---------- Forwarded message ---------- From: Jonathan Brandenburg jbrandenburg@amsat.org To: pacsat@amsat.org Cc: Bcc: Date: Tue, 25 Oct 2022 11:04:28 -0500 Subject: [pacsat] Re: Introduction and Falconsat-3 question On 10/25/2022 10:45 AM, Mark L. Hammond wrote:
My question--is there one day each week where you'd like me to turn ON Falconsat-3 for about 24 hours of operations?
Thank you for the offer, Mark!
This might be the kick in the pants I need to finally assemble my satellite packet station. I'll get to work on that right away. In the meantime, I hope others on this list are more prepared than I am.
Jonathan
-- Jonathan, KF5IDY
---------- Forwarded message ---------- From: Jonathan Brandenburg via pacsat pacsat@amsat.org To: pacsat@amsat.org Cc: Bcc: Date: Tue, 25 Oct 2022 11:04:28 -0500 Subject: [pacsat] Re: Introduction and Falconsat-3 question
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--
Mark L. Hammond [N8MH]
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