[amsat-bb] Theseus Cores PFB Channelizer - update!

[Michelle Thompson]

They were quite vexing. Nothing quite like an error message that tells you
precisely zero.

I don't know what the exact root cause was. It was pretty deep in the FPGA
design that Phillip and EJ have been working on.

There was a separate conundrum with the length of the packets after
everything is divided up into channels. Too large, and the entire thing
fails. Too small, and you're wasting time in overhead.

-Michelle W5NYV




On Tue, Aug 6, 2019 at 10:23 PM Kenneth P Alexander <ve3hls at gmail.com>
wrote:

> Those channel 0 timeouts have been vexing me for ages! 😜
>
> Ken,
> So Phisai, Thailand
> Blog:  bueng-ken.com
>
> On Wed, Aug 7, 2019, 11:31 Greg D via AMSAT-BB <amsat-bb at amsat.org> wrote:
>
>> Great work, Michelle!
>>
>> But tell me, is a "Theseus Cores RFNoC polyphase filter bank
>> channelizer" anything like an "Illudium Q-36 Explosive Space Modulator"?
>>
>> What does this thing do, for those who don't speak Martian?
>>
>> Greg  KO6TH
>>
>>
>>
>> Michelle Thompson via AMSAT-BB wrote:
>> > Good news. The Theseus Cores RFNoC polyphase filter bank channelizer is
>> > working.
>> >
>> > The channel 0 timeouts, which were a vexing problem, seem to be gone
>> thanks
>> > to hard work from EJ Kreinar and Phillip Vallance.
>> >
>> > This particular part is vital for FDMA to TDM type payloads and
>> groundsats.
>> > Having a fast, efficient, open source implementation that works in GNU
>> > Radio is a big step forward.
>> >
>> > We are taking the entire setup with us to DEFCON. We are using a linux
>> > computer and a USRP. Experiments so far have been on the VHF ham bands
>> and
>> > FM broadcast. Next step, move it up to microwave and demonstrate Phase 4
>> > Ground channelization.
>> >
>> > If you're at DEFCON, come by and see us in ham radio village! There's a
>> > license exam session, demonstrations, presentations, and lots of
>> > socializing.
>> >
>> > More soon!
>> > -Michelle W5NYV
>> > _______________________________________________
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>> _______________________________________________
>> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
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>