[amsat-bb] ORI Transponder Design Review 30 July 2020

[Michelle Thompson]

Good question, thank you.

We did a survey of communications systems similar to this design for the
Commodity Jurisdiction request. Most of those are substantially more
expensive than our price target. Some provided much less functionality or
had very restricted user interfaces.

Our 5GHz RF efforts focus on a design originally outlined by Mike Seguin
N1JEZ, using Skywave parts, and prototyped by Julian KF4MOT. I'm sure he'd
appreciate additional help.

There is a lot of useful feedback from recent work with the AREx team that
will be incorporated and a variety of daughter cards we use in the lab.

The goal from a product point of view is to provide more than enough
information for people to use existing SDRs and amplifiers, as well as
providing a manufactured solution.

-Michelle W5NYV




On Thu, Jul 23, 2020 at 2:17 PM Robert MacHale <robert.machale at yahoo.com>
wrote:

> Which existing product most closely match the completed P4XT functionality?
>
> Are there any affordable modulators for Ham Radio ground stations?
>
> [1] For reference:
> https://work-microwave.com/wp-content/uploads/2019/01/V2_DVB_SDMO_1903-2.pdf
>
> Robert MacHale
> . KE6BLR Ham Radio License
> . http://www.aprsat.com/predict
> . http://www.spaceCommunicator.club
> . Supporting Boy Scout Merit Badges in Radio, Robotics, and Space
> Exploration
>
> Silly Joke: What did the little mountain say to the bigger mountain? Hi
> Cliff!Political Quote: He who dares not offend cannot be honest. -- Thomas
> Paine
>
>
>
>
>
>
> On Thursday, July 23, 2020, 01:00:27 PM PDT, Michelle Thompson via
> AMSAT-BB <amsat-bb at amsat.org> wrote:
>
>
>
>
>
> Greetings all!
>
> A design review workshop has been scheduled for 7am Pacific 30 July 2020
> for the 6U digital multiplexing transponder from Open Research Institute.
> This work is made available for free to the general public and assumes
> AMSAT as the primary audience and beneficiary.
>
> The design is the same as one in progress for AREx (AMSAT/ARISS USA). The
> design review will be of direct benefit to AREx and meets their
> requirements.
>
> The design is under consideration for other missions.
>
> If you would like to participate in the design review workshop, then please
> write me at w5nyv at arrl.net for a Zoom invite.
>
> The communications functions and circuits are the focus of this review.
>
> System architecture document can be found here:
>
> https://github.com/phase4space/payload-dmt/tree/master/doc/system-architecture
>
> (Brief) Statement of Work for Phase 1 can be found here:
>
> https://openresearch.institute/wp-content/uploads/sites/10/2020/02/Summary-Proposal-Open-Research-Institute-Phase-1-P4XT-.pdf
>
> Thank you!
> -Michelle W5NYV
> (One of your AMSAT Directors)
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