[Ground-station] Ground-Station Digest, Vol 19, Issue 18

[Michelle Thompson]

If it can work, then I'm ready to fund, build, test, and promote.

Just need a circuit and a bill of materials.

-Michelle W5NYV




On Mon, Oct 28, 2019 at 3:41 PM KENT BRITAIN <wa5vjb at flash.net> wrote:

> With the new syn chips from TI, and others, they don't take that much
> power.
>
> We could do a lot with 50 milliwatts or so,  More up to whatever you are
> willing
> to provide to that last GaAs FET.   There is a reason NASA chose X-Band for
> the deep space network.    And the ground stations are cheap enough.
> Those xtal controlled LNB downconverters are only about $15.
>
> Kent
>
>
>
> On Monday, October 28, 2019, 5:23:01 PM CDT, Michelle Thompson via
> Ground-Station <ground-station at lists.openresearch.institute> wrote:
>
>
> What's the minimum power we need for a 10 GHz beacon?
>
> -Michelle W5NYV
>
>
>
>
> On Mon, Oct 28, 2019 at 2:59 PM Thomas Parry via Ground-Station
> <ground-station at lists.openresearch.institute> wrote:
>
> Hey,
>
> I've had a quick look at this and by my calculations you're only going to
> get 0.5 W from the solar cell at boresight. Adding the lack of maximum
> power point tracking I reckon you can only count on >250 mW for the design.
>
> I think this really precludes anything at 10 GHz. Anything that low power
> and low footprint will be custom silicon (or III-V). Although I would
> welcome being proved wrong.
>
> I'm my opinion that really pushes you into the sub-GHz option. Which
> raises the question of antennas, anything VHF will be very inefficient.
> Ideally a high UHF frequency?
>
> Will keep mulling it over and will have a deeper look into components.
>
> Thomas
>
> On Mon, 28 Oct 2019, 16:55 ,
> <ground-station-request at lists.openresearch.institute> wrote:
>
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> Today's Topics:
>
>    1. draft Custom Sensors Inspired by AmbaSat (Michelle Thompson)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 28 Oct 2019 08:52:26 -0700
> From: Michelle Thompson <mountain.michelle at gmail.com>
> To: Michelle Thompson via Ground-Station
>         <ground-station at lists.openresearch.institute>
> Subject: [Ground-station] draft Custom Sensors Inspired by AmbaSat
> Message-ID:
>         <
> CACvjz2XT19R27vXZHeuXuFpTS10-ZR7Cc5s3pPXMMp4xbBFnZw at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Here's a draft of the custom sensor document. These are ideas inspired by
> the AmbaSat project.
>
> Summary: beacons beacons beacons!
>
> I found *several* other AmbaSat people at AMSAT Symposium. Most of us have
> asked for specifications for the custom sensors and also for the custom
> board. Those specifications are still missing from this document, but I'll
> put them in when I get them.
>
> I've stepped up the Number of Asking Gently request level I am giving
> AmbaSat.
>
> If we can fill out the designs a bit then I can find funding to make
> prototypes. You never know who might fly something like a 10 GHz beacon if
> there's an easy-to-incorporate board.
>
> Take 15 minutes today and suggest some parts, additional sensor ideas, or
> provide feedback.
>
> -Michelle W5NYV
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