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

[KENT BRITAIN]

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 willingto provide to that last GaAs FET.   There is a reason NASA chose X-Band forthe 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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