<html><head></head><body><div class="ydpfaf54883yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;" dir="ltr" data-setdir="false"><div></div><div>With the new syn chips from TI, and others, they don't take that much power.</div><div><br></div><div dir="ltr" data-setdir="false">We could do a lot with 50 milliwatts or so, More up to whatever you are willing</div><div dir="ltr" data-setdir="false">to provide to that last GaAs FET. There is a reason NASA chose X-Band for</div><div dir="ltr" data-setdir="false">the deep space network. And the ground stations are cheap enough.</div><div dir="ltr" data-setdir="false">Those xtal controlled LNB downconverters are only about $15.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Kent<br></div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"><br></div><div><br></div>
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On Monday, October 28, 2019, 5:23:01 PM CDT, Michelle Thompson via Ground-Station <ground-station@lists.openresearch.institute> wrote:
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<div><div id="ydpd1236080yiv2824056727"><div><div dir="ltr">What's the minimum power we need for a 10 GHz beacon? <br clear="none"><br clear="all"><div><div class="ydpd1236080yiv2824056727gmail_signature" dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr">-Michelle W5NYV<br clear="none"><br clear="none"><div dir="ltr"><br clear="none"></div></div></div></div></div></div></div></div></div><br clear="none"></div><br clear="none"><div class="ydpd1236080yiv2824056727yqt9991509912" id="ydpd1236080yiv2824056727yqt22326"><div class="ydpd1236080yiv2824056727gmail_quote"><div class="ydpd1236080yiv2824056727gmail_attr" dir="ltr">On Mon, Oct 28, 2019 at 2:59 PM Thomas Parry via Ground-Station <ground-station@lists.openresearch.institute> wrote:<br clear="none"></div><blockquote class="ydpd1236080yiv2824056727gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;"><div><div>Hey, </div><div><br clear="none"></div><div>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. </div><div><br clear="none"></div><div>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. </div><div><br clear="none"></div><div>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? </div><div><br clear="none"></div><div>Will keep mulling it over and will have a deeper look into components. </div><div><br clear="none"></div><div>Thomas<br clear="none"><br clear="none"><div class="ydpd1236080yiv2824056727gmail_quote"><div class="ydpd1236080yiv2824056727gmail_attr" dir="ltr">On Mon, 28 Oct 2019, 16:55 , <ground-station-request@lists.openresearch.institute> wrote:<br clear="none"></div><blockquote class="ydpd1236080yiv2824056727gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;">Send Ground-Station mailing list submissions to<br clear="none">
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1. draft Custom Sensors Inspired by AmbaSat (Michelle Thompson)<br clear="none">
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Message: 1<br clear="none">
Date: Mon, 28 Oct 2019 08:52:26 -0700<br clear="none">
From: Michelle Thompson <<a shape="rect" href="mailto:mountain.michelle@gmail.com" rel="nofollow" target="_blank">mountain.michelle@gmail.com</a>><br clear="none">
To: Michelle Thompson via Ground-Station<br clear="none">
<ground-station@lists.openresearch.institute><br clear="none">
Subject: [Ground-station] draft Custom Sensors Inspired by AmbaSat<br clear="none">
Message-ID:<br clear="none">
<<a shape="rect" href="mailto:CACvjz2XT19R27vXZHeuXuFpTS10-ZR7Cc5s3pPXMMp4xbBFnZw@mail.gmail.com" rel="nofollow" target="_blank">CACvjz2XT19R27vXZHeuXuFpTS10-ZR7Cc5s3pPXMMp4xbBFnZw@mail.gmail.com</a>><br clear="none">
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Here's a draft of the custom sensor document. These are ideas inspired by<br clear="none">
the AmbaSat project.<br clear="none">
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Summary: beacons beacons beacons!<br clear="none">
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I found *several* other AmbaSat people at AMSAT Symposium. Most of us have<br clear="none">
asked for specifications for the custom sensors and also for the custom<br clear="none">
board. Those specifications are still missing from this document, but I'll<br clear="none">
put them in when I get them.<br clear="none">
<br clear="none">
I've stepped up the Number of Asking Gently request level I am giving<br clear="none">
AmbaSat.<br clear="none">
<br clear="none">
If we can fill out the designs a bit then I can find funding to make<br clear="none">
prototypes. You never know who might fly something like a 10 GHz beacon if<br clear="none">
there's an easy-to-incorporate board.<br clear="none">
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Take 15 minutes today and suggest some parts, additional sensor ideas, or<br clear="none">
provide feedback.<br clear="none">
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-Michelle W5NYV<br clear="none">
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