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

[Mike Seguin]

And the LNB's are _really_ easy to lock to a 10 MHz GPSDO! Typically use 
25 MHz xtal.

For those that like Off The Shelf:

https://www.dxpatrol.pt/files/PLL25-LNB_-net.pdf

Mike

On 10/28/2019 6:41 PM, KENT BRITAIN via Ground-Station 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
>         <mailto: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
>         <mailto: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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>         End of Ground-Station Digest, Vol 19, Issue 18
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-- 

73,
Mike, N1JEZ
"A closed mouth gathers no feet"