[amsat-bb] Link budgets for upcoming HEO/GEO sats

[Edward R Cole]

John, etal:

Hope someone tests this and gives a report.  Cost is quite reasonable 
for this kind of power at 5-GHz.  Note that the DEMI 5670-144 
transverter output is +16 dBm (200mw) so one could obtain 2w with 
drive from one.  ERA-5 was common mmic used for this level.  Getting 
600mw is a bit harder.

Most of these run class-A so do dissipate a lot of heat; most of the 
power becomes heat and not RF. 10-dB RF gain is respectable at microwave.

Comment on az-el suitable for 1m dishes at 5 and 10-GHz.  The Yaesu 
satellite rotators do not resolve pointing angle less than 7-1/2 
degree so probably not adequate.  There are some inexpensive 
telescope drives that might work at reasonable prices.

73, Ed - KL7UW

Date: Sun, 10 Apr 2016 13:24:40 -0500
From: John Toscano <tosca005 at umn.edu>
To: n1jez at burlingtontelecom.net
Cc: AMSAT BB <amsat-bb at amsat.org>
Subject: Re: [amsat-bb] Link budgets for upcoming HEO/GEO sats

Looking forward to testing mine too. I found another web site that claims
that 600mW of input drive would give nearly 5W of output.

http://www.aliexpress.com/item/Free-Shipping-Power-Microwave-TXPA58002W5-5-8GHz-5-8G-AV-Wireless-Transmitter-Tx-Signal-Booster/32231215867.html?spm=2114.40010208.4.133.5VRg7W

He has a few pictures showing him taking power measurements himself, making
this a bit more believable. Would have to watch the heat dissipation
closely, since they quote 20 watts of supply power (so 15 or more watts of
heat).

John



73, Ed - KL7UW
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