[amsat-bb] Link budgets for upcoming HEO/GEO sats
Edward R Cole
kl7uw at acsalaska.net
Sun Apr 10 21:43:06 UTC 2016
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.
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
73, Ed - KL7UW
"Kits made by KL7UW"
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