[amsat-bb] TUning the antennas on a Cubesat

Franklin Antonio antonio at qti.qualcomm.com
Thu Sep 28 21:02:31 UTC 2017

Can't you just tune for maximum signal level received, and bypass measuring SWR?

From: AMSAT-BB <amsat-bb-bounces at amsat.org> on behalf of Robert Bruninga <bruninga at usna.edu>
Sent: Thursday, September 28, 2017 1:25 PM
To: amsat-bb at amsat.org
Cc: Jin Kang
Subject: [amsat-bb] TUning the antennas on a Cubesat

Someone asked me how to tune the antennas on a cubesat without the
instrumentation totally becoming part of the antenna system itself?

I said you have to put the SWR instrument inside the cubesat as we did
here:   http://aprs.org/PSAT2/SWR-testing-0160x.jpg

But that only works on a 1.5U cubesat where and MFJ Antenna Analyzer will

The other method is to just put in a bidirectional coupler chip, and then
feed the forward and reflected voltage taps to the internal cubesat
telemetry system and then compute the SWR from these two Forward and
Reflected power telemetry channels.

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