[amsat-bb] TUning the antennas on a Cubesat

[Robert McGwier]

Yes

On Thu, Sep 28, 2017 at 5:02 PM, Franklin Antonio <antonio at qti.qualcomm.com>
wrote:

> 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
> fit!
>
>
>
> 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.
>
>
>
> Bob, WB4APR
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> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
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>



-- 
Bob McGwier
Founder, Federated Wireless, Inc
Founder and Technical Advisor, HawkEye 360, Inc
Research Professor Virginia Tech
Chief Scientist:  The Ted and Karyn Hume Center for National Security and
Technology
Senior Member IEEE, Facebook: N4HYBob, ARS: N4HY
Faculty Advisor Virginia Tech Amateur Radio Assn. (K4KDJ)
Director of AMSAT
Member of PVRC (Roanoke-Blacksburg), TAPR,  life member of ARRL and AMSAT,
NRVR.ORG (Rocketry)