[amsat-bb] Yaesu G-5500 question

Bob Hammond propgrinder at gmail.com
Thu Apr 2 16:14:46 UTC 2020

Jim, that's the very reason I installed a counterbalance.

Everyone, my question really was based on what I'm seeing when my antennas
rotate in AZ.  Given the moment arm of the counterbalance (about 3 feet)
and 5 LB weight on the end, once the rotor stops at an azimuth, I get about
3 cycles of wobble back and forth.  It does not affect satellite signal
(beam width) but I was wondering what it was doing to my rotor gears.

On the other hand, it's been like that for over 6 months of operation with
no issues.

It could be I'm finding comfort in worrying about something ELSE at this
time....if you get my meaning.



On Thu, Apr 2, 2020 at 8:13 AM jim--- via AMSAT-BB <amsat-bb at amsat.org>

> Bob Hammond asked (in part):
> > I have my M2 LEO antennas plus a WiMo 23cm helical antenna end-mounted
> on a
> > fiberglass boom with the G-5500.  I also placed a counterbalance lead
> > weight opposite the antennas.
> > How many of you with similar antennas and a G-5500 have NOT used a
> > counterbalance?  Any issues?
> I would highly recommend against using any substantial antenna arrangement
> on an elevation rotor without it being balanced.  If it is not balanced,
> you are putting far more strain on the gears and motor.  Try this to
> understand the difference.  Take your antenna, and hold it at one end with
> one hand.  Point it at the horizon.  Then rotate it so it points straight
> up.  Now move your hand so it is at the balance point, and repeat the
> demo.  Which one do think is easier?  Don't have an antenna handy, use a
> long piece of pipe, or conduit, or rebar, or even a stick or baseball bat.
> 73
> -----
> Jim Walls - K6CCC
> jim at k6ccc.org
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