[amsat-bb] Re: Help with Yaesu g5500
Alan P. Biddle
APBIDDLE at UNITED.NET
Sun Nov 22 17:19:26 PST 2009
I had a slightly related problem which turned out to be the phase shift
capacitor in the rotator. You can see it on the schematic. The rotator
would work fine with no load, and would generate more torque than you could
stop with your hand. However, it would not move my array, which is
admittedly overloaded. There was definitely a thermal effect here, in that
on a cool day it would work a little, but not on a hot one. Replacing the
capacitor solved the problem, but it was messy. If they just plugged it in
but did not test it under a real load, they MIGHT have missed a problem. My
experience with Yaesu/Vertex techs is that they are either excellent, or
incompetent, with little in between.
If you can find a good capacitor, you can bridge the lines at the control
box end in parallel with the rotator unit. If it works, or works better,
that is a good indication of a bad internal capacitor.
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Michael J. Wolthuis
Sent: 22 November, 2009 19:07
To: Elan Portnoy
Cc: amsat-bb at amsat.org
Subject: [amsat-bb] Re: Help with Yaesu g5500
Not the switch unfortunately. The same problem occurs when controlled
by computer from Uni_trac 2000. Work about 25% of the time.
Elan Portnoy wrote:
> Spray-out the switch with cleaner?
> --- On Fri, 11/20/09, wolthui3 at msu.edu <wolthui3 at msu.edu> wrote:
>> From: wolthui3 at msu.edu <wolthui3 at msu.edu>
>> Subject: [amsat-bb] Help with Yaesu g5500
>> To: amsat-bb at amsat.org
>> Date: Friday, November 20, 2009, 11:12 PM
>> I bought a used Yaesu g5500 and it
>> has a strange problem. The AZ works perfect, but when I
>> push the EL button it seems to work (ie. Move up or down)
>> about 1 out of 4 tries. I can regularly duplicate the
>> issue where I can't get EL to change. If I wait 30mins and
>> come back then it sometimes works right away.
>> The rotor itself was into Yaesu and they said it was 100%
>> perfectly fine. I have tried swapping the AZ/EL cables
>> around and no difference.
>> It has to be a controller issue I think. Any ideas before
>> I box it up and ship it to Yaesu to check?
>> When it works, it works fine and typically for 5-10mins
>> straight, but then suddenly it will not change again.
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