[amsat-bb] Re: Yaesu 5500 Rotor Problem

Fri Jan 28 06:51:25 PST 2011


Start by checking the connections in the shack at the controller.  If they
are good, then disconnect lines 1, 2, and 3 on the elevation side and check
the _cables_ with an ohm meter.  You should read 500 ohms between 1 and 3,
and something intermediate between 1 and 2, and between 2 and 3.  If the
antenna is parked, one of them will be close to 0 ohms, and the other almost
500 ohms, so it is better to point the antenna at 45 degrees or so.  You can
see a clear difference, and eliminate a shorted or open line.  If this
checks good, then the problem is inside the controller.  

If you don't, then you either have a bad connection in the cable or
connector at the rotator, or the reference potentiometer is bad in the
rotator.  The easiest way to check this is to swap the connectors at the
rotators.  The systems are electrically identical.  If the problem follows
the connectors, there is a problem in the cable or connector.  If not, it is
in the rotator.

Fixing the rotator pot is messy but straight forward, requiring only
mechanical skills, and there have been several reports on how to do that.
Fixing the controller depends on what is wrong.  In either case, Yaesu will
repair them for a "modest" fee.

Let us know what you find.


-----Original Message-----
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Bill Gillenwater
Sent: Friday, January 28, 2011 8:21 AM
To: AmsatBBS
Subject: [amsat-bb] Yaesu 5500 Rotor Problem

The meter for elevation on the Yaesu 5500 is not working. Any idea what
might be wrong? Are there places to have them fixed if I can't shoot the
bug? Thanks. Bill K3SV
Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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