First, the motor drive voltage should be DC, about 12v, it reverses polarity
to change direction. I would disconnect it at the polyphaser and check the
resistance through the motor. Also check the resistance through the pot at
that point, it should be 500 ohms end to end. You can apply 12vdc to those
leads (I have used a 12v cordless drill battery) from a battery or other 12v
supply and watch to see if the antenna turns.
David Robbins K1TTT
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
> -----Original Message-----
> From: firstname.lastname@example.org [mailto:towertalk-
> email@example.com] On Behalf Of Bill Axelrod
> Sent: Saturday, March 08, 2008 16:21
> To: firstname.lastname@example.org
> Subject: [TowerTalk] G-2800DXA rotator doesn't rotate
> Help please. I have a Yaesu G-2800DXA rotator. I came home last weekend
> after a month's absense to find that my antenna is stuck pointing West.
> I don't know if the problem is in the rotator controller, the rotator up
> the tower, or perhaps in the PolyPhaser IS-RCT Rotor Control 8 Line
> Protector. I would appreciate some troubleshooting assistance.
> IS-RCT first. We had a lot of thunderstorm activity while I was
> I don't have any documentation for the IS-RCT. How do you test or
> troubleshoot the IS-RCT to see if that's the cause of my rotator outage?
> For the rotator itself. The Yaesu user manual doesn't seem to have any
> troubleshooting guidance. The controller turns on. The lights light. I
> opened it up and checked the internal fuse which is good. I can measure
> voltage between what I think are pins 4 and 5 on the output connector when
> press the button to turn the rotator. It doesn't turn. I'd like to be
> to check everything else out before concluding the problem is at the top
> the tower.
> Any suggestions?
> Thanks and 73... Bill K3WA
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