[TowerTalk] Yaesu G-2800 problem with new unit

[Jon Zaimes]

I had a similar failure with an RT-21 and Yaesu G-1000 I was installing for
a client earlier this year. I forget all the details of the symptoms, but
bottom line was there was a problem with the internal wiring in the rotor.
It was replaced with a new one under warranty and all was well. But much
wasted time debugging.

73/Jon

Jon P. Zaimes, AA1K
Tower climber for hire
http://www.aa1k.us/
Cell: 302-632-2353

Reviews of AA1K tower work on eham website:
http://www.eham.net/reviews/detail/12922

Hug your favorite tower every day, and always stay connected to it.

-----Original Message-----
From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of
al.n6ta at gmail.com
Sent: Saturday, September 7, 2019 7:55 PM
To: towertalk at contesting.com
Subject: [TowerTalk] Yaesu G-2800 problem with new unit

I hooked up my brand new RT-21 Green Heron controller to a brand new G-2800.
On the ground thru the final cable.

The rotor will not turn and the GH controller says Error No Motion.  Lots of
checks and the motor winding is open, pins 4 and 5 on the rotor itself.

Upon initial test, I had no idea where the rotor was in its range.  The
RT-21 said 263 when it was turned up while being connected to the rotor.  I
used the point and shoot knob and set it to about 180 deg, the end of travel
limit, I believe.  While watching the rotor from 20' away, I saw it move
momentarily.  It has not moved since.

 

Looking at the documentation, I assume that the limit switches in the
rotator are open in some way that will not allow current to the motor.  Or,
that there is an internal wire failure or the filter unit PCB in the rotor
has an open.

I note that the internal potentiometer is at end of range at 500 ohms as
measured from pins 1 to 2 and 1 to 3 of the rotor.  Pins 2 to 3 is
essentially a short.

I believe the RT-21 is working fine and all the cable and connectors have
been checked till I am sick of testing!

 

I am hoping someone has some experience with this such that I can get it
going.    

 

Al

N6TA

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