[CQ-Contest] Yaesu G-450 Rotor question

Jukka Klemola jpklemola at gmail.com
Tue Jun 18 04:02:47 EDT 2013

Is there a rubber belt mechanism moving the needle?

If all mechanics is rugged, you write you have checked the connectors.
See also internal connections .. maybe with a voltage meter parallel to the
rotator when it is operational.
If that is good, then see the electronics inside the control box.
Start there with connectors and then cold solder jonts.

About electronics, the most typical failure is the comparator .. but the
symptom the comparator shows is permanent.
Your device's failure mode is intermittent.

Jukka OH6LI

2013/6/18 KU7Y <ku7y.cw at gmail.com>

> I have been given a G-450 rotor that has a problem.
> The indicator needle acts like it has a mind of it's own!  Sometimes it
> track the rotor, for several degrees and then stop.  Sometimes it will just
> sit there "shaking" back and forth between CCW and CW.  Sometimes it will
> go from CCW to CW while the rotor is still moving in the CCW direction.
>  There is no pattern to what it does.  At least none that I can spot.
> The rotor part turns as it should.
> I have checked, with an ohm meter, both pots.  Then both change resistance
> as they should with no jumping around.  All wires check out OK.
> Has anyone else seen something like this and if so, what was the fix?  I
> really don't want to spend the money sending it back Yasue for repair!!
> And all I have left to trouble shoot with is normal multi meters.
> Thanks for any hints....
> OK, back in my hole,
> Ron, KU7Y
> SOWP 5545M
> Arizona Outlaws Contest Club
> Silver Springs, NV
> ku7y at qsl.net
> http://www.hatpinsandmore.com
> KX3 #0062
> DM09ji
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