----- Original Message -----
From: "Tom Horton" <k5iid@ntelos.net>
To: <towertalk@contesting.com>
Sent: Sunday, January 27, 2002 20:33
Subject: [TowerTalk] Yaseu rotator
>
> Howdy,
>
> I hope someone here has experience with the little G-450XL Yaesu rotor.
> I have been having problems with mine.
I have had quite a bit of experience with the G-400RC box, I suspect very
similar.
> Had it down for a while and checked it out the other day and it worked
fine on
> the bench. Reinstalled it and it worked fine for a while.After several
> rotations,
> it quit again in the same manner as before. The previous problem was
> thought to be a bad cable. I repaired the cable and as I said above, the
> rotator worked.
>
> What it is doing now, as was the last time, when you press either the
> right or left direction
> switch, it sorta hangs there and then the indicator just takes off and
runs
> full scale around
> the face of the dial...BUT, the rotator does not move.
A 500 ohm pot is in the rotor and connects to pins 2 and 3 on the box. If
the pot goes open (or the cable) it will max out at one end. Sometimes they
stick there and you have to move the indicator back. The circuit design in
the 400 allows R1/Q1 or R2/Q2 to burn out if the control box is "ON" with no
500 ohm pot (or rotor) connected but this is another issue. HOWEVER this
has NOTHING to do with the rotor movement. The rotor circuit is completely
independent - a switch and 1 AC capacitor so you should get 28 vac between
pin 6 and 4/5. If the cable is good and the cap isn't bad, there isn't much
else to check.
>
> I really am at a loss as to what is wrong. I have spoken to some rotator
repair
> shops but no one except Yaesu works on these.
Since we are in Canada, it isn't of much help I guess, but we (Alfa Radio in
Edmonton Alberta) certainly don't consider the control box (again the
G-400RC has been my experience) as something hard to work on.
73 Don
VE6JY
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