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Re: [TowerTalk] Yaesu G-800-S Rotator Question

To: "Pat Barthelow" <>,
Subject: Re: [TowerTalk] Yaesu G-800-S Rotator Question
From: Pete Smith <>
Date: Wed, 19 Jan 2005 16:31:09 -0500
List-post: <>
At 04:21 PM 1/19/2005, Pat Barthelow wrote:

The control box of our GS-800S rotator is not very user friendly, demanding attention for the duration of the rotation of the beam. The rotation speed though, is great...seems twice as fast as say, a Hygain Ham series... If you are swinging the beam a long fraction of a circlel, get distracted, and forget to stop at the desired heading, the rotator goes to the mechanical stop and, stops. The LEFT -RIGHT rotate switch is still depressed, with a mechanical latch.

Question 1:
If the switch is still depressed, when the rotor comes to it's mechanical limit stop, does the motor turn off, or does it continue to try to crank against the stop?

Funny you should mention this. I just posted another message on the subject. Honestly can't tell if the motor shuts itself off (maybe some sort of thermal cut-off) but I have accidentally left it with the switch on against the stop for hours without damage. Are DC motors different?

Question 2:
The left-right rotate rocker switch is bumped to the center posiition to stop rotation. there is a weak detent between the three positions available to the switch. If you are rotating clockwise and bump just a little too hard to center, off position, the switch may end up in counter clockwise rotation, instantaneously. If that happens, does the rotator have any delays, or graceful,safe way to reverse direction without putting huge stresses on the mechanicals? If not, I can see easily stripped gears, broken rotors, etc.. Yaesu service and parts makes extra money....

I suspect this problem is theoretical rather than actual, but maybe someone who knows more about DC motors can comment. I have had my G-800 for 5 years and am sure I have done what you describe any number of times without evident damage. Maybe there is some sequencing or delay in the controller.

I have thought seriously about swapping the locking switch for the non-locking variety. I believe that the G-800 DXA (preset model) has a non-locking switch (my G-1000DXA does) and it should not be hard to change it out. I sort of wish I'd spent the $50 additional for the preset model.

73, Pete N4ZR


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