[TowerTalk] Yaesu 2800 issue

[Grant Saviers]

I wonder if it is the connector or the pot that is intermittent.  A 
couple of tests that might help are to check the total pot resistance - 
500 ohms - if stable that verifies those two connections. Then the 
stability of the wiper to each end of the pot which can't distinguish 
between a bad wiper or a bad connector but can between either end wire 
connection problems.  I'd use a classic metered VOM to watch for needle 
twitch and to put some current into the system.

It takes less than 12v to get motion so a bench power supply can move 
the rotator for the testing (assuming your rotators are the DC motor 
versions).

Replacing a pot is a bit tricky and the pot must have enough electrical 
and mechanical travel, it's not a standard volume control.

Grant KZ1W

On 8/28/2022 18:22, Bill via TowerTalk wrote:
> I have 5 Yaesu 2800s  and have an issue with one at 80 feet.  All others operate normally.  The one at 80 feet has indicator issues.  Shows wrong direction of rotation sometimes (CCW vs CW), slow to no rotation at times...generally flakey.  I have runs to the rotor cable from the shack out to the  box under the tower and have terminal strips which allow me to switch out the cable and boxes.  So basically UI ran a different box and cable to the tower and then to the rotor in question.  No change.  So I know the  issue is from the box at the base to the rotor.
> I know water incursion is an issue with the 2800s, so when I installed the rotors last year I used a high quality caulk on the plugs.  However, my guess is I've got water seepage into the connector.
> Any thoughts on this and the best way to "dry it out" ?  I know I have to remove the cable connector to do it, but any suggestions for solving the rotor issue would be appreciated.
> Bill V31XX/KH7XS/K4XS
> 
> 
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