Thanks for the recommendation. FYI, the problem is history and noted in
my other posting. The combination of spraying the Calibrate pot and
fixing where he lamp was shorting to the case FIXED the problem. It now
works like new. I used the RS cleaner but will keep the deoxit in mind
for other projects. At least I did not have to climb the tower to fix
the problem

dick aa5vu

In article ,
"Jimmy" wrote:

WD40 is awful, Get the deoxit.
"Dave Platt" wrote in message
...
I wonder if there is anything other than the $8.95 Radio Shack contact
or tuner cleaner that can be used on the Control Unit 'Calibrate'
control? How about WD-40 or sylicon spay dry it out with air?

I've heard that WD-40 tends to become gummy after some amount of time,
and can attract and hold dust and grit. Probably not what you want
for electrical contacts.

I often use Caig DeOxIt for this sort of cleaning / lubrication /
treatment process.

By messing with it the meter sometimes displays the correct location of
the beam. Per the previous responses I realize the problem is probably
with calibration control located in the rotor - I am not ready to climb
the tower and remove the rotor. That is big deal!

If the actual problem is a messed-up position pot / sensor in the
rotor, then it's likely that nothign you can do down at the control
box is going to make much difference. I'd guess that by operating the
"calibrate" switch at the box, you may be sending some small voltage
or current spikes up the wire to the sensor, and temporarily bridging
over the grid or dirt or oxidation or whatever else is fouling the
sensor. If this is the case, the only real remedy is to clean or
replace the fouled sensor.

--
Dave Platt AE6EO
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