[Heathkit] HW 101 problem

[sbjohnston at aol.com]

>When I get close to 5/8ths of the way on the rf out meter scale it
>jumps and pins the meter then it also starts arcing
>On the side of the final tuning center section of the capacitor  to 
the frame.

Could there maybe be a bit of stray metal (wire, plating, etc) in 
between the plates of the capacitor, or could there be a plate bent a 
little bit so it is touching its next door neighbor when you reach that 
point in the rotation?  You can test this using an ohmmeter or 
continuity tester.

WITH THE POWER OFF AND THE AC CORD UNPLUGGED, Hold one lead on the 
frame of the capacitor (which should be connected to the rotor) and the 
other on the terminal on the side of the capacitor (or on the edge of 
one of the stator plates).  Rotate the knob - it should be an open 
circuit (high resistance or infinity) at all times.  If it shows a 
short circuit (Close to zero ohms) at any point take a close look and 
see if you can find the spot that plates are touching.

Steve WD8DAS

sbjohnston at aol.com
http://www.wd8das.net/
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-----Original Message-----
From: Jim Fisk <w0jlf at msn.com>
To: Heathkit at mailman.qth.net
Sent: Thu, 23 Apr 2009 8:28 pm
Subject: [Heathkit] HW 101 problem

I am working on my HW101, it has developed a problem when tuning up

When I get close to 5/8ths of the way on the rf out meter scale it 
jumps and
pins the meter then it also starts arcing

On the side of the final tuning center section of the capacitor  to the
frame.

If I stop tuning before arcing starts unit seems to transmit O.K.

The only thing that has changed lately in the system is a rebuild of the
power supply about 6 months ago.

Do I have a 6146 going bad?

Any ideas?

Thanks

Jim









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