[Hallicrafters] Re Contact Cleaner

[David Harmon]

My experience is the same as Glen's. 
For sure what you don't want to hear is the wafers grinding away like it
was gnawing on a bone.
This is one of the very first things I do when I service a radio. 
Lube the switch detents and clean and lube the band switch wafers.
Then, troubleshoot the rig.

A good percentage of the time, servicing the band switch will fix the
damn thing!
If the wafers still grind a bit, I use a toothpick or dental pick and a
little Vaseline around the circumference of the rotating wafer.
Not all wafers require this, just the ones that are a little out of line
with the band switch shaft.
If this grinding is severe, I reinsert the shaft and then loosen the
mounting screws for the wafer in question, let it take its own alignment
and then tweak for quiet operation, then tighten the mounting screws.
Usually, one or more of the above will stop that grinding.

Personally, I feel that the bit about the wafers coming apart and
conducting is just voodoo 'lectronic theory spouted by those who
listened to someone before them spouting the same thing.

Ya gotta know who you should listen to.
I have never seen anything written by Glen that I didn't agree with and
his well written technical descriptions of procedures and techniques are
very similar to my own experience.

Here's a well deserved tip of the XYZ hat to the guy with the funny
name!!


Regards

Dave Harmon
NSRCA 586
K6XYZ[at]comcast[dot]net
Torrance, Ca.

-----Original Message-----
From: hallicrafters-admin at mailman.qth.net
[mailto:hallicrafters-admin at mailman.qth.net] On Behalf Of Duane Fischer,
W8DBF
Sent: Saturday, January 31, 2004 5:09 PM
To: Glen Zook; hallicrafters at mailman.qth.net
Subject: Re: [Hallicrafters] Re Contact Cleaner

Yea, right Glen. Guess you never ate an Oreo, heh? (chuckle)	
	
I am not going to take issue with you on this, but so far when it comes
to wafer
switches you are a minority of one who believes that a lubricant soaking
into
the material is not a problem. Maybe several on the list can help to
establish
this as problematical or not? Everytime I hear it said on the air, they
disagree
with you Glen. It is not important who is right, but it is important the
procedure is correct.	
	
Maybe some of those knowable techs will chime in and relate their
experiences to
help clear this up - 	


----------
From: Glen Zook <gzook at yahoo.com>
To: Duane Fischer, W8DBF <dfischer at usol.com>;
hallicrafters at mailman.qth.net
Subject: Re: [Hallicrafters] Re Contact Cleaner
Date: Saturday, January 31, 2004 7:59 PM

I have never had a wafer come apart!  I have never had
a problem with conductivity!  Some people may have had
problems, but I can only speak from my experience.

You need some sort of lubricant on the switch.  If the
switch is completely dry, then all sorts of problems
can happen in a hurry (like the switch "binds" - won't
rotate freely).

Now, you don't "soak" the switch, but by using the
little red plastic tubing that comes with the WD-40,
you can direct the cleaner to where it is needed.

Frankly, you would have to really soak the wafer (like
spraying it for 20 to 30 seconds) before you are even
going to think of getting enough on it to cause
problems.  The "non" lubricating types can cause
problems with the wafers if you soak them as well. 
Just use a little common sense and you won't have any
problems at all!

Glen, K9STH


--- "Duane Fischer, W8DBF" <dfischer at usol.com> wrote:
 	
What about the wafer switch issue? You do not want
lubricant soaking into them, reduces conductivity. 

=====
Glen, K9STH

Web sites

http://home.comcast.net/~k9sth
http://home.comcast.net/~zcomco

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