[Hammarlund] Oscillation in HQ 180A

[Glen Zook]

Try loosening and then retightening all of the screws,
machine screws, nuts, etc., that you find.  All of the
grounds in the receiver are made through these
connectors (ground posts on terminal strips, etc.). 
The shields are also grounded through this same
technique.

Over the years these connectors work loose and/or
acquire corrosion.  Bad grounds can be the source of
intermittent operation and oscillations.

Just before Christmas my Collins 51J2 receiver got so
intermittent that I had to do something.  Virtually
every screw and nut in the receiver had become loose. 
By using a screw driver and a nut driver I tightened
every one of these.  So far, the intermittent has not
returned.

Over the years of working on equipment for others (as
well as my own) I have found in about 90% of the cases
that intermittent operations and quite a number of the
oscillation cases that the problem has been caused by
loose grounds.

Glen, K9STH


--- John King <k5pgw at yahoo.com> wrote:

I have a beautiful HQ 180A that has an oscillation in
certain knob settings.


=====
Glen, K9STH

Web sites

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


		
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