[MRCA] [Milsurplus] BC-611 PTT help

[Robert Downs]

The first step is to determine whether the problem is with the rubber PTT
Actuator cover, the PTT Actuator or the PTT switch.

The rubber cover should be able to stand up on its own but not much more
than that.  The rubber should still be quite flexable.

With the rubber cover over the actuator removed and the chassis pulled out
of the case, it should take almost zero force to operate the switch actuator
and to pull it back up.

Compare the springs on the two switches.  If that isn't it, unhook the
spring if you can and figure out whether the problem is being caused by the
phenolic strip assembly that the movable switch contacts are mounted on or
by one or more of the fixed contacts.    

Robert Downs

-----Original Message-----
From: milsurplus-bounces at mailman.qth.net
[mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Gene Smar via
Milsurplus
Sent: Wednesday, May 20, 2020 19:41
To: MRCA at mailman.qth.net; 'List Milsurplus'
Subject: [Milsurplus] BC-611 PTT help

Gents:

     I have a pair of -611s that I intend to bring to various demos such as
MRCA, RCA (the Club, not the Company), Ham club meetings, etc.  My latest
acquisition is a 1945 Galvin model F and it seems to work just fine.  The
other is made by Nippon Electric in 1953 but its PTT switch operates very
sluggishly.  That is, it requires quite a bit of force to get it to move
from RX to TX.  I removed this -611's PTT switch assembly and cleaned it
quite a bit with dry polishing.  It's still tough to operate.  

     Have you any suggestions on how I might be able to free up the movement
of this switch?  I don't want to exhibit it in front of an audience when
they won't be able to operate it easily.  Would contact cleaner on the 14
switch poles be advisable?  

     Thanks for any guidance you can provide.

73 de
Gene Smar  AD3F


______________________________________________________________
Milsurplus mailing list
Home: http://mailman.qth.net/mailman/listinfo/milsurplus
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Milsurplus at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html