OH NO!! Please, let's not start this again!!
73, Duane AC5AA
Duane A. Calvin
Server Systems Test Engineer
Dept. 76TS RS/6000 - SP Nodes
IBM Austin, TX >O< Tie: 793-3368
"Alex Mendelsohn" <alex.ai2q@worldnet.att.net> on 03/25/99 10:55:16 AM
Please respond to alex.ai2q@worldnet.att.net
To: tscott@eni.net, "'Ten-Tec Users Reflector'" <tentec@contesting.com>
cc: (bcc: Duane Calvin/Austin/IBM)
Subject: RE: [TenTec] Intermittent "Mass-Term" connections...
Tom:
Forget about the WD-40 vs Deoxit debate. Get ahold of some Stabilant-22 and
put it on your connectors. You'll say goodbye to intermittents forever.
Stabilant is a polymer that conducts between metallic surfaces and acts as
an insulator between dielectrics.
Vy 73, AI2Q, Alex in Kennebunk, Maine .-.-.
-------
Alex Mendelsohn, Editor-at-Large
Portable Design
Tel: 207-967-8812
Fax: 207-967-9756
email: Alex_Mendelsohn@portable-design.com
-----Original Message-----
From: owner-tentec@contesting.com [mailto:owner-tentec@contesting.com]On
Behalf Of Tom Scott
Sent: Wednesday, March 24, 1999 11:01 PM
To: 'Ten-Tec Users Reflector'
Subject: [TenTec] Intermittent "Mass-Term" connections...
I seem to be having continuing problems with intermittent connections in my
Omni V. In particular, I suspect that the "mass-term" connector #58 on the
IF / AF Board (81462), may be intermittent. Even though the rig just came
back from Ten-Tec service; recently the "S" meter just went dead for a few
days, and now for the last day or so it is back working normally again.
So, operating on the assumption that the mass-term connectors are indeed
the
culprit; has anyone had success with attempts to re-tension the female
contact springs? I have successfully done this with other kinds of
connectors, but have not tried that yet with these or looked at them
closely
to decide if that is feasible. With some connector types I have been able
to
take a needle or other slender tool and wedge it into the connector between
the connector shell and the outside of the female contact and then pry the
female contact spring to close it more tightly. It has been my experience
that these contacts can develop a "set" to them over time that prevents
adequate contact surface pressure to keep the contact area " gas-tight". In
this case, normal pollution and oxidation build up eventually creates
havoc,
especially with low level signals.
I really don't want to re-open the WD-40 vs Deoxit debate, but I should
acknowledge that an anti-oxidant treatment is also a good idea, but may not
be sufficient if the contacts have become sprung and don't mate with enough
tension.
I have a new #217 filter that will be arriving soon (yes I finally found
one, now I only need a 282...). When I get the new filter and crack the
case
to install it, I thought I might go through and carefully see if I can
improve all of these mass-term connections with a process something like
this:
1. remove the female connector
2. clean the male pins with a "Q" tip and alcohol or other solvent,
repeatedly pushing the cotton pad onto the pin
3. clean the female contacts with a blast of solvent (with a rag to catch
the over-spray!)
4. re-tension the female contacts as described above
5. apply a small dab of (anti-oxidant treatment of your choice; Deoxit in
my
case) to each male pin
6. re-attach the connector
Any opinions / suggestions about this procedure?
Thanks and 73's all....
- Tom
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
Tom Scott - Wyle Electronics - KD7DMH
10300 SW Nimbus Ave #PB, Portland, OR 97223
503-603-1931 - TEL 503-684-6620 - FAX
503-504-1583 - Cell 503-604-8651 - Pager
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
--
FAQ on WWW: http://www.contesting.com/tentecfaq.htm
Submissions: tentec@contesting.com
Administrative requests: tentec-REQUEST@contesting.com
Problems: owner-tentec@contesting.com
Search: http://www.contesting.com/km9p/search.htm
--
FAQ on WWW: http://www.contesting.com/tentecfaq.htm
Submissions: tentec@contesting.com
Administrative requests: tentec-REQUEST@contesting.com
Problems: owner-tentec@contesting.com
Search: http://www.contesting.com/km9p/search.htm
--
FAQ on WWW: http://www.contesting.com/tentecfaq.htm
Submissions: tentec@contesting.com
Administrative requests: tentec-REQUEST@contesting.com
Problems: owner-tentec@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|