Re: [TenTec] OT - Desk Microphone Switch Issue

["Bob McGraw - K4TAX" <RMcGraw@Blomand.net>]

In cases where there are very low level signals and at very low currents, 
there may be inadquate voltage to create a "punch through" where a coating 
of silver oxide exists.
Yes you are correct "silver oxide is ALMOST as conductive as silver".

73
Bob, K4TAX



----- Original Message ----- 
From: "Jerry Haigwood" <jerry@w5jh.net>
To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
Sent: Thursday, July 03, 2014 10:25 PM
Subject: Re: [TenTec] OT - Desk Microphone Switch Issue


> Bob,
>    I have always been told silver oxide is almost as conductive as silver
> and doesn't need to be cleaned like gold.
>
> Jerry W5JH
> "building something without experimenting is just solder practice"
>
> -----Original Message-----
> From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Bob 
> McGraw
> - K4TAX
> Sent: Thursday, July 03, 2014 10:21 PM
> To: Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] OT - Desk Microphone Switch Issue
>
> One easy and convenient way to clean relay contacts and key contacts is to
> use a common white paper business card.
>
> And better yet, if you have a friend that is an artist, get a scrap piece 
> of
> their acid free paper.  Cut it into strips, place one between the contacts
> and gently close the contacts and pull the paper out.  You may have to do
> this two or three times but you will end up with nice clean shiny contacts
> and a couple of black marks on the paper.  Oh, those black marks residing 
> on
> the paper are silver oxide.
>
> 73
> Bob, K4TAX
>
>
> ----- Original Message ----- 
> From: "K8JHR" <jrichards@k8jhr.com>
> To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
> Sent: Thursday, July 03, 2014 9:24 PM
> Subject: Re: [TenTec] OT - Desk Microphone Switch Issue
>
>
> > Hi Stuart - I appreciate your take on this.  And yet...     ;-)
> >
> > A)   The Caig web site is particularly clear using such solvents on such
> > switches is contraindicated.  It recommends against using solvents on
> > switches that employ porous phenolic wafer insulators.
> >
> > B)   While I appreciate the risk of filing down the metal... I am
> > confident my burnishing tool ...er... "barely scratched the surface." It
> > is not like I used coarse sand paper or a harsh metal file.   ;-)
> >
> > I considered using a non-abrasive metal polish, but that would have been
> > awkward and would likely get the insulating wafers wet, which was a
> > paramount concern.
> >
> > Happy days - OM.
> >
> > ----------------------  JHR ---------------------------
> >
> >
> >
> >
> >
> > On 7/3/2014 9:34 PM, Stuart Rohre wrote:
> > > DeOxit combines the cleaner, deoxide agent, and contact lubricant into
> > > one application.
> > > A burnishing tool should only be used if all else fails, as you are
> > > removing metal forever, if too vigorously used.
> > ___________________________________________________
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