[TenTec] OT - Desk Microphone Switch Issue

[Bob McGraw - K4TAX]

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 at w5jh.net>
To: "'Discussion of Ten-Tec Equipment'" <tentec at 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 at 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 at k8jhr.com>
> To: "Discussion of Ten-Tec Equipment" <tentec at 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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>
>
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