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Re: [Amps] Silver Strap

To: Missouri Guy <n0tt1@juno.com>
Subject: Re: [Amps] Silver Strap
From: Larry Benko <xxw0qe@comcast.net>
Date: Tue, 08 Jul 2008 17:22:58 -0600
List-post: <amps@contesting.com">mailto:amps@contesting.com>
Folks,

I used to think silver plating was a big deal until I ran a bunch of 
tests.  See http://www.bnk.com/W0QE/inductor_Q_tests.html  for the 
results.  Silver is only 7% better than copper and with reduced 
resistance comes reduced skin depth resulting in only about a net 
difference of 4%.  Lore has it that the corrosion on copper increases 
the resistance but my tests did not show that to be true for copper I 
oxide (reddish brown), copper II oxide (black), and copper carbonate 
(blue green).  If you really want the coil to look good for a long time 
just paint it with some glossy high temp enamel spray paint which has 
absolutely no effect at HF.  A "real" amp should have a "fire engine" 
tank circuit.

73, Larry, W0QE


Missouri Guy wrote:
> If nothing else, there's a rub-on silver-plating powder
> available.  Also, I remember seeing an article in QST
> on how to do your own real silver plating.
>
> I like the silver plating too, but to retard corrosion.
>
> Charlie    N0TT
>
> On Tue, 8 Jul 2008 13:57:08 -0400 "Bob Maser" <bmaser@tampabay.rr.com>
> writes:
>   
>> But silver plated inductors look so classy.  Using bare copper is 
>> tacky, 
>> shows poor moral fiber.  Of course gold plating would look good too 
>> but I 
>> prefer the understated elegance of silver appearance.
>>
>> Remember, in CA too much power is just enough.
>>
>> Bob W6TR
>> ----- Original Message ----- 
>> From: "David Cutter" <d.cutter@ntlworld.com>
>> To: "Jan Erik Holm" <sm2ekm@telia.com>
>> Cc: "AMPS" <amps@contesting.com>
>> Sent: Tuesday, July 08, 2008 1:49 PM
>> Subject: Re: [Amps] Silver Strap
>>
>>
>> I've read that silver plated coils encourage VHF and UHF 
>> oscillations.
>>
>> David
>> G3UNA
>>
>> ----- Original Message ----- 
>> From: "Jan Erik Holm" <sm2ekm@telia.com>
>> Cc: "AMPS" <amps@contesting.com>
>> Sent: Monday, July 07, 2008 9:19 PM
>> Subject: Re: [Amps] Silver Strap
>>
>>
>> Silver! What a waist! After all it´s only 28 MHz.
>>
>> / Jim SM2EKM
>> ----------------------
>> k7rdx wrote:
>>     
>>> Try: www.freng.com Frontier Engineering..I purchased silvered 
>>>       
>> strap from
>>     
>>> them a few yrs ago for a very reasonable price..73,Jim..K7RDX..
>>> ----- Original Message ----- 
>>> From: "Bob Maser" <bmaser@tampabay.rr.com>
>>> To: "AMPS" <amps@contesting.com>
>>> Sent: Monday, July 07, 2008 9:15 AM
>>> Subject: [Amps] Silver Strap
>>>
>>>
>>> Anyone have some silver strap they can spare?  I need enough to 
>>>       
>> make a 10M
>>     
>>> coil for the B&W 852 and need some to route the RF around.  5 feet 
>>>       
>> would
>>     
>>> do
>>> me.  It should be ±1/2" wide and ±.040" thick but beggars can't 
>>>       
>> be
>>     
>>> choosey.
>>>
>>> Bob W6TR
>>>
>>>       
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>>     
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