[TowerTalk] Fwd: Fwd: (80 Meter yagi question) Cu <=> Ag

Patrick Greenlee patrick_g at windstream.net
Fri Oct 13 15:38:05 EDT 2017


...or polish the copper and coat with varnish or whatever new miracle 
coating replaced it.

Patrick        NJ5G

On 10/13/2017 2:21 PM, Bob K6UJ wrote:
> Howie,
> Thanks for the info.    I am trying to decide what material to use for a loading coil I will make for my 160 inverted L.  I was considering copper tubing and applying the silver plate stuff but now think it would be better to use aluminum tubing.
> 73,BobK6UJ
>
> Sent from Yahoo Mail for iPhone
>
>
> On Friday, October 13, 2017, 11:24 AM, Howard Hoyt <hhoyt at mebtel.net> wrote:
>
> Hi Bob,
>
> Two data points:
>
> 1) When I worked at a radio astronomy lab as a college student the
> engineers there said silver plating the machined copper cavities ruined
> their performance which I didn't understand at the time.
>
> 2) The broadcast equipment I maintain uses aluminum straps and tank
> components in the plate cavities and running at quite high powers the
> straps themselves seem to run cool, except for where they are tied to
> the anodes of the 4CXxxxxx tubes.  I believe they are intended to help
> pull heat away from the anode seal in that usage.
>
> If that study is to be believed, perhaps the silver-plating thing in ham
> equipment is a vestige of earlier manufacturing beliefs and techniques,
> plus corroded copper is difficult to clean and looks like hell?  Based
> on the study, lacquered polished copper or over-sized aluminum would
> appear to be the winner for coil construction.
>
> Howie - WA4PSC
>
>
> On 10/13/2017 7:06 AM, towertalk-request at contesting.com wrote:
>   >>Not trying to dispute the study but why then do amplifier
>   >>companies use silver plated tank coils in their amplifiers ?
>
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