Correct - I used to work for Wingrove and Rogers in the UK, the leading
tuning capacitor manufacturer (eventually went bust and bought by
Jacksons). I learnt from their industrial chemist that decorative (shiny)
silver plating is bad for rf. They used a special matt silver plating
process. The plating baths ran some fairly hefty currents but at a low
voltage, can't remember the details now. The base coat was pure copper
onto the brass parts.
I was once told that soft solder used to fasten the parts together produced
a black line on the surface when silver plating was applied on top of it.
The base coat of copper stops this.
John ZS5JF
----------
|
| I've learned from this guy that a "matt" finish is far superior to a
| "mirror" finish for rf work - apparently better conductivity and
longevity,
| and the film is thicker which is important for rf. Mirror finish is good
| cosmetically, but not AS good as matt finish for rf. I recently looked
| inside an AL-1200 and saw that the tank L had a matt finish.
|
| Phil
|
|
|
|
| --
| FAQ on WWW: http://www.contesting.com/ampfaq.html
| Submissions: amps@contesting.com
| Administrative requests: amps-REQUEST@contesting.com
| Problems: owner-amps@contesting.com
| Search: http://www.contesting.com/km9p/search.htm
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|