I had a set of copper copper pipe duplexers for 220 years ago. I thinnk they were 4 inch in diameter. I had a stability problem due to temperature changes. They required a "winter tune" and "summer tune" twice a year. I used them for several years and the taught me why I neede to find a good set of duplexers. I learned alot from those cans.
I contemplated the PC board cavities, but heard that they were even more unstable than the copper pipe.
There was some scheme to silver plate the PC boards using DC current, some sort of solution, and silver coins. The plating was extremely thin, but did work.
73, Joe, K1ike
Randy & Karen Long <[EMAIL PROTECTED]> wrote:
Randy & Karen Long <[EMAIL PROTECTED]> wrote:
Ed,
I have a set built out of the May 1973 QST... With few modifications they
work as well or better than the Wacoms or Cellwaves I have used. Am
currently sourcing some 4" type L copper now to build more. If you have mort
time than money, you can come up with duplexers that may not always be the
prettiest, but darn functional.
QST also had an article I am looking back to see if I can find, that if I
recall is called the "Six-pack". Its made from double-sided PC boards and
then plated with Silver as a part of the construction. I have not talked to
anyone who has used them, or even built them, but certainly am looking at
them for a repeater that we can back pack to its destination.
Randy, W0AVV
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