I have a Centurion and mine is open now as I am working on it. I
have not focused on the band switch because I have not had to yet
(fortunately). It looks like a PITA to replace.
That switch is a custom job consisting of two wafers, one a standard
ceramic RF band switch type and the other a PC card material wafer
that is attached to a printed circuit board that is mounted on the
switch and is used to select the necessary tuned input circuit for a
given band. That's the part that you will probably have to get from
Ten Tec, unless you want to disassemble the amp and build it back up
so it is functioning, but in a different way (YOUR way).
The RF pi output network band switch part, i.e. the ceramic wafer at
the rear of the switch is probably a Centralab or Multi-Tech. It
looks like it is 2 inches or a little over 2 inches diameter.
It has 18 terminals, so it is 20 degrees, but 6 band positions. There
are two bundles of shorting spokes, and they are separated by 100
degrees in both directions. One bundle consists of 6 shorting spokes
20 degrees apart; the other bundle consists of 2 that are shorted (all
8 bonded to each other) and also 20 degrees apart.
You can search for switches here:
http://multi-tech-industries.com/rswitches.html
http://www.electro-nc.com/rotarysearch.php
(Centralab is now Electro.)
It's not clear to me what you need--if all you need is the ceramic
wafer with the 18 contacts then you may be able to find that on-line
somewhere--that's probably the easiest thing to find. You have to
get the switch out and measure it. The rest of it is odd enough to
probably be a custom job. If you need the Ten Tec built pc card part
of the switch, you will probably have to bite the bullet and pay them
for it.
Or you can study the schematics and manual and figure out what the Ten
Tec part switches, and work out a scheme to do that some other way,
and use the rotary switch only for the output pi network.
73
Rob
K5UJ
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