Rick:
Thanks for reminding me about my favorite course in college: Filter
Design. I truly enjoyed that course because I understood how to use the
prototype designs to develop the response I needed, then calculate the
real-world R, L and C values. I wish I could find my course notes.
73 de
Gene Smar AD3F
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
Richard (Rick) Karlquist
Sent: Monday, April 18, 2016 3:46 PM
To: Jim Thomson <jim.thom@telus.net>; towertalk@contesting.com
Subject: Re: [TowerTalk] Triplexer
On 4/18/2016 8:06 AM, Jim Thomson wrote:
> ## I cant even begin to fathom the concept of a triplexer. It must be
> pretty complex, to be able to stuff 1.5 kw into say 20 + 10M , and
> RX on 15M !
>
> Jim VE7RF
>
This tutorial might be helpful so you can at least "fathom the concept":
http://www.n6rk.com/diplexer/diplexer.pdf
This discusses diplexers. However, the idea is extensible to triplexers or
quadplexers.
This theory has been known for around 60 years.
For further reading, see Wenzel's 1968 IEEE paper (search the IEEE site or
go to a college library).
I hope our European friends have read it!
I've designed diplexers for industrial RF plasma systems.
The power handling capability depends on a lot of detailed engineering
regarding circuit design, component selection, and cooling design. You can
design for any power level you want if you have the money, time and space.
Which is never unlimited, at least at the beginning.
Some of my clients have tried to take short cuts and then their system goes
up in smoke and they get to do it over again. Sometimes, they design for
"typical" instead of worst case. Sometimes the design doesn't have enough
theory behind it. Sometimes the design is OK but the recipe gets lost on
the production line. If this stuff were trivial, I wouldn't get consulting
work to fix it. I don't have any specific knowledge of this particular
design, but the "now with cooling fan" sounds very familiar.
Rick N6RK
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