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From: pcf@galadriel.bt.co.uk (Pete French)
Newsgroups: sci.electronics
Subject: R.F. transformers
Message-ID: <498@galadriel.bt.co.uk>
Date: 1 Nov 89 09:17:33 GMT
Organization: RT6115, BTRL, Martlesham Heath, England
Lines: 28


A simple problem - I need to make (or buy) tranformers to operate at 999kHz
to split powqer R.F. from a main feeder into several sub-feeders in the ration
I want - this is normally 1 in with 4 out equally, but some points in the
system need 1 in and 2 out split 2:1 between them.

Both the inputs and outputs must be matched to 50 ohms.


A simple enough requirement, I even have a design that has been in use since
the early 70's on the ssystem - eexcept that nobody makes thee cores
anymore.

So I need a new design ... and there seems to be nowhere that can help me do
it. We have contacted firms all over the U.K. that do custom design. None of
them can do it. We have asked electronics lecturers - none of them can do it.
We have looked in text books - they all say how to wind the things, but
tactfully avoid mentioning how to match input-output to 50 ohms. This seems
to be the major sticking point.

Help ! (please)

-Pete.
-- 
       -Pete French.               | "It was cold,
  British Telecom Research Labs.   |  and the person beside him
 Martlesham Heath, East Anglia.    |  had faded badly..."
All my own thoughts (of course)    |                     -BAUHAUS