From: John Woodgate
Subject: Re: 2 way Splitter
Date: Tue, 17 Dec 2002 22:52:38 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Tue, 17 Dec 2002 23:20:57 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Simon
wrote (in <email@example.com>) about '2 way
Splitter', on Tue, 17 Dec 2002:
>I'm having difficulty designing a 50 ohm, 2-way, zero degree phase
>I've seen them manufactured by people like mini-circuits, but I need a
>greater bandwidth than they build (I require low loss at 375kHz and 50
>MHz, but don't care about stopband performance, or performance in
>between these frequencies)
>I was told to do it using three resistors but don't know where to
>start. I assume each "port" would look like 50 ohms, but am not sure
>how to og about it.
Three coaxial connectors mounted on a metal box, one IN and two OUT. You
have a choice. Either connect three 50 ohm resistors (47 or 51 are quite
good enough for jazz) in an equilateral triangle between the three
centre contacts, or wire three 16 ohm (15 ohm are OK) resistors in a
3-pointed star and connect each free end to a centre contact.
To get the best results at 50 MHz, you need either carbon composition
(UGH!) or *unspiralled* metal film resistors, which are not so easy to
obtain. But ordinary parts may be good enough.
Now learn the star-delta theorem and you WILL understand how to go about
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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