Xref: utzoo rec.ham-radio:5421 sci.electronics:3348
Path: utzoo!attcan!uunet!lll-winken!lll-lcc!unisoft!gethen!abostick
From: abostick@gethen.UUCP (Alan Bostick)
Newsgroups: rec.ham-radio,sci.electronics
Subject: Re: monimatch?
Message-ID: <1076@gethen.UUCP>
Date: 17 Jul 88 22:45:39 GMT
References: <25048@ucbvax.BERKELEY.EDU>
Reply-To: abostick@gethen.UUCP (Alan Bostick)
Organization: There's Unix there in Oakland
Lines: 38

In article <25048@ucbvax.BERKELEY.EDU> bks@ucbarpa.Berkeley.EDU (Brian K. Shiratsuki) writes:
>i'm interested in building an swr meter to use on amateur hf
>frequencies.  a chapter of the 1962 edition of the Radio Amateur's
>Handbook features an antenna tuner which includes a foward/reflected
>power meter, which is driven off something called a ``monimatch.''
>since they give instructions on how to construct this device (it
>looks like a four inch length of small copper tube, flanked by two
>wires, with two strips of copper outside the wires.  the rf signal
>passes through the copper tube), is it reasonable to assume these
>weren't available commercially?
>
>the meter itself is driven from a diodes attached to either of the
>two wires, depending on whether you want to read forward or reflected
>power.
>
>are there better ways of making an swr meter 26 years later?  is
>there a place to buy items like the ``monimatch?''
>
>				brian


Why bother constructing such a thing when you can buy them, or at least
the parts that go into them, ready-made?

Minicircuits, a manufacturer of LOTS of nifty RF and microwave devices,
has a line of "directional couplers"  little (about 1 inch on a side)
boxes with three BNC connectors on them.  Signals going in one direction
go from one port to the second, and signals travelling in the other
direction go from the second to the third port.  They are truly clever
devices, based on diodes.  I am told that they are similar in design to
stuff which appears in  ARRL handbooks, and may in fact be what you are
talking about.

Sorry, I don't have Minicircuits ordering or catalogue info on hand.
Check with a serious electronics supply store, or the catalogue shelf of
just about any good electronics lab that works a lot with RF.

				Alan Bostick
				ucbvax!unisoft!gethen!abostick