I built some notch filters out of 1-5/8 heliax as described on WB5WPA's page.
They worked very well, only I was having some problems with drastic changes in
temperature. The would be fine in an air-conditioned and heated environment.
I have decided to go with a vertical separation instead of duplexers for my
project, based on the ideal tower situation I have been handed that would not
have given room for such bulky items anyway. But I would recommend this type of
design for anyone who wants to build a duplexer the easy way.
Tools needed: soldering gun, hack saw, frequency generator (I used the MFJ
antenna tuner, and did final tuning with exciter power from an old mobile.)
Spectrum monitor if you know where to get one, but you can use a receiver with
an attenuator and a s-meter. Check out the website that was mentioned earlier:
http://www.dallas.net/~jvpoll/dup6m/dup6m.html
It told me everything I needed to know. I will be happy to talk with anyone
interested in doing this. Heck, I'll even give you a set tuned to 51.7!
John Clark - KI4AWK
Thomasville, GA
[EMAIL PROTECTED]
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