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Auto transformer for 160m inverted L

Jan 2nd 2016, 23:18

N4UL

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
I bought one of these many decades ago at a hamfest. It was homebrew, made inside 6" PVC pipe, and had stainless hooks top & bottom for mounting. It also had a UHF (SO-239) connector for connecting coax. I installed it with 135' of wire in an inverted L, approximately half verticle, half horizontal.

It worked great on both 160m & 80m, in that I won the ARRL 160 Contest using it back in the 1990's. I also used it on the Geratol Net on 80m, working Alaska!

It was totally destroyed, but want to put up a similar antenna. I cannot find any information about making the tapped auto transformer, however. Any help?
Jan 3rd 2016, 06:11

W1VT

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
See page 24-36 of the ARRL Antenna Book 23rd edition for an old autotransformer design using a ferrite core--it is also in earlier editions on a different page.

Here is a study on different transformers
http://www.karinya.net/g3txq/unun/

Zack W1VT

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