MadModder
Gallery, Projects and General => Gallery => Topic started by: John Hill on August 25, 2011, 01:28:50 AM
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The local club station needs an HF transmatch, so into the junque box to see what could be cobbled together..
(http://farm7.static.flickr.com/6181/6078424905_cd5dceb749.jpg) (http://www.flickr.com/photos/25239206@N06/6078424905/)
IMGP9365 (http://www.flickr.com/photos/25239206@N06/6078424905/) by aardvark_akubra (http://www.flickr.com/people/25239206@N06/), on Flickr
(http://farm7.static.flickr.com/6185/6078964028_7d4e7208ba.jpg) (http://www.flickr.com/photos/25239206@N06/6078964028/)
IMGP9364 (http://www.flickr.com/photos/25239206@N06/6078964028/) by aardvark_akubra (http://www.flickr.com/people/25239206@N06/), on Flickr
Totally untested but I hope the tuning range is adequate to handle the long wire that is being put up.
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Looks very nice from one Ham to another,Reminds me of a commercial transmatch i had several years ago worked well on long wires, always regretted getting rid of it.Let me know how you get on with it. G0 C--
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Hi, the circuit is based on the Ultimate Transmatch as appeared in ARRL Handbook for many years. The original circuit had a very wide range but I am unsure if the coil from an old ARC5 transmitter will have enough inductance for 80 metres, time will tell.
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Maybe add another fixed inductor (or a pair) for 80 / 160M to the earth end of the rollercoaster, short with a Big Ceramic Switch when not required?
Dave H. (The other one) a.k.a. G0IZY but too busy with machines to get on the air...