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Gallery, Projects and General => Gallery => Topic started by: John Hill on August 25, 2011, 01:28:50 AM

Title: Amateur radio, recycling junque from the junque box!
Post by: John Hill on August 25, 2011, 01:28:50 AM

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.

Title: Re: Amateur radio, recycling junque from the junque box!
Post by: Marauder on August 25, 2011, 04:13:31 AM

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--

Title: Re: Amateur radio, recycling junque from the junque box!
Post by: John Hill on August 25, 2011, 03:45:16 PM

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.

Title: Re: Amateur radio, recycling junque from the junque box!
Post by: hopefuldave on September 10, 2011, 10:49:19 AM

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...