To promote and explore the hobby of amateur radio. Providing quality training for all amateurs and in all aspect of the hobby.
M0VGA's picture
Sat, 05/03/2016 - 16:54 -- M0VGA

Posted on behalf of David Cutter, G3UNA. (Chairman, Ripon & District Amateur Radio Society)
Mainly for radios without a separate RX aerial input. This is the simplest and smallest version. I chose to use the relay that W6PQL uses on his projects: see his website www.w6pql.com which has many other fascinating projects.
The W6PQL method was used to improve isolation - see circuit diagram picture.
Mounting in a 2oz tobacco tin provides good screening and space for lots of circuitry, eg filters, receive amplifier, protection circuitry, decoding, bias T.  NB the height is slightly compromised, ie  it will bow the tin slightly; pcbs can be mounted and stacked sideways. See tobacco tin picture.
Please get in touch if you'd like to know more.
73 from David G3UNA.
@G4SJM