The 5-page article to which Ian (AKA 'Nick Sparks' whose cover is now blown!) refers, can be found here - pages 10 - 14:
https://www.bvws.org.uk/publications...letin_25_3.pdf
It radiates 500mW - 1 Watt depending on how it's set up, so we need to be mindful of the forum rule on discussing what are popularly called 'pantry transmitters', which states:
Quote:
F. Prohibited Discussions..
Small low powered transmitters with an output of less than 100mW e.i.r.p. for home use may be discussed in this forum.
The moderators will use their discretion as to what is acceptable.
Unquote.
Certainly an interesting design with a detailed description, including the setting up procedure, though given the time that's elapsed since it was published, sourcing some of the components might pose a challenge, albeit not insurmountable. Just a thought - given that the mini-mod is powered by a PP3 battery and is portable, which not just move it within range of whichever receiver on which it's wished to use to listen to its output - or even build more than one mini mod?