Mini-Mod MW 'Micro Transmitter'

[Yorkie]

I've got a couple of designs for valve pantry transmitters, one by our own MurphyV310, but have never built them as I don't trust them as regards harmonics.

— Joe

Thanks for posting those Joe.

Both of those designs are quite 'chunky'.

Trevor's scope traces  look good!

Peter Lankshear is a well-known Australian vintage radio enthusiast and keen constructor who's written many articles over the years, as well as books. EG:

http://trove.nla.gov.au/work/34943211?se...NBD9156751

I guess that given the limited range (on a short aerial), low power and the fact that so few people listen on MW these days, the risk of radiating harmonics to such an extent that they cause interference and annoyance to other spectrum users is fairly minimal. For now, I'm quite content with the performance of the mini-mod, which has the merit of being compact and running off a PP3, and with so many half-completed projects on the go,  my autumn/winter mission is to complete those before going off on a frolic experimenting with valved micro transmitters

Interesting topic though.