Single transistor Carrier wave Tx

[Shaun]

Anyhoo, has anyone else built a very simple transmitter for model use they care to share....

Shaun

[Phil_G]

I dont have any of my Dad's homebrew S/C trannies, I remember one had a counterpoise wire dangling and wasnt crystal controlled, it had two bee-hive trimmers that could be set outside the 27mhz band, which is how we used to fly two superregens at once. He did make a crystal controlled one but I cant remember any details at all. By the time I was making stuff we had the Pixie and I never did make a S/C tranny. But here are two of my own propo homebrews from the 70s. The two-stick tranny has home-made stick units, from sheet steel, welding rod, switchboard plug sleeves and BT cable clamps! It used a variation of a magazine circuit (cant remember which) and a centre-loaded aerial:
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Immediately after this tranny I decided that what was really needed was a high-power set and
did an own-design single-stick with two PA's in push-pull. Never ever had range or interference problems with this one! It spent most of its days flying a Soarcerer.
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You can see the push-pull RF trannies with their heatsinks...
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Both cases were home-made too, folded from sheet ali and covered in some black vinyl my mum found,
hence all the excess Evo-Stik in the photos!
I still have both sets and they still work fine.