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630M MOPA at Dayton

The 630M MOPA (89/802/811) was displayed at the Dayton Hamvention as part of the homebrew theme this year.  Plenty of questions were asked and photos taken like the one below!

radio

630M MOPA 809 + 811

630M MOPA (Master Oscillator – Power Amplifier) consists of an 809 “High-C” Hartley capacitively coupled to a push-pull power amplifier, either running 809s or 811s.

Power output is on the order of 100-165W with 1600V on the amplifier tube plates.  CW note is clean and stable (slight chirp reported over the air).

Recording: 630m-MOPA-single-2014-10-22-2.mp3

mopaContinue reading …..

Another 630M Hartley transmitter

Classic Hartley transmitter using an 811 tube.  Aprrox. output 45-65W (depends on coupling).

Rig is mounted on a 21 in. L x 18 in. deep board, cut from a 48×18 prefabricated, edge-glued shelf board from big-box home improvement store.  Stained with dark walnut finish.

630m-hartley-4Continue reading …..

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