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!
NO3M
Amateur Radio
Tag: 811 (page 1 of 2)
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
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.
160M Four Square + 630M Vertical
1930s PP 814 Transmitter
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