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
TPTG (Tuned Plate – Tuned Grid) Transmitter for 630M (472-479 kHz)
1920s/1930s style TPTG transmitter using a pair of 809s in push-pull.
Pine Base panel before staining; 12 in x 36 inContinue reading …..
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