630M – Page 3

Category: 630M (page 3 of 5)

1936 Homebrew Exciter

Tubes

89 Hartley ECO

802 Buffer

Band Coils: 630M, 160M, 80M, 40M, 30M, 20M, 15M

630M MOPA 809 + 811

August 19, 2014 / admin / 0 Comments

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

Another 630M Hartley transmitter

June 23, 2014 / admin / 0 Comments

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.