I recently purchased a one-tube hb xmtr off of ebay and I'm wondering
about its origins? I seem to recall this circuit being published
somewhere...maybe in a newer publication?

Uses an 802 tube which is not a very common choice. Mine is new era
construction and well built. Don't think I'll have any problem firing
it up but mainly my curiosity is after me to recall where I saw this
particular circuit?

Ring any bells?

-Bill

The 1938 Radio Handbook (page 301) has a Reinartz Crystal Oscillator which
uses an 802 tube. It features a tuned cathode circuit at 1/2 the frequency
of the crystal. In that circuit, keying is in the screen. It featured low
crystal current and high efficiency. Reinartz never minded re-inventing the
wheel to get improvements.

I think there may have been a modern version transmitter in one of the CQ
magazines using an 802, but details are real fuzzy.

Remember to put the rig on the air - it needs exercise.

73, Colin K7FM

COLIN LAMB wrote:
The 1938 Radio Handbook (page 301) has a Reinartz Crystal Oscillator which
uses an 802 tube. It features a tuned cathode circuit at 1/2 the frequency
of the crystal. In that circuit, keying is in the screen. It featured low
crystal current and high efficiency. Reinartz never minded re-inventing the
wheel to get improvements.

I think there may have been a modern version transmitter in one of the CQ
magazines using an 802, but details are real fuzzy.

Remember to put the rig on the air - it needs exercise.

73, Colin K7FM


Thanks, Colin. But thats not this one. Straight plain-jane cathode
keyed xtal osc circuit. Methinks its a modern project.

-Bill WX4A