COLIN LAMB wrote:

"While valves will work with only 9 volts on the plate they are high
impedance devices and so you will not get any significant power."

Depends upon what you mean significant. I just need a couple of milliwatts
to go a mile. He has a little cmos oscillator going into a final transistor
and keys the final transistor. The cmos oscillator runs constantly at a few
milliwatts. I can hear that, even with the final disabled, so it is simply
the blowby of a few mw oscillator.

Build a tube transmitter with power supply and keyer into an Altoids tin
seems significant.

Colin K7FM




Depends how low you want to go. I worked VK6 from 4 land with
4x2N2222As running about 750 mw out. If I had taken my rcvr to that
same relative anemic level, or if the other guy had taken his rcvr or
xmtr to that level, its doubtful that my rig would have "worked great".

hehe, as a joke, I and another guy decided to nix an obnoxious dx
buddy's success in pileups. Among many tricks, one was the signal
generator into a random-wire antenna that would effectively kill him a
half-mile away. "Hey, do you guys hear that carrier?"

You can do wonders with QRP stuff. I don't think the term "significant"
really applies.



-Bill