On Mar 4, 4:09�pm, Mike Coslo wrote:
wrote:

* * * * That brings up a related issue. Lots of Hams today are restricted to
one antenna, yet they would like all band operation. I think it would be a
great idea for a manufacturer to have a transciever that included a tuner
right in the rig itself.

IF and only IF they appear on some modern-day surplus
market, look carefully at an AN/PRC-104. That is a manpack
HF radio with an extra box on the side for an automatic
tuner for the whip antenna. It's been in military service
(land forces) for about 20 years now and several companies
are trying to get in with new replacements for it...Harris for
one (if I remember the military news).

Neat little thing, frequency-synthesized, SSB, can be keyed.
Designed and manufactured by Hughes Aircraft Ground
Systems. QRP of course but the military used the same
R/T for higher-power vehicular and fixed HF sets (higher
power antenna tuners, too, in those). All solid-state,
of course. I have the TM on it in PDF in case you were
really interested in that...:-)

73, Len

Mike Coslo wrote:
Solid state transmitters are notoriously finicky about matching to the
antenna. Tube equipment is not, so I am told, and early experience seems
to bear that out.

Certainly I can see one of my newer rigs start to fold back at 2:1.

What are the practical limitations of the Tube finals apparent
flexibility?

Is it safe to compare the load, plate, and drive controls to some of the
functions of a tuner? (possible real dumb question)

- 73 de Mike KB3EIA -


Most quality built amps will cover 2-30mhz, they only need the proper
filters behind 'em to keep 'em clean, and of course, you exciter needs
to put out a clean sig.

Motorola has a great circuit using four 250W transistors to get you a
kilo. It can be found on the web.

There are scores of tech papers by motorola on 100W to 1K and beyond
amps, a little research on the web should discover them.

JS
--
http://assemblywizard.tekcities.com