On Sat, 19 Apr 2008 15:38:31 GMT, Harold E. Johnson wrote:

"Richard" wrote in message
...
I want to homebrew a crystal controlled (or VXO) CW Tx, (capable of
break-in
operation) that employs a 2E26 tube in the PA. With ICAS operation I can
get
27 watts of RF out with a driving power of 0.17 wattts (according to my
RCA
sheet). I want most of my "design" efforts and interest to centre around
the PA stage. I think I could cope with that at least.

Can anyone please point me to a suitable solid-state exciter circuit? I
want
the Tx to cover any HF band (I'll use plug-in coils). TIA.

Why solid state? Since you're using the 2E26, you already need a high
Voltage supply, and a single stage crystal oscillator can operate from the
same supply without the need for a low Voltage supply for a multistage solid
state exciter. (It's gonna take more than one to get where you want to be.)
A tube crystal oscillator can be found in most old ARRL handbooks, using a
5763 or similar tube. Or, even a 2 stage oscillator buffer/multiplier
utilizing a triode/pentode 6EA8 or similar.

IIRC, most any 'simple' 6146 transmitter can be adapted to the 2E26 --
with minor changes in high voltage and grid bias.

The ARRL Handbooks from circa 1955-1975 seemed to always have
a "75 Watt Novice Transmitter" project.

GL ES 73
Jonesy
--
Marvin L Jones | jonz | W3DHJ | linux
38.24N 104.55W | @ config.com | Jonesy | OS/2
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