Re: Homebrew breadboard xmtr

exray wrote:
Hi,
I've gotten far enough along with this project to where I'm ready to toss it out for public scrutiny, so have at me, guys.

I'm a receiver guy - never built a tube transmitter from scratch and this is my first go. My goals were, in no particular order, to build something with a early 30s breadboard look, xtal control, 40/20 meters primarily - 80/30 as bonus, moderate power for getting on the air barefoot while not overpowering a future amp idea...and of course using accessible parts.

This is sort of my compilation of ideas from old QST articles. Robbed ideas from this and that to make them fit. I made some major boo-boos at first but I think I finally have them sorted out. Something that dawned on me a little bit slowly is that none of those old xmtrs were set up to operate 40 meters with a 7 Mc xtal. Much of the emphasis was on double this/double that. Nowadays we have 7 and 14 Mc fundamental xtals abounding so I went the route of reinventing the wheel so to speak.

The rig is working at this stage...at least straight thru on 40. Waiting for some other bits and bobs to carry on to other bands. The note sounds good and its nothing I'm reluctant to put on the air. On the other hand its a massive amount of wood and metal for a measly 5 or 6 watts :) A little slatboard 6V6 chirper would have been much easier.

Anyway, I'm not a veteran with old xmtrs so I'm putting it out for comments, questions, critiques, etc. Flame suit is handy!

Schematic:
http://i132.photobucket.com/albums/q18/billynaty/1stXmtr/schema111108.jpg

View:
http://i132.photobucket.com/albums/q18/billynaty/1stXmtr/Dscf1436.jpg


-Bill WX4A/KP4

Nothing that pretty can possibly work.

:-)

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html
.

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  • Re: Homebrew breadboard xmtr
    ... I've gotten far enough along with this project to where I'm ready to toss it out for public scrutiny, so have at me, guys. ... My goals were, in no particular order, to build something with a early 30s breadboard look, xtal control, 40/20 meters primarily - 80/30 as bonus, moderate power for getting on the air barefoot while not overpowering a future amp idea...and of course using accessible parts. ... Something that dawned on me a little bit slowly is that none of those old xmtrs were set up to operate 40 meters with a 7 Mc xtal. ... Nowadays we have 7 and 14 Mc fundamental xtals abounding so I went the route of reinventing the wheel so to speak. ...
    (rec.radio.amateur.homebrew)
  • Homebrew breadboard xmtr
    ... I'm a receiver guy - never built a tube transmitter from scratch and this is my first go. ... My goals were, in no particular order, to build something with a early 30s breadboard look, xtal control, 40/20 meters primarily - 80/30 as bonus, moderate power for getting on the air barefoot while not overpowering a future amp idea...and of course using accessible parts. ... Something that dawned on me a little bit slowly is that none of those old xmtrs were set up to operate 40 meters with a 7 Mc xtal. ... Nowadays we have 7 and 14 Mc fundamental xtals abounding so I went the route of reinventing the wheel so to speak. ...
    (rec.radio.amateur.homebrew)
  • Re: Homebrew breadboard xmtr
    ... I've gotten far enough along with this project to where I'm ready to toss it out for public scrutiny, so have at me, guys. ... My goals were, in no particular order, to build something with a early 30s breadboard look, xtal control, 40/20 meters primarily - 80/30 as bonus, moderate power for getting on the air barefoot while not overpowering a future amp idea...and of course using accessible parts. ... Something that dawned on me a little bit slowly is that none of those old xmtrs were set up to operate 40 meters with a 7 Mc xtal. ... Nowadays we have 7 and 14 Mc fundamental xtals abounding so I went the route of reinventing the wheel so to speak. ...
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