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Author Topic: Want to Build Novice, tube type CW transmitter  (Read 1998 times)
W7QHH
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Posts: 62




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« on: October 02, 2007, 03:40:49 PM »

Would sure like to build a 40/80 meter one or two tube cw trandmitter to use with my Hq-170A receiver to make up a vintage station such as I had back in the 50's. I have 6AQ5, 6CL6, 6V6, 807 and 1625 tubes, 80/40 meter cw crystals, coil, caps, rfc's, chassis a sockets. Does anyone out there have a schematic and other info on something I could put together, or maybe somebody has an 80 or 40 meter ARC-5 transmitter they no longer use. Any help will be greatly appreciated. Clyde, W7QHH
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K6AER
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Posts: 3525




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« Reply #1 on: October 02, 2007, 04:00:48 PM »

Fifty's ARRL handbooks are full of circuits and projects for CW transmitters.
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K8AG
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Posts: 352




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« Reply #2 on: October 02, 2007, 05:27:42 PM »

I built my first transmitter from a book called "From CB to Ham Beginner".  It is still available from time to time on Ebay.  Very easy to build and get working.

My 2 cents.

73, JP, K8AG
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KC8VWM
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Posts: 3121




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« Reply #3 on: October 02, 2007, 05:52:37 PM »

So easy, even a caveman can do it!

http://www.qsl.net/w1fif/Schematic.html

73 de Charles - KC8VWM

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N5LRZ
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Posts: 0




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« Reply #4 on: October 03, 2007, 05:32:43 AM »

Before you transmit using your home make transmitter first check out the tech specs in the FCC Rules and Regulations in re to purity of signal etc....

Make sure that your signal will meet all FCC specs befort transmitting.

Remember that it is you who are responsible for your signal.

N5LRZ
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KE3WD
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Posts: 5689




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« Reply #5 on: October 03, 2007, 09:32:24 AM »

Study up on "key clicks" and the ways we used to filter them out at the code key input (typically) when using ANY old boat anchor CW transmitter, factory made, kit or homebrew.  

After setting up your station, put a dummy load or attenuator on the antenna input to your receiver and LISTEN to your CW transmitter carefully for those key clicks.  Key clicks can make harmonics straight on up the dial and outside of the band, too.  Easy to identify and easy to eliminate.  

Construction and use of key click filter was once one of the ham test question sets, if you can get ahold of any of the old license study guides from 50s and 60s or ARRL handbooks, the whole thing is delineated there clearly.  Sometimes one capacitor across the key is all that is needed, sometimes cap and coil, cap and resistor, things like that.  Avoid large capacitance or your dits will end up ringing like a bell, like the old Telefunken CW transmitters of WWII era fame.  "bongggg..."  


Have fun,


KE3WD
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KZ1X
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Posts: 3228




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« Reply #6 on: October 03, 2007, 02:49:34 PM »

http://www.glowbugkits.com

easy!
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NORTHCOUNTRY
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Posts: 358




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« Reply #7 on: October 04, 2007, 07:49:10 AM »

You can probably put something together with  minimum of design details.  
1) Drive the tube(provide it power and current in accordance with its datasheet)
2) drive the grid with a resonant crystal
3) then match the plate output to an antenna.  

After that its just a matter of mechanics of turning the thing on and off (keying)
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N2EY
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Posts: 3895




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« Reply #8 on: October 04, 2007, 02:03:30 PM »

Surf to here:


http://www.mines.uidaho.edu/~glowbugs/tx/index.html

scroll down, and download these articles in pdf by clicking the links:

The "Inexpensive 75 Watter" transmitter which uses a 1625 or 807 and a 12BY7
 
"65 watts at Low Cost" designed by Lew McCoy W1ICP of the ARRL's Technical Staff. We have also included a slightly different version of this article from the ARRL's Understanding Amateur Radio's "Building Transmitters" section, entitled "A Low-cost Transmitter".

Sign up for the glowbugs reflector, too.


http://www.mines.uidaho.edu/~glowbugs/

73 de Jim, N2EY

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KE3WD
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Posts: 5689




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« Reply #9 on: October 04, 2007, 05:01:32 PM »

>>After that its just a matter of mechanics of turning the thing on and off (keying) <<


An in reality, it is "just" that thing that gets most and hits hardest.  


Remember all those homebrew CW xmtrs of a bygone era that sounded like sick chickens?  


Well, I do.  


KE3WD
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