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Questions on Triode 3C24 plate modulated transmitter




 
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Author Topic: Questions on Triode 3C24 plate modulated transmitter  (Read 392 times)
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N4LTA
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« on: June 22, 2020, 12:03:12 PM »

I am planning either a single or parallel 3C24 plate modulated transmitter running between 800 and 1000 volts.

I know it will have to be neutralized and I can't find much data for a pi net output with neutralization.

Any typical circuits out there?

Thanks

Pat
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WD8BIL
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« Reply #1 on: June 22, 2020, 12:10:39 PM »

Checkout the neutralization setup on Tom's 813 pi-network output rig. The pickup plate is top left of the left side 813.

http://amwindow.org/tech/htm/813/813.htm
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N4LTA
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« Reply #2 on: June 22, 2020, 08:06:37 PM »

Thanks

It looks like it will take close to 6 watts to drive two tubes. I am thinking a crystal oscillator/VFO buffer and then a 5763 driver. Looking for a typical circuit for a driver for the two 3C24s.

Pi net or inductive coupling? I assume it will have to be tuned, but untuned would be better. This will be an 80 meter only rig.

Pat
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KC4VWU
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« Reply #3 on: June 23, 2020, 09:49:47 AM »

5763 osc/buffer, 5763 amp, 3c24 PA. If only for 80/75 tuned coupling would be better to reduce harmonic content?
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WD5JKO
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WD5JKO


« Reply #4 on: June 23, 2020, 12:26:16 PM »



Pat,

    Take a look at this transmitter built by WZ5Q:

https://forums.qrz.com/index.php?threads/the-evolution-of-a-lonely-af-67.571414/

Might consider beefing up the driver to a 2E26.

I attach Mike's schematic here.

Jim
Wd5JKO


* af67 809 mods.gif (543.87 KB, 4096x3168 - viewed 54 times.)
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