The AM Forum
March 28, 2024, 01:39:13 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: [1]   Go Down
  Print  
Author Topic: Questions on Triode 3C24 plate modulated transmitter  (Read 1768 times)
0 Members and 1 Guest are viewing this topic.
N4LTA
Contributing
Member
*
Offline Offline

Posts: 1075


« 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
N4LTA
Logged
WD8BIL
Contributing
Member
*
Offline Offline

Posts: 4409


« 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
Logged
N4LTA
Contributing
Member
*
Offline Offline

Posts: 1075


« 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
N4LTA
Logged
KC4VWU
Member

Offline Offline

Posts: 669


« 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?
Logged
WD5JKO
Member

Offline Offline

Posts: 1996


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 223 times.)
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone © 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.078 seconds with 19 queries.