Hello people, I agree with the nice look and smell of "glass" AM. Few years
ago, I made my CW/AM transmitter, with an 807 plate/screen modulated, 50 watts
CW, 40 watts AM output. Started with a triode/pentode oscillator/doubler VFO,
then converted to solid state oscillator/buffer, followed by a tube driver
(6BQ5) and finally the 807 to a pi tank output.
Making my own plate modulated transmitter (200..300 watts out) is a buzzing
idea in my mind since a couple of months. But here the most difficult item to
get is the modulation transformer, does someone know a method to build it by
myself?.
Many thanks in advance
Best regards
Guillermo - LU8EYW.
Brett gazdzinski escribió:
Steve,
What do you need, everything?
Here's a partial list of what you need:
3 Chassis 17x3x14,
3 panels 19x10.25?,
3 sets of side supports,
Power transformer to give 1500 volts at 500 plus ma,
Choke at 500 plus ma, two is better, swinging for the modulator,
Rectifiers (I like the k2aw? bricks),
Modulation transformer,
Bleeder resistors,
Big relay and time delay relay for step start if you go that route,
4 Tube sockets,
Filament transformers,
Killowatt plug in tank coils and its socket and swinging link,
Push pull grid coils for the bands wanted,
Push pull grid tuning cap (150 to 200 pf per section, low voltage)
Modulator grid drive transformer 8 to 10,000 ohms roughly at 20 or more
watts,
2 Neutralizing caps,
4 811a tubes,
Grid leak resistor (big wire wound pot works well),
Insulated shaft couplings,
Plate tuning cap, dual 100 pf 5000 volts or better,
Meters for grid current, mod current, plate voltage, plate current,
A large pile of wire, high voltage wire, screws, nuts, knobs, connector
strips, line cord, switches, lights, panel bushings,fuse and holder or
breaker,
spacers, ceramic standoffs, rf connectors, etc.
I could give you some stuff, and sell you some stuff most likely, and
MIGHT be able to get you a mod transformer.
Brett
N2DTS
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Wednesday, September 29, 2004 9:52 AM
To: [email protected]
Subject: [AMRadio] Home brew AM
Thanks for the replies.
The 812/811 combo was sorta what I had in mind.
Getting the components shouldn't be too hard if I keep searching.
Let me start here...anyone have any suitable parts?
About the E class...read a few things about it...sounds most
interesting...but MOSFETS don't have the fragrance of warm vacuum tubes on a
chilly winters evening nor the soft orange glow cast through the rig
perforations onto the shack walls to keep one company...nor the humming
vibrations of pumped RF being piped to the outside antenna.
73
Steve WA2TAK ______________________________________________________________
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