This is the most powerful radio station of the many in my basement, which I built myself.
For the technically minded, here is the low down on the transmitter.
(For newcomers to radio, click on my RADIOS link at the top of this page).
The final amplifier is plate modulated through a Thordarson T-21M65 modulation transformer. The modulator is a pair of 810 triodes producing 500 watts of sinewave audio output (2000 volts x 0.42 amperes d.c. input, class B), enough to modulate the 812A amplifier to +169% on the positive peaks - a very loud sounding signal! It is also high fidelity. This same modulator would modulate a 1000 watt transmitter to +100%, giving power inputs of 4,000 watts on modulation peaks.
I only have plug in coils for the amplifer for
40 meters, so I only use this station on 7295 kHz at this time. If
you have a shortwave radio receiver, try tuning in to that frequency to
hear me or many other amateurs who love to talk with AM radio from their
homes or even vehicles from all around North America and even around the
world. Radio is like the internet - only no computer and no
phone line/cable line are needed! You only need an antenna to send
out the invisible radio waves and to pick them up - and that can just be
a simple piece of wire! It is also very easy to build a simple radio
that actually works and can transmit to and receive from any place around
the world when atmospheric conditions are right.
|I built a radio station so small, it can be
taken with me in a canoe to talk to people around the world from the wilderness.
There is something about building a radio yourself that gives one
pleasure in communicating with other people you've never met before using
invisible radio waves (similar to the ever-growing circle of waves in a
pond of water when a stone is thrown in). This is different from
going out and buying a cell phone for instance and having to pay money
for calling someone you know.
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