amateur radio license
required to operate on the air!
TINY TORNADO QRP TRANSCEIVER
Cost estimate: $25
Here is a novelty 1-watt CW transceiver developed by KA8MAV that evolved from the"Pixie 2"
(available as an inexpensive kit) and by just changing
the output filter can be built for any band. Below is the schematic for a 40-meter modified Tiny Tornado, and IN RED show changes, corrections and modifications made -
mainly suggestions by WE6W found on the web for the Pixie 2.
This project entails soldering of components
and winding a small toroid inductor.
There are several ways
it can be constructed; this one, although not very "tiny," is
easily built on a common "prototyping" circuit board.
The receiver operates
when power is applied and "cuts out" with a soft click heard in the headphones when the
key is depressed. There is silence while the key is down (transmitting) and another
click when the key is released: "full QSK" operation.
Performance is good and the TX/RX switch allows transmit/receive on two close frequencies
with the same crystal. Audible CW signals are a direct conversion
"mix" of the crystal frequency with that of the signals received; signals on both "sides"
of the crystal frequency are heard. Measured peak output
power is 1-watt (0.7-watt RMS) on 40 meters using a battery holder for 8 'AA' cells as the 12vdc power supply; this battery holder has a connection compatible with a 9V battery clip so a 9v battery can be easily substituted (with decreased power output).