There are a lot of interesting phenomena at ionosphere propagation of
example, remember LDE!). One of such phenomenon is nonlinear propagation of radio- wave in ionosphere.
What is it this effect? A very exactly description of the phenomenon
was given by Vladislav, RX3ALL, at a message sent by him in the
RU- QRP- C forum on December 19, 2005.
(Below the message is given with some cuttings)
--It was an interesting
propagation yesterday night on 20 meters. I turned on my transceiver
approximately at 19-30 UTC (22-30 local time). Nobody was at the
band. Suddenly I heard a very loud station, it was an
Ukrainian ham station/MM, it keyed on CQ.
I give my call/QRP
with 5-watts running by my IC-718. Only “QRZ?” I have received.
After several unsuccessful attempts to do QSO I increase my power
to 10 watts. The Ukrainian station, operator Gene, gave me 599…
A vessel, whence
the Ukrainian station has been worked, was at the Atlantic
Ocean. Distance between our stations was approximately
7500 kms. I sent CQ near (on frequency) the Ukrainian station,
and, in several minutes one station from Argentina called me,
after the QSO, another station from Argentina called me! (All
calls are in my log.)
BUT! The stations did not hear me on 5 watts, however when I run 10 watts,
I have received 579 and 589.
Station UA3ZNW at middle 1980s.
CW Transceiver and PA for 160,
80, 40, 20
PSU 0-16 VDC, 0- 24 VDC, 250- 500 VDC, 6.3 VAC, 12.6 VAC
Receiver for 10 meters
Automatic key, transmitter
for 10 meters, receiver for 160, 80, 40 and 20 meters.
AM transmitter for 160 meters.
are home brew