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Nonlinear Propagation of Radio- Wave

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ANTENTOP- 01- 2005, # 007

Nonlinear Propagation of Radio- Wave




Igor Grigorov, VA3ZNW



There are a lot of interesting phenomena at ionosphere propagation of radio-wave (for 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.

Left corner: CW Transceiver and PA for 160, 80, 40, 20

Right corner: PSU 0-16 VDC, 0- 24 VDC, 250- 500 VDC, 6.3 VAC, 12.6 VAC

Receiver for 10 meters

Center: Automatic key, transmitter for 10 meters, receiver for 160, 80, 40 and 20 meters.

AM transmitter for 160 meters.

All equipment are home brew

Page 74


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February 22, 2020 22:07

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