Понятно. Может у австралийца какие нибудь мега беверереджи по пустыне на все стороны света )
На странице VK2AN на qrz.com
https://www.qrz.com/db/VK2ANчитаем:
LF ANTENNAS
- 160M Doublet used as a Marconi antenna with topload and variometer for use on LF and MF
- Low Noise amplified vertical antenna (on a 9M squid pole) for 137 and 476Khz
- 10M/Side triangular hanging loop antenna for 137 and 476Khz
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Other Projects
Experiments on the 137Khz Band
- I have built a class D transmitter for the 137Khz band. It uses 4 by 32N20 FET's in a push pull configuration and will output up to around 500W carrier from a 40V, 15A supply. The supply voltage is varied to reduce output power - I generally run at around 250W. An Arduino drives a flip flop and FET driver chip, and the Arduino can be used to do QRSS and automated Morse transmisions (as my Morse skills are pretty rudimentary!).
- The amp can be driven by a separate WSPR exciter. This is also driven by an Arduino, and has a GPS chip and a Synthesizer to provide time synch and accurate frequency control.
- The transmitting antenna is a 160M half wave doublet - the 25M of twin feeder acts as the Marconi antenna and the two 40M sides of the doublet act as top load. It is tuned to resonance with a 2.2mH variometer and an antenna current meter.
- I have had good signal reports from VK5, VK4 and VK3 and I have had several reports from the US. Ground wave to VK1 works well any time of the day.
- Receive on 137Khz is done with an IC-R8600 receiver using WSJT-X software connected to a low noise vertical (LNV) antenna. The LNV has received transmissions from stations in Germany, Russia and the US and works very well.
The LNV is self powered and has 9M of wire on a 9M fibreglass squidpole. Signals are amplified by a FET preamp and sigs are relayed to the shack via a 1:1 isolation transformer and double shielded coax cable buried in the lawn. It will receive well from about 2Mhz down to below 10Khz.
Ну и немало фоток не только по 136, советую посмотреть, есть на что...
