форум Радиолюбительского ДВ портала > Прием на длинных волнах
QRP на любительском ДВ 136 КГц
rw3adb:
36 inits, 12 DXCC, ODX=2651km
не плохо!
поздравляю!
r2bas:
--- Цитата: rw3adb от 11 Апрель 2022, 23:56:28 ---36 inits, 12 DXCC, ODX=2651km
не плохо!
поздравляю!
--- Конец цитаты ---
Благодарю, коллега.
rw3adb:
--- Цитата: r2bas от 12 Апрель 2022, 11:33:12 ---Благодарю, коллега.
--- Конец цитаты ---
Всячески, геноссе!
rw3adb:
Про рекорды ЩРП, правда на 630м.
My 630m QRP decoded at surprising range
I put my QRPLabs Ultimate 3 on 474kHz WSPR yesterday, using my 80m EFHW inverted-L as the antenna.
The Ultimate 3 runs 200mW and I had quite a lot of spots during the day with the best being EI0CF at around 500km.
I was quite surprised by this - the only matching on the antenna is the 49:1 transformer used for 80m EFHW operation.
Inspired by this success I connected my Hermes Lite 2 which seems to be able to put out a watt or two, though the built-in
power/SWR indication may not be reliable at these frequencies. SWR showed at around 3:1. This gave me rather more spots
with the best being over 1000km to Germany (DL4RAJ) on several transmissions. Very pleasing!
An experiment without the 49:1 transfomer showed a very high SWR and no reports received.
I'm a bit puzzled how this transformer can be partly matching the simulated antenna impedance of around 20 -j1500 on 474kHz
and allowing it to radiate at all. I expect most of my power is appearing as heat in the transformer.
A quick try on 136kHz got me a spot from G0MRF at 15km using FW5.
Much better results than I expected.
73, Neil G4BRK
Сергей UB1APE:
Вдохновляет. Надо будет попробовать. Самый мощный силовой трансформатор что есть у меня на данный момент это ТПП254 он 31Вт. при наших КПД Ватт 20-25 можно взять.
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