Brian Beezley, K6STI designed a 9-element Yagi for the 88-108 MHz VHF-FM band with a horizontal folded dipole and three reflectors. His antenna optimizer managed to achieve 7-8 dBd gain and F/R up to 30dB over entire bandwidth. The distance between first and last element is 100″ or 254 cm. I built two of them in 2013 for receiving vertically polarized signals.

2x9el-small

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Nareszcie po ponad 7 miesiącach przerwy pojawił się troposferyczny dukt z prawdziwego zdarzenia, nie licząc słabych sygnałów z dalszej Danii w lutym. Jeżeli chodzi o odległości to tym razem jednak bez zbyt imponujących wyników, ale siła propagacji – wysoka. Mocno podwyższone warunki zauważyłem po włączeniu radia wieczorem około 22. Zresztą to nie była jedyna atrakcja tego dnia, ponieważ wcześniej nad Czechami i Słowacją rozszalała się jonosfera i MUF osiągnął grubo ponad 144MHz. Odebrałem dzięki temu wiele bałkańskich stacji, w tym także premierowy sygnał z Bośni!

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Yesterday I noticed a very weak station on 91.2 and after a while I realised it is a Swedish voice. However the antenna direction was wrong, it was heading Lithuania, Latvia and Estonia. Well… everything was clear – finally first reception via auroral propagation for me! The best signal strength was around 16 UTC with an antenna aimed at 0-30° azimuth.
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I have recently bought a portable radio receiver called Dual DAB 4. It supports DAB (MP2), DAB+ (AAC) and the analog FM. It is equipped with a monophonic speaker and a telescopic antenna (although it is too short for the FM reception). Frontier Silicon Verona FS2052 tuner module contains Apollo 2 RF front-end IC and Kino 3 DSP. It is possible to use an included external 7.5V switching power supply or 6x AA batteries.  Read more / Czytaj dalej →

Once you listen to any Czech FM broadcast channel, you can always recognize their modulation. Why? Czech Republic is using the loudest audio processing in this part of Europe. However, each FM broadcast must comply the ITU-R BS.412-9 recommendation till the end of this year, including both public and commercial programs. What does it mean? The average deviation will be greatly decreased. Some stations are already broadcasting using new standard, some not.
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I’ve been asked by our fellow Polish DXer to comment a little on his reception of a distant Ukrainian station in OIRT band. So, this time it’s not my DX, but someone elses. Alan’s report went unnoticed on Radiopolska Forum, but there’s a chance it will contribute the history of Polish FM DXing. That’s the reason to give it some attention here… Read more / Czytaj dalej →