Published: Saturday, 28 May 2011 14:47
Written by DK2OM & Ulrich Bihlmayer DJ9KR, Vice Coordinator IARU Monitoring System Region 1
The “Voice of Turkey” on 10110 kHz and 14210 kHz with two Intermodulation Products has gone. Big Signals with S9+35dB!
On 6 April Wolf Hadel, DK2OM, found a strong BC station on 10110 kHz. The transmitter was carrying a program in Turkish language. On 8 April Gerhard Schweidler, OE3GSA, from OeVSV reported another strong BC on 14210 kHz also in Turkish language to me. It was also carrying a program in Turkish language. I checked the frequencies. The jingles of the BCs told me, that the “Voice of Turkey” was broadcasting on two amateur radio frequencies. I immediately informed the German telecommunications authorities “Federal Network Agency” (Bundesnetzagentur) and, by means of Internet, the intruder watches of IARU Regions 1, 2, and 3. I realized that on both frequencies besides the very loud program in Turkish voice there was also audible a second program very faintly in the background: On 10110 kHz a program in English voice, and on 14210 kHz a program in German voice. So I was sure that both frequencies were not fundamentals or harmonics, but intermodulation products (IMs). I looked for the same program in Turkish language lower and higher than 10100 kHz and quickly found “Voice of Turkey” on 9460 kHz with S9+50dB. By means of this frequency I was able to find out the other frequencies which had led to the two IMs:
9785 kHz x 2 – 9460 kHz = 10110 kHz
11835 kHz x 2 – 9460 kHz = 14210 kHz
The “knitting pattern” of the Intermodulation:
The program in Turkish language was already in course on 9460 kHz. When 9785 kHz (English voice) was switched on, 10110 kHz was “generated”. When 11835 kHz (German language) was switched on, 14210 kHz was “generated”. When the interference had already lasted longer than one month, I sent letters by post and email to the Turkish Radio Television Corporation in Ankara and also to the Turkish amateur radio club. I never got an answer from the “Voice of Turkey”. From the President of the Turkish Amateur Radio Society, OM Aziz Sasa TA1E, I received an email by 26 May. He asked me, if the interference was still lasting on. In the evening of 26 May I checked both frequencies, and, oh wonder, 10110 kHz and 14210 kHz were without interference! Of course I do not exactly know who finally helped to QSY the Voice of Turkey off our ham bands. My sincere thanks go to Gerhard Schweidler, OE3GSA, and Alex Wagner, OE3DMA, from OeVSV-Austria bandwatch, to Wolf Hadel, DK2OM, “my” vice coordinator of DARC-MS. Also I want to thank engineer Edmund Grim of Federal Network Agency at Konstanz, Germany and his office. Thanks also to everybody who has helped in this case. Read more !!!