Monitoring System (IARUMS)

Russian taxi-interference on 28 MHz

DJ9KR (Uli) reports:

Dear fellow Intruder Busters,

More than a year ago (24 October 2010) I asked the Headquarters of SRR, Box 88, 119311 Moscow (attention Roman R. Thomas RZ3AA, Yuri B. Malyuk RA4AR)  for assistance because of the big number of illegal taxis in Russian language in FM in the range 28000 - 29700 kHz. The letter was by Air Mail and by e-Mail. Unfortunately I received no answer so far. So I decided to contact the Russian telecom authorities directly. On 29 September 2011 I sent my complaint by fax and Registered Air Mail to the Radio Frequency Service, General Radio Frequency Centre, Federal State Unitary Enterprise, 7 Tverskaya Str., Moscow 125375. To my surprise on 31 October 2011 I received an answer by fax re. RUS / CIS taxis in the range 28000 - 29700 kHz. 

Here is the answer from Moscow: read more ...

Codar Radar on 24 MHz stopped

The Codar HF Radar on 24920 - 25080 kHz from Northern Italy has been stopped. A further example for an effective cooperation! Many thanks to DJ9KR, G4BOH and 9A5W for assistance and of course grateful words to the British PTT (OFCOM) and the German PTT (BNetzA) for excellent bearings and help. We will observe this band daily in the future, hoping that the Radar will not come back again. The system is now transmitting on 25520 kHz. Why not earlier?

Intruder Alert System - worldwide cooperation!!

ZL1GWE - John (NZART) reports:

Intruder Watch Story

Well an interesting time has been had by all in the past week.  

A Radio Amateur in Northern California, inadvertently pushed a keyboard up to his keyer, which produced a stream of dots at 25 WPM for well over a week.

An international effort from Region 3 bringing in Region 1 via the Intruderwatch and various posts to DX Clusters and Yahoo groups eventually resulted in the Radio Amateur being contacted via the ARRL in the USA.  Signal reports were received from Europe, USA, Afica and Australia and New Zealand (who heard it first and raised the alarm).The resultant HF DF hunt resulted in a solid triangulation on the USA states from Radio Amateurs from all over the world.Finally, we can only imagine a slightly embarrassed Radio Amateur within the US was contacted and the stream nicknamed "Dotty" ceased yesterday.Excellent collaboration throughout the Intruderwatch organisations across Europe, USA and New Zealand, which could only have occurred with the support of the Radio Amateurs who participated in the hunt, providing signal and reports.    For a week the 18085.5 signal was an excellent HF beacon for propagation. Another exciting tale from the NZART Monitoring Service. who says monitoring is boring?

Voice of Turkey on 10110 and 14210 kHz has gone

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 !!!