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ARRL Letter: Broadcasters Intruding on Exclusive Amateur Radio Frequencies




 
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Author Topic: ARRL Letter: Broadcasters Intruding on Exclusive Amateur Radio Frequencies  (Read 1417 times)
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Steve - K4HX
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« on: December 14, 2018, 12:35:03 PM »


Broadcasters Intruding on Exclusive Amateur Radio Frequencies

The International Amateur Radio Union Region 1 (IARU-R1) Monitoring System (IARUMS) reports that Radio Hargeisa in Somaliland has returned to 7,120 kHz after a break of several weeks, while Radio Eritrea has been reported on 7,140 and 7,180 kHz. Radio Sudan has been transmitting on 7,205 kHz with excessive splatter, IARUMS said. German telecommunications authorities have filed official complaints.

IARUMS has also reported digital signals attributed to the Israeli Navy on 7,107 and 7,150 kHz. In addition, a Russian military F1B signal was observed in mid-November on 7,179 kHz. A Russian over-the-horizon radar has returned to 20 meters on 14,335 - 14,348 kHz. It was monitored on November 22.

Earlier this fall, IARUMS reported digital signals from the Polish military daily on 7,001.8 kHz where Amateur Radio has a worldwide primary allocation. Telecommunications officials in Germany filed a complaint.

IARUMS has received reports of short "beeps" exactly 1 second apart, as well as frequency hopping between 10,108 and 10,115 kHz and 18,834 and 18,899 kHz. The signals are believed to emanate from a site near Chicago associated with an FCC-licensed experimental operation involved with low-latency exchange trading on HF (see "Experiments Look to Leverage Low-Latency HF to Shave Microseconds off Trade Times"). Although Amateur Radio is secondary on 30 and 17 meters, Experimental licenses may not interfere with Amateur Radio operations.

http://www.arrl.org/news/experiments-look-to-leverage-low-latency-hf-to-shave-microseconds-off-trade-times

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KL7OF
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« Reply #1 on: December 14, 2018, 03:53:01 PM »

Who has the ability to enforce the rules over BC stations in the 40 meter amateur band? 
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W1ITT
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« Reply #2 on: December 14, 2018, 05:18:41 PM »


The office of the General Secretariat of the International Communications Union (ITU) in Geneva has a big pad of nastygrams.  They might send one out if someone complains.  Be afraid.
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PA0NVD
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Nico and Chappie (Chappie is the dog...)


« Reply #3 on: December 14, 2018, 06:25:24 PM »

many of these countries don't respect human rights, why should they be interested to respect a frequency bandplan?
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WD8BIL
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« Reply #4 on: December 17, 2018, 03:49:07 PM »

Quote
Who has the ability to enforce the rules over BC stations in the 40 meter amateur band?


The ability? The U.S. Air Force for sure.
 Authority? No that's a different matter. Smiley

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KL7OF
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« Reply #5 on: December 17, 2018, 04:42:28 PM »

Quote
Who has the ability to enforce the rules over BC stations in the 40 meter amateur band?


The ability? The U.S. Air Force for sure.
 Authority? No that's a different matter. Smiley


There is a difference .....glad to see you caught it
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Opcom
Patrick J. / KD5OEI
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WWW
« Reply #6 on: December 18, 2018, 12:58:08 AM »

Didn't someone mention that hams ran the Russian Woodpecker off by using well-timed morse on its frequency in the ham band? Maybe I imagined that.
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Radio Candelstein - Flagship Station of the NRK Radio Network.
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« Reply #7 on: December 18, 2018, 06:21:06 AM »

Chasing the Woodpecker was great fun back then.   I used to operate 15 meters a lot, and the Woodpecker was an annoyance.  The technique was to peak up the signal on the beam, then send a string of dits back at them, matching the dit speed to the pecker rate.  It wasn't very critical.  After a minute or so, the Commies would move their Woodpecker up or down by 25 khz.  After about 3 iterations they'd leave for a while and bother some other part of the spectrum.  Even at 100 watts into a 4 element bream, my signals "over there" would be stronger than the returns they got from the objects they were tracking.
I suspect that the waveforms used by more modern OTH radars are more complex and more difficult to spoof.  But a bit of RF in their direction can't hurt, just so they know that "the frequency is in use, old man".
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PA0NVD
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Nico and Chappie (Chappie is the dog...)


« Reply #8 on: December 18, 2018, 10:44:07 AM »

So did I. I recorded the woodpecker at a battery tape recorder and played back the signal. The recorder wasn't very stable i suppose, so the signal may have appeared like a moving target. It almost always worked in short time and they changed frequency
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WB2EMS
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« Reply #9 on: December 31, 2018, 02:23:38 AM »

With modern SDR's and other rigs capable of doing good recording and playback, I suspect you could do a more effective job by just sending their own signal back at them. Might be effective against the more complex modulation schemes where 'ditting' at them might not. Chasing the woodpecker on 20 meters many moons ago with a keyer was a fun thing at times. You're reception report was the operator QSying out of band.  Grin
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73 de Kevin, WB2EMS
W3RSW
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Rick & "Roosevelt"


« Reply #10 on: January 02, 2019, 09:17:16 PM »

I'd like the movie rights to the effect of jamming by almost
 sync'd digital record and playback repetition.

"WWIII started by local ham.
    See the fireworks!
        If you're able."

"Blockbuster seen by none.
 A new record in film attendance.
 Reel melting for fun and games."

"Coming soon at your nearest ThermoPlex."
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RICK  *W3RSW*
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