[HCDX] 40 Meter Interference Source Identified
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[HCDX] 40 Meter Interference Source Identified
In a message dated 1/5/2001 8:15:37 PM Central Standard Time, W5USM writes:
"MOTHER OF ALL JAMMING STATIONS" CONTINUES TO PLAGUE 40 METERS but is
IDENTIFIED by ARRL
For some months now, regular users of the 40-meter band have been plagued
from time to time by strong, very broad, frequency-hopping signals that
somewhat resemble a slow-scan TV transmission. The signals, it turns out,
originate from jamming stations in the Middle East.
"We know exactly what this is," said ARRL Monitoring System Coordinator
Brennan Price, N4QX. "This is a very high-power Iraqi jammer of a very
high-power Iranian shortwave broadcast station."
The loud buzzing signals have been heard on the 40-meter CW and phone bands
and have even been "spotted" on packet. The jammers occupy about 10 kHz of
spectrum.
Price says the shortwave broadcast station involved is The Voice of the
People of Kurdistan, transmitted via The Voice of the Islamic Republic of
Iran facility in Teheran. "The Iranian station has a daily transmission on
7100 kHz from the same facility, and Iraq has jammed that one also," he
says.
Price explains that the Iranian station--which broadcasts anti-Saddam
Hussein propaganda, hence the jamming--jumps frequencies several times each
broadcast in order to avoid the jamming. Unfortunately for 40-meter users,
the Iraqi transmissions follow. This results in a situation where it's hard
to predict when the jammers might show up on a given frequency block or how
long they'll stay.
Price said that neither station is transmitting where it is supposed to be.
"The Iranian and Iraqi telecommunications administrations have been advised
of this," he said.
Price says that such "politically motivated" intruders typically don't
disappear until the political situation changes. "The 'woodpecker' went away
when the Cold War did," he said. "This one will probably not go away until
Saddam Hussein does."
~~~from the ARRL Letter, January 5, 2001
73 from Bill Smith, W5USM
"Shortwave Since 1950"
--- Begin Message ---
"MOTHER OF ALL JAMMING STATIONS" CONTINUES TO PLAGUE 40 METERS but is
IDENTIFIED by ARRL
For some months now, regular users of the 40-meter band have been plagued
from time to time by strong, very broad, frequency-hopping signals that
somewhat resemble a slow-scan TV transmission. The signals, it turns out,
originate from jamming stations in the Middle East.
"We know exactly what this is," said ARRL Monitoring System Coordinator
Brennan Price, N4QX. "This is a very high-power Iraqi jammer of a very
high-power Iranian shortwave broadcast station."
The loud buzzing signals have been heard on the 40-meter CW and phone bands
and have even been "spotted" on packet. The jammers occupy about 10 kHz of
spectrum.
Price says the shortwave broadcast station involved is The Voice of the
People of Kurdistan, transmitted via The Voice of the Islamic Republic of
Iran facility in Teheran. "The Iranian station has a daily transmission on
7100 kHz from the same facility, and Iraq has jammed that one also," he
says.
Price explains that the Iranian station--which broadcasts anti-Saddam
Hussein propaganda, hence the jamming--jumps frequencies several times each
broadcast in order to avoid the jamming. Unfortunately for 40-meter users,
the Iraqi transmissions follow. This results in a situation where it's hard
to predict when the jammers might show up on a given frequency block or how
long they'll stay.
Price said that neither station is transmitting where it is supposed to be.
"The Iranian and Iraqi telecommunications administrations have been advised
of this," he said.
Price says that such "politically motivated" intruders typically don't
disappear until the political situation changes. "The 'woodpecker' went away
when the Cold War did," he said. "This one will probably not go away until
Saddam Hussein does."
~~~from the ARRL Letter, January 5, 2001
73 from Bill Smith, W5USM
"Shortwave Since 1950"
--- End Message ---