MYSTERIOUS INTERFERENCE IN THE SAN DIEGO AM BAND

[W4CLM]

MYSTERIOUS INTERFERENCE IN THE SAN DIEGO AM BAND

   On Wednesday night, January 11, 2006, unidentified
wideband interference blanketed the AM broadcast band in San
Diego "with peaks all over the dial" according to one report.
The interference was heard from 150 kHz to over 5 MHz and
obliterated weak out-of-town AM broadcast signals.  KNX was
said to be 90% covered by static and noise.  These observations
were made along Highway 52.

   A second report (this from an experienced broadcast engineer)
noted RFI "from 540 kHz through 5 MHz [that] came on after 6 PM,
1/11, Wed evening.  In the morning the hash was gone and [the]
band was back to normal Thursday night....  The RFI could NOT be
nulled out and was as strong OUTSIDE as inside a house.  This is
using battery portables with circuit breakers on the house pulled.
Also noticed on several radios and driving in [a] car.  Pretty
widespread.  So strong a slight hash was heard under KOGO."

This massive interference to the AM broadcast band
may be related to the development of a military jamming
system called "warlock."  It is basically a portable, high power,
wideband noise source, see:
 
http://www.hillnews.com/thehill/export/TheHill/Business/031605_pentagon.html


visit Fox tango International
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Vry 73s
Carol W4CLM

[K6IC]

And,  in the San Francisco Bay Area hear on and near 40 Meters,  something which sounds like the woodpecker (might have sounded ?) .  It is 60 - 70 Khz wide  from about 6940 to 7015 khz  er  Kcs.  Runs for a few minutes at about S9 or so.  Sounds like Loran used to varying phase motorboating kinna thing.  Have not DFed it yet.

Gotta be Defense dept.  farting around.

KF6RIP

[Ian VK3KRI]

And,  in the San Francisco Bay Area hear on and near 40 Meters,  something which sounds like the woodpecker (might have sounded ?) .  It is 60 - 70 Khz wide  from about 6940 to 7015 khz  er  Kcs.  Runs for a few minutes at about S9 or so.  Sounds like Loran used to varying phase motorboating kinna thing.  Have not DFed it yet.

Gotta be Defense dept.  farting around.

KF6RIP

Sounds very similar in wideness and freq to a HF RADAR that has been QRMing us in VK I belive its been DFed to China. Ive heard it around 40 and 80 m . I think the pulse rate is faster than the 'Classic' woodpecker - I heasured a 43.2 Hz repitation rate.  There seem to be mutiple ~50khz wide signals , but the phase of the pulses never seemed to drift relative to each other.

The VK radio authority 'ACMA' is making representation to the Chinese govt according to the lastest issue if 'Amateur Radio' the local QST equivelent...
                                                  Ian VK3KRI