CGC #984

by CGC on January 12, 2010

                      THE CGC COMMUNICATOR
                            CGC #984
                   Tuesday,  January 12, 2010
                Robert F. Gonsett, W6VR,  Editor
    Copyright 2010, Communications General® Corporation (CGC)

  The following story from yesterday's CGC Communicator
newsletter has attracted more than the usual amount of attention.
The story reads as follows:
  Southern California observers suspect that an AM station
assigned to 1410 kHz is operating about 1,380 Hz low in frequency.
Local Spanish language station KCAL(AM), Redlands, is only about
3 Hz low in frequency, so they are not the culprit.
  Burt Weiner and Bob Gonsett have both listened to the mystery
carrier at their labs in Los Angeles and San Diego counties and
report hearing weak signals during daylight hours (no definitive
measurements have been made at night).
  There are no 1410 kHz stations listed in the FCC's database
for Arizona, Nevada or Baja California North.  Therefore, if the
mystery signal is originating in California, it is probably
coming from one of these 1410 kHz stations:
  KERI, Bakersfield
  KSMA, Lompoc
  KRML, Carmel
  KMYC, Marysville
  You can hear a strong beat tone (about 1,380 Hz) against
KCAL (or KERI) in a mobile receiver along Route 14 from about
Santa Clarita to Acton.  There is some evidence to suggest
that the frequency of the offset transmitter is drifting.
  Good luck in the hunt, and let us know your findings.
  No one has found the mystery signal so far, but some
pieces to the puzzle are coming together.
  Reader Terry says, "Just did a freq measurement of KERI,
Bakersfield @ 1:30 AM [on 1/11/10] and found them to be no
more than 3 Hz off frequency."
  Asked if a daytime measurement could be made, Terry replied:
  "Same TX.  It's a Harris Gates One 24 hrs a day.  Their RCA
  standby is out of service."
  "As the owner of KSMA, 1410 AM in Lompoc, I am curious as
to findings of the noise on channel....  I don't believe [we]
would be the mystery culprit."
  "Please keep me posted as to any developments."
  Shawn Knight, iradio (at)
  Knight Broadcasting Inc.
  Santa Maria, CA
  [CGC has suggested that Shawn run a specific test that
  would hopefully eliminate KSMA from the list of possible
  suspects.  -Ed]
  Reader Steven points out that the mystery signal could
be a spur from another AM station, an intermod mix, or even
a parasitic from some other type of radio service.
  "I've also put word out on the nationwide Frequency Measurement
Test group that I'm a part of.  Let's see what happens."
  Burt I. Weiner, biwa (at)
  The CGC Communicator is published for broadcast engineering
  professionals in so. California by Communications General®
  Corporation (CGC), consulting radio engineers, Fallbrook, CA.
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_________________________    End   _______________________________ 

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