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                      THE CGC COMMUNICATOR
                            CGC #521
                     Wednesday, July 3, 2002
                 Robert F. Gonsett, W6VR, Editor
     Copyright 2002, Communications General Corporation (CGC)
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  FCC PROPOSES ALLOCATION AND SERVICE RULES
  FOR THE 71-76, 81-86, AND 92-95 GHZ BANDS
  This Notice of Proposed Rule Making is designed to promote
commercial development and growth of the "millimeter wave"
spectrum in the 71-76, 81-86 and 92-95 GHz bands under Parts 15
and 101 of the Commission's Rules.  The millimeter wave band is
also known as the Extremely High Frequency (EHF) band, and refers
to radio signals between 30 and 300 GHz.  Here, the wavelengths
range between 1 and 10 millimeters.
  For technical information, see the MISCELLANEOUS section
of this newsletter.
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                      LOCAL & REGIONAL NEWS
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  EAS WORKING WELL IN THE ARIZONA WILD FIRE EVACUATIONS
  Navajo & Apache Counties, AZ - The EAS system is working
well for ordering evacuations in the ongoing Arizona wild fires.
About 30,000 people were evacuated at the height of this
emergency, Show Low and Pinetop-Lakeside being the two prominent
communities involved.
  Thanks to extensive efforts by Mike Woodworth, Contract
Chief to 11 broadcast stations in that area, paperwork and
hardware problems associated with EAS were largely resolved
last year.  Now, the Navajo County Sheriff's Office can order
evacuations directly, and other top county officials can
originate EAS messages as well.  For further information, Mike
can be reached at 928-537-2345 or <woodworth_mike@hotmail.com>.
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  SAN DIEGO EAS TEST JULY 3 - REMINDER
  July's Required Monthly Test (RMT) will be issued by the
LP-1 (KOGO-AM) between the times of 2:45 p.m. and 2:50 p.m. on
Wednesday, July 3rd.  The LP-2s (KSDO-AM, and KPOP-AM) will relay
the RMT upon receiving it.
  The revised EAS rules are now in effect.  The time limit
requirement for rebroadcast of Required Monthly Tests (RMTs) has
been expanded to one hour.  Participating facilities now have
greater flexibility in relaying the RMT.
  Television stations have the additional requirement to visually
display the message in a text crawl that appears along the upper
part of the screen at the same time as the aural message is
broadcast.
  Oscar Medina, Chairman, San Diego LECC EAS
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  THE RED BLANCHARD WEBSITE
  Many of you remember Red Blanchard of KPRO/KCBS/KFWB fame.
Red happens to live in our area and has a sharp looking web site
(copyright 1911) with terrific photos from the past.  Take a most
nostalgic tour:
  http://www.redblanchard.com/
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  A LOOK AT RADIO PROGRAMMER DRAKE-CHENAULT
  For a fascinating look back at Drake-Chenault Enterprises,
including pictures and descriptions of their inside technical
operations on Topanga Canyon Blvd. in Canoga Park, see:
  http://www.drakechenault.org/
  Hank Landsberg was their Director of Engineering from 1974
to 1988, and has provided a wealth of material for this web
posting.
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                     LETTERS TO THE EDITOR
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  TREES AS ABSORBERS OF RF
  At a cable receive site in the Santa Cruz mountains, the
antennas were pointing through a cluster of pines on adjacent
property.  VHF reception was okay, but there was no UHF.  The
company used a site DOWN the hill that was free of trees for UHF.
  At 2.5 gigs, heavy foliage in the residential section of
Hillsborough made it just about impossible to receive ITFS.
  Terrain clutter has become a hot item as none of the prediction
methods for signal contours have much meaning unless it can be
factored in.  Topo programs won't tell you about trees.
  Roy Trumbull
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  INTENTIONALLY BLOCKING RF
  Some restaurants and theaters have installed cellular/PCS
jamming transmitters to keep wireless phones from ringing.
Of course, these jammers are illegal in the U.S., but there are
other ways of blocking cellular/PCS signals such as making the
room in question into a Faraday cage by blocking the electric
field component of the incoming signal.
  Now, CGC readers Oscar Medina and Mark Van der Hoek have
pointed to a new product which claims to attack the magnetic
field instead.  So-called "magnetic wood" may be seen at:
  http://www.newscientist.com/news/news.jsp?id=ns99992461
  Even if "magnetic wood" works by the mechanism claimed (the
jury is still out), we suspect that more filtering will be
needed to effectively shield a room - much more than the mere
installation of "magnetic wood."
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  DO UNUSED CARBON RESISTORS CHANGE VALUE WITH AGE?
  In my half century of experience with electronics, carbon
resistors in particular, I'm unable to detect any perceptible
change of value in my resistors, some with more than 40 years
on the shelf.  However, I have consistently found that resistors
used in DC applications tend to lower in value over time; those
used in AC applications tend to raise in value, sometimes to the
extent they even open.
  David Zulli, CPBE
  ______
  I have noticed resistors out of the 40s & 50s increase in
value.  It's a real pain if you are restoring an old piece of
equipment to original condition.
  Paul, WA6EUZ
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                          MISCELLANEOUS
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  TOWER/BIRD KILL STUDY ENCOURAGED
  Members of Congress are being encouraged to fund a study
by the U.S. Fish and Wildlife Service into whether there is a
relationship between bird deaths and communications towers.
  http://www.rwonline.com/dailynews/one.php?id=1681
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  FCC PROPOSES ALLOCATION AND SERVICE RULES
  FOR THE 71-76, 81-86, AND 92-95 GHZ BANDS - CONTINUED
  Research sponsored by the U.S. government has led us to
the verge of being able to use millimeter waves economically.
  One advantage of using this frequency band is that the beams
can be tightly collimated, easing channel sharing.  Another
important consideration is increased path loss due to oxygen and
atmospheric absorption which can perhaps be viewed as a positive
in terms of frequency reuse for broadcast-type applications,
such as high speed data transfer.
  For example, attenuation below 30 GHz due to atmospheric
absorption is about 0.4 dB/km for the worse case of atmospheric
conditions graphed.  With the same conditions, a 40 GHz signal
was shown to be attenuated at about 0.7 dB/km, and signals between
92-95 GHz were shown to be attenuated at the rate of about 2-3
dB/km - however, heavy rain can drive absorption to 5 dB/km in
that frequency segment.
  The place where you really want to watch out is around 60 GHz.
Here, signal loss due to absorption by oxygen molecules shows a
dramatic jump, to a peak of about 15 dB/km even in clear weather!
http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-02-180A1.doc
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           LOCAL ITEMS FROM THE FCC    (FCC TYPOS TOO)
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  FM AUXILIARY TRANSMITTING ANTENNA APPLICATION FOR LICENSE TO
  COVER AUXILIARY PERMIT ACCEPTED FOR FILING
  BXLH-20020621AAS  KGB-FM  34454 CITICASTERS LICENSES, INC. (NEW)
              E   101.5 MHZ              SAN DIEGO, CA
  License to cover an auxiliary permit
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  BXLH-20020621AET  KIOZ  13504  CITICASTERS LICENSES, INC. (NEW)
             E   105.3 MHZ       SAN DIEGO, CA
  License to cover an auxiliary permit
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  TV TRANSLATOR OR LPTV STATION APPLICATION FOR MINOR MODIFICATION
  TO A CONSTRUCTION PERMIT DISMISSED
  BMPTTL-19990903AAS  K31FC 13022  COMMUNITY SERVICE TELEVISION CO.
                 P   CHAN-31               SAN DIEGO, CA
  Modification of construction permit (BPTTL-19810318JJ,
  as modified). Dismissed per applicant's request.
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  EXPERIMENTAL GRANT OF INTEREST
  WC2XVD, CLEAR-COM INTERCOM SYSTEMS, 0200-EX-PL-2001
  New experimental to operate in 470-608 MHz, 614-740 MHz for
  FM audio communications for film and theatre industry.
  Mobile:  Within the Continental United States, Alaska & Hawaii
  http://hraunfoss.fcc.gov/edocs_public/attachmatch/DOC-223885A1.doc
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  FM AUXILIARY TRANSMITTING ANTENNA APPLICATIONS FOR LICENSE TO
  COVER AUXILIARY PERMIT GRANTED
  BXLH-20020225AAS   KSSE   58809    ENTRAVISION HOLDINGS, LLC
               E   97.5 MHZ                RIVERSIDE, CA
  License to cover auxiliary permit.
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  The CGC Communicator is published for broadcast professionals
  in so. California by Communications General Corporation (CGC),
  consulting radio engineers, Fallbrook, CA.  Short news items
  without attached files are always welcome from our readers;
  letters may be edited for brevity.  E-mail may be sent to:
  rgonsett@ieee.org  or  telephone (760) 723-2700.
  CGC Communicator articles may be reproduced in any form provided
  they are unaltered and credit is given to Communications General
  Corporation and the originating authors, when named.  Past
  issues may be viewed and searched at http://www.bext.com/_CGC/
  courtesy of Bext Corporation.
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