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                    THE CGC COMMUNICATOR
                          CGC #922
                   Monday,  July 20, 2009
                           ________
              Robert F. Gonsett, W6VR, Editor
              <cgc (at) cgc333.connectnet.com>
  Copyright 2009, Communications General® Corporation (CGC)
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  THE BURROWS & ATTWOOD STUDY
  One of the most interesting engineering articles around
is an extract from the 1949 report entitled, "Radio Wave
Propagation" by Burrows & Attwood.  Here, the radio-reflective
properties of the temperature inversion layer are explored
and explained.
  The inversion layer is the thing that traps smog in the L.A.
basin and it's particularly notorious during summer months in
southern California.  Bouncing a radio frequency signal off
the inversion layer is like skipping a stone off a pond.
  "Temperature inversion layer ducting" or simply "ducting"
is where VHF and UHF signals from one market are reflected off
the underside of the inversion layer and bounced into another
market with great strength -- sometimes with signals augmented
by 20 to 30 dB for long periods of time.
  For example, ducting is what imports San Diego and Tijuana FM
& TV signals into the Los Angeles basin during the summer months
even though the reverse path is not as dramatic (Mt. Wilson is
almost always above the height of the inversion layer and its
signals tend to shoot through the layer without a lot of
attenuation as documented by CGC signal strength recordings).
  Understanding ducting is important because the DTV transition
has packed television transmitters close together geographically.
CGC has recommended specific frequency offsets for some of its
clients in order to mitigate co-channel interference, and we look
forward to continuing this effort in the weeks ahead.  Meanwhile,
enjoy the Burrows & Attwood study:
  http://earthsignals.com/add_CGC/Burrows_Attwood.pdf
  As a closing thought, don't confuse ducting with other forms
of propagation such as Sporadic E which, on a single bounce, can
import signals in the 400-1300 mile range.  Ducting typically
operates in the 50-200 mile range based on local (so. Cal.)
observations.
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  FCC FORFEITURE WATCH - SELECTED ITEMS
  o  Playa Del Sol Broadcasters (KRCK) fined $4,000 for
  spurious emissions from its FM translator K238AK in Palm
  Desert:
  http://hraunfoss.fcc.gov/edocs_public/attachmatch/DA-09-1539A1.doc
  o  Inter Tech FM has been notified of its Apparent Liability
  for Forfeiture in the amount of $22,000 for marketing FM
  broadcast transmitters and external RF power amplifiers
  without proper authorization:
  http://hraunfoss.fcc.gov/edocs_public/attachmatch/DA-09-1513A1.doc
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                         RANDOM NOTES
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  NEWS BRIEFS
  o  HDTV picture quality is being squeezed on two fronts:
  the desire to multicast and to launch Mobile DTV:
  http://tinyurl.com/nft5d9
  o  The draft ATSC Mobile DTV standard has been elevated to
  "proposed standard" and final approval could come as early
  as September:
  http://www.tvtechnology.com/article/83718
  o  The second wave of DTV viewer complaints focuses on
  consumers who have intermittent reception -- digital dropouts
  if you will -- raising the question, "How many more over-the-air
  viewers will ultimately subscribe to cable or satellite?"
  http://tinyurl.com/n88yju
  http://tinyurl.com/m8xrea
  o  Hal Kneller parts company with iBiquity today.  Hal
  is a talented/dynamic fellow and will be a wonderful asset
  for his next employer:
  http://www.rwonline.com/article/84036
  o  A 600 foot tower at the three tower array at KIID(AM),
  Sacramento, has been downed by a fire.  The adjacent tower
  was damaged and cut down as caught on video tape (2nd URL):
  http://www.kcra.com/news/20063926/detail.html
  http://tinyurl.com/Tower2Toppled
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  REGARDING K63EN, SAN DIEGO
  When was the last time that K63EN, analog Channel 63, was
on the air in San Diego?  Any info at all would be appreciated.
Please reply to Bob Gonsett:
  cgc (at) cgc333.connectnet.com
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  TOM McDUFFIE OF HRO: SILENT KEY
  I'm very sorry to report the passing of Tom McDuffie,
KM6K, manager of the San Diego Ham Radio Outlet (HRO) store.
As many of you know, Tom suffered a stroke while driving to work
last Friday morning.  While Tom apparently managed to pull his
car safely to the roadside, unfortunately it was several hours
before emergency personnel discovered him in a coma behind the
wheel.  No doubt it will take a long time for each of us to move
on from this loss so I would like to recommend taking a moment
to remember Tom at the next event....  May he rest in peace.
  ______
  Tom had a profound impact on thousands of people's lives
in and out of Amateur Radio.  To say he will be missed is an
understatement.  His wife Susan is now adjusting to the loss
of both her son and Tom this past year.  She needs your prayers.
  [Two of several e-mails received by CGC]
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                     LETTERS TO THE EDITOR
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  KCBS-TV, ANALOG CHANNEL 2, LOS ANGELES, NOW DARK
  FYI, KCBS-TV, analog Channel 2, was turned off about 4 PM
Sunday, July 12, 2009, ending 60 plus years of television.
Six meters [ham radio 50-54 MHz] should be real quiet now.
  Mike Collis, KCBS/KCAL, Mt. Wilson, mcollis (at) cbs.com
  Editor's Note: KCBS was the longest running night light
  station in Los Angeles.  Analog stations KNBC, KTLA & KWHY
  were also night lights, but were scheduled to cease operations
  on June 26, 2009.
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  DIELECTRIC COMBINER ACTING AS A NIGHT LIGHT
  Here is a video of a Dielectric Combiner burning with RF
for 5 minutes.  This happened at the cowboy tower in Dallas.
It was shot from the security cameras that I installed.
  Greg Shapiro, RF Services Inc., 7/16/09, Greg (at) towerz.com
  http://www.youtube.com/watch?v=gxWc2dTljdY
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  THE L.A. MYSTERY SIGNAL ON RF CHANNEL 24
On 7/1/09, Dan Ramos, Huntington Beach, wrote as follows:
"For the last few days, I have been seeing a mystery signal
on digital Channels 24.1 and 24.4..... Color bars are seen...
with no interruption or station identification...."
Reply from CGC Editor on 7/1/09:
"You may be seeing KBEH, Oxnard.... They have a Construction
Permit for Mt. Harvard with a 1 MW facility on RF Channel 24...."
Reply from a TV broadcast engineer on 7/6/09:
"Yes, the mystery signal is KBEH-DT; however, their PSIP
isn't programmed properly.  Therefore, folks are seeing KBEH's
"true" RF channel of 24 displayed on two of their four program
streams instead of their "virtual" channel of 63.  They are
showing up as 24.1 and 24.4.  KVCR operates with virtual
channels 24.1 through 24.4 and this is causing tuning conflicts
and viewer confusion.
"BTW, KBEH's second program stream on 63.2 came up fairly
recently and wasn't there on June 13.  Many DTV receivers and
set top boxes won't pick it up until rescanned, but it depends
on the make and model."
Update from the same engineer on 7/12/09:
"KBEH has dropped the two program streams that were causing
the tuning conflicts with KVCR and they are now only operating
with 63.1 and 63.2."
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                          OFF TOPIC
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  FIRST MANNED MOON LANDING COMMEMORATED
  The website www.wechoosethemoon.org is replaying the entire
Apollo 11 mission to the Moon, in real time plus 40 years!  You
hear ALL of the spacecraft-to-mission control communications,
and see interesting graphics and timelines.
  Assuming they continue in real time + 40, the moon landing
will happen on Monday the 20th.  Broadcasters will probably enjoy
following the mission exactly as it happened 40 years ago.
  Wow!
  Hank Landsberg, Henry Engineering, HenryEng (at) aol.com
  [Wait for the data to load.   -Ed.]
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  MORE GRADE A OFF TOPIC MATERIAL
  o  This isn't an advertisement; it's a clever "mind reading
  computer program" (until you figure out how it's done).  Great
  fun to show friends -- it'll thoroughly impress the unwary.
  (Your "number" is 18 in the example, not 25.)
  http://www.regiftable.com/regiftingrobinpopup.html
  o  Roller skatin' / break dancin' babies, hot stuff:
  http://www.youtube.com/watch?v=gt4UNYUSPD4
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               AM RADIO - LOCAL ITEMS FROM THE FCC
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  CROSS-BORDER PROGRAM PERMIT GRANTED
  A cross-border program delivery permit has been issued to XEMO:
  http://hraunfoss.fcc.gov/edocs_public/attachmatch/DOC-292063A1.pdf
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  AM STATION APPLICATION FOR MINOR CHANGE TO A LICENSED
  FACILITY GRANTED
  BP-20090205ABT  KALI  56779  TRANSITION RADIO, LLC, TRUSTEE
           E    900 KHZ               WEST COVINA, CA
  Minor change in licensed facilities.
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              FM RADIO - LOCAL ITEMS FROM THE FCC
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  FM STATION APPLICATION FOR LICENSE TO COVER GRANTED
  BLH-20090618ADE  KDAY   10100   KDAY LICENSING, LLC
            E    93.5 MHZ          REDONDO BEACH, CA
  License to cover.
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  FM STATION APPLICATION FOR MODIFICATION OF LICENSE
  ACCEPTED FOR FILING
  BMLH-20090709ACO   KYSR  36019   AMFM BROADCASTING LICENSES, LLC
             E     98.7 MHZ               LOS ANGELES, CA
  License to modify.
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  FM STATION APPLICATION FOR MINOR CHANGE TO A LICENSED
  FACILITY DISMISSED
  BPH-20070119AHT  KOCP  70563  GOLD COAST BROADCASTING LLC
            E   101.5 MHZ              CAMARILLO, CA
  Minor change in licensed facilities.
  Dismissed by letter 7/2/2009
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  FM STATION APPLICATION FOR MINOR CHANGE TO A LICENSED
  FACILITY ACCEPTED FOR FILING
  BPH-20090710ASO    KSBL  35592   RINCON BROADCASTING LS LLC
             E     101.5 MHZ             CARPINTERIA, CA
  Minor change in licensed facilities.
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  FM BOOSTER APPLICATION FOR LICENSE TO COVER ACCEPTED FOR FILING
  BLFTB-20090630AFX  KCAQ-FM5  178198  GOLD COAST BROADCASTING LLC
               E     104.7 MHZ            LAS FLORES CANYON, CA
  License to cover.
  ____________
  FM BOOSTER APPLICATION FOR LICENSE TO COVER GRANTED
  BLFTB-20090630AFX  KCAQ-FM5  178198  GOLD COAST BROADCASTING LLC
               E     104.7 MHZ            LAS FLORES CANYON, CA
  License to cover.
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  FM STATION APPLICATION FOR MINOR CHANGE TO A LICENSED
  FACILITY ACCEPTED FOR FILING
  BPH-20090710ASH    KFYV   7744   GOLD COAST BROADCASTING LLC
             E    105.5 MHZ                 OJAI, CA
  Minor change in licensed facilities.
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                 TV - LOCAL ITEMS FROM THE FCC
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  DIGITAL TV APPLICATION FOR MINOR CHANGE TO A LICENSED
  FACILITY ACCEPTED FOR FILING
  BPCDT-20090709ACW   KFMB-TV  42122  MIDWEST TELEVISION, INC.
                E     CHAN-8               SAN DIEGO, CA
  Minor change in licensed facilities, callsign KFMB-TV.
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  DIGITAL TV APPLICATION FOR MINOR CHANGE TO A LICENSED
  FACILITY GRANTED
  BPCDT-20080620ADN KSWB-TV  58827 KSWB INC., DEBTOR-IN-POSSESSION
               E    CHAN-19                 SAN DIEGO, CA
  Minor change in licensed facilities, callsign KSWB-TV.
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  DIGITAL TRANSLATOR OR DIGITAL LPTV APPLICATION
  FOR DIGITAL FLASH CUT GRANTED
  BDFCDTT-20060216AGZ  K40ID-D  68071 TRINITY BROADCASTING NETWORK
                 E     CHAN-40              PALM SPRINGS, CA
  Minor change of callsign K40ID.
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  DIGITAL TRANSLATOR OR DIGITAL LPTV APPLICATION FOR DISPLACEMENT
  DISMISSED
  BDISDTL-20090202AGY   KLAU-LP   21511   GERALD BENAVIDES
                  E     CHAN-45             REDLANDS, CA
  Minor change of callsign KLAU-LP.
  ____________
  DIGITAL TRANSLATOR OR DIGITAL LPTV APPLICATION FOR DISPLACEMENT
  ACCEPTED FOR FILING
  BDISDTL-20090709AAW   KLAU-LP   21511    GERALD BENAVIDES
                  E     CHAN-45              REDLANDS, CA
  Minor change of callsign KLAU-LP.
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  DIGITAL TRANSLATOR OR DIGITAL LPTV APPLICATION
  FOR DIGITAL FLASH CUT GRANTED
  BDFCDTL-20080801AYR   KLAU-LD   21511   GERALD BENAVIDES
                   E    CHAN-66             REDLANDS, CA
  Engineering Amendment filed 09/19/2008
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  Corporation (CGC), consulting radio engineers, Fallbrook, CA.
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