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                      THE CGC COMMUNICATOR
                            CGC #508
                     Friday,  April 12, 2002
                 Robert F. Gonsett, W6VR, Editor
     Copyright 2002, Communications General Corporation (CGC)
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  FCC MEDIA BUREAU RULES THAT ECHOSTAR'S "TWO-DISH" PLAN
  VIOLATES LAW AND FCC RULES
  The FCC has ruled that EchoStar's "two-dish" plan, as
implemented, violates both the Communications Act and the
Commission's rules.  The Bureau said that EchoStar must come
into compliance immediately and file a progress report within
30 days.
http://hraunfoss.fcc.gov/edocs_public/attachmatch/DOC-221354A1.doc
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    SPECIAL SECTION ON DIGITAL AUDIO BROADCASTING FOR RADIO
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  BACKGROUND
  Systems have been proposed by iBiquity Digital Corporation
to allow all AM & FM stations in the United States to add digital
sidebands to their transmissions.  The new carriers will allow
listeners equipped with new and specially designed receivers to
enjoy much better fidelity (in the case of AM) and much less
multipath fading (in the case of FM) - positive steps forward for
the broadcast industry.  However, certain engineering tradeoffs
are involved.
  The systems, as conceived many years ago, would "bury" the
digital data beneath the primary analog signals.  Specially
equipped receivers would then recover the digital data using
sophisticated signal processing techniques.  This approach was
called in-band on-channel ("IBOC") digital audio broadcasting
("DAB") and it was hoped that full compatibility would be provided
with existing analog-only receivers.   Unfortunately, IBOC was
not sufficiently robust to do the job.
  Today's approach to DAB involves in-band adjacent-channel
("IBAC") techniques where the digital data are transmitted almost
exclusively on the first adjacent channels to the analog stations.
For example, a station assigned to 1050 kHz will transmit DAB
carriers in the spectrum ordinarily assigned to 1040 and 1060 kHz
stations.  An FM station on 104.3 MHz will transmit its DAB data
in the 104.1 and 104.5 MHz channel spectrum.
  While some may argue that the DAB carriers continue to
represent an "IBOC" (on-channel) approach because the new carriers
will fit within the "emissions mask" of the primary stations, the
new digital data will in fact largely reside in the first adjacent
channels for both the AM & FM DAB systems.  The understanding
that we are now dealing with IBAC (adjacent channel) DAB systems
is crucial to understanding why - under certain circumstances -
the AM & FM DAB systems will cause interference to neighboring
stations.
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  NRSC ENDORSES DAYTIME-ONLY USE OF THE AM DAB SYSTEM
  A potentially major delay to the roll out of AM & FM
digital audio broadcasting in the United States surfaced at
this week's NAB convention in Las Vegas.  On April 6, 2002, the
National Radio Systems Committee ("NRSC"), which has been
carefully reviewing iBiquity's AM DAB test results, voted to
endorse the AM system FOR DAYTIME USE ONLY.  (NRSC approved
iBiquity's FM DAB system for full time use earlier.)
  While many had hoped that the AM & FM DAB roll outs would
occur simultaneously, the "daytime-only" provision attached to
the AM system is a significant fly in the ointment.  Nevertheless,
at least one major group broadcaster has expressed an interest in
charging ahead by asking the FCC for full-time AM DAB test
authority, to determine firsthand the extent of interference
caused at night.  (There is, of course, no assurance that the
FCC will go along with such a request - or perhaps the Commission
will restrict any such testing to after-midnight hours.)
  The NRSC will need to evaluate additional nighttime data before
issuing a final ruling on whether AM DAB should be used at night -
and this information may take months to collect and evaluate.
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  SO. CALIFORNIA IS ONE OF SIX INITIAL DAB ROLL OUT MARKETS
  Despite NRSC's daytime-only vote on the AM DAB system, a
portion of southern California has been selected as one of six
initial roll out markets for digital audio broadcasting, starting
immediately, subject to FCC approval.  The approximate area
will consist of the following counties:  Los Angeles, Santa Ana,
Riverside, San Bernardino, Ventura, Santa Barbara and the upper
half of San Diego - this, according to a colorful wall chart
posted at iBiquity's NAB booth.
  Asked why the bottom half of San Diego County was not
included in the roll out, iBiquity's Glynn Walden responded that
the receiver manufacturers defined the roll out areas, and were
apparently looking for regions where large numbers of receivers
could be sold.
  The DARS roll out for southern California will represent a
monumental change in the way radio broadcasting is conducted -
and does not come with a guarantee of success.
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  THE INTERFERENCE CONCERN
  On one side of the interference question, iBiquity Digital
Corporation is decidedly bullish and maintains that very little
interference will occur for the vast majority of AM & FM broadcast
stations - especially in their primary coverage areas.  On the
other side of the coin, the NRSC's own DAB committee has expressed
reservations about the nighttime efficacy of the AM DAB system
(as mentioned earlier), Bill Suffa of Clear Channel Communications
("CCC") has questioned whether CCC will even deploy iBiquity's
systems (citing in part interference concerns, his remarks were
made in an NAB forum), and there are excellent examples of
potential problems for the FM DAB system right here in southern
California.
  Southern California is characterized by a number of grossly
superpowered FM stations on Mt. Wilson, and a number of short
spaced stations as well.  Add to the mix summertime temperature
inversion layer ducting, and genuine interference concerns
arise.  For example, how will KATY(FM), 101.3 MHz, fare in the
Temecula valley when KRTH, 101.1 MHz (58 kW ERP @ 893 m HAAT)
begins DAB transmissions on Mt. Wilson?  This is but one of a
number of examples which come to mind - and underscores the
need for as many southern California stations as possible to
participate in the DAB roll out.
  Considering that Los Angeles, San Diego and Tijuana share
an over-water propagation path, it would be an excellent idea
to include the latter two markets in the DAB roll out in order
to fully test the iBiquity IBAC systems.
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  THE POTENTIAL OF DAB
  Don't assume that DAB is destined for failure because of
the concerns expressed above.  All things considered, IBAC DAB
holds the promise to dramatically improve the quality of radio
broadcasting for the vast majority of stations - especially
in their primary coverage areas.  We are looking forward to the
equipment roll out, and will be anxious to publish all local DAB
reports - pro and con - as they surface.
  CGC encourages as many stations as possible to participate in
the roll out - which will be the first full scale deployment of
the iBiquity IBAC system - a de facto Beta Test to find out if
DAB delivers as promised.  If there are only a few reports of
interference but many reports of improved service as iBiquity
anticipates, the AM & FM systems will be clear winners and the
radio industry will undergo a dramatic and fundamental change
for the better.
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           LETTERS TO THE EDITOR    (NINE LINE LIMIT)
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  A "TASTE OF NAB" ROAD SHOW
  Since fewer engineers attended the NAB this year, I've put
together a ROAD SHOW, called "Taste of NAB," which will bring a
small part of NAB to you.  It'll be in Los Angeles on April 29th
and San Diego May 1st.  Please see our web site for details:
  http://www.tech-notes.tv/Trip/Trip.htm
  The ROAD SHOW will be like an SBE presentation in many
respects, and I do need help in finding suitable venues (my
e-mail address follows).  Our web site will be updated once the
final locations are known:   http://www.Tech-Notes.tv/
  Feel free to extend this invitation to anyone you think might
be interested -- TV stations, cable, post houses, radio, even
amateur radio folks.
  Larry Bloomfield, KA6UTC, Larry@Tech-Notes.TV
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  RE THE IMAGINARY JOB DESCRIPTION
  I just saw the imaginary job description link in CGC #507,
and I know at least some of the history of that text.  As far
as I know, the concept started with Richard Rudman in a piece
called "Respect."  I made the job description spoof in the early
'90s and published it in (I think) the Sacramento SBE Newsletter.
  It looks like somebody has updated it with new tasks.  As
time goes on, the list will undoubtedly change to match the
present day job!
  Chip Morgan, President, CMBE, Inc.
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  NAB DELAY
  Because of the NAB convention, some Letters to the Editor
are backlogged for review.  We'll get to those soon.  Thanks for
your patience.
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           LOCAL ITEMS FROM THE FCC    (FCC TYPOS TOO)
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  CALL SIGN CHANGES GRANTED
  KJAZ(AM), Beverly Hills, to KSUR
  KFSD(AM), Escondido, to KSPA
  KEWS(AM), San Bernardino, to KTDD
  FCC Report No. 430
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  FM TRANSLATOR APPLICATION FOR MINOR MODIFICATION TO A LICENSED
  FACILITY ACCEPTED FOR FILING
  BPFT-20020328AAT    K210CL  90642   SANTA MONICA COMMUNITY
                 P   89.9 MHZ            COLLEGE DISTRICT
                                          LEMON GROVE, CA
  Minor change in licensed facilities
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  BPFT-20020329ADL  K216DW  88469   EDUCATIONAL MEDIA FOUNDATION
               P   91.1 MHZ              CATHEDRAL CITY, CA
  Minor change in licensed facilities
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  FM STATION APPLICATION FOR MINOR MODIFICATION TO A LICENSED
  FACILITY GRANTED
  BPH-20011217AAH     KGBA  66640    THE VOICE OF INTERNATONAL
               E    100.1 MHZ        CHRISTIAN EVANGELISM, INC.
                                           HOLTVILLE, CA
  Minor change in licensed facilities
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  FM TRANSLATOR APPLICATION FOR MINOR MODIFICATION TO A LICENSED
  FACILITY DISMISSED
  BPFT-20020206ABK  K209CO  86849 FAITH COMMUNICATIONS CORPORATION
               E   89.7 MHZ               PALMDALE, CA
  Minor change in licensed facilities
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  TELEVISION APPLICATION FOR LICENSE TO COVER GRANTED
  BLCT-20010712AGN    KAZA-TV  29234  PAPPAS SOUTHERN CALIFORNIA
               P      CHAN-54                LICENSE LLC
                                              AVALON, CA
  License to cover construction permit no: BPCT-19860210KM,
  callsign KAZA-TV.
  ________________
  TELEVISION APPLICATION FOR MINOR MODIFICATION TO A CONSTRUCTION
  PERMIT GRANTED
  BMPCT-20010724AAM   KAZA-TV  29234  PAPPAS SOUTHERN CALIFORNIA
                  E   CHAN-54                LICENSE LLC
                                              AVALON, CA
  Modification of construction permit file number BPCT-19860210KM,
  as modified by BMPCT-20000928AIF.
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  NOTICE OF ACCEPTANCE FOR FILING OF TELEVISION BROADCAST STATION
  APPLICATION AND NOTICE OF PETITION TO DENY DEADLINE
  No URL available yet.  May not even contain item/s in our area.
  If interested nevertheless, watch
  http://www.fcc.gov/Daily_Releases/Daily_Digest/2002/dd020410.html
  for the URL to be disclosed.  FCC Report No. 25210A.  Cut-Off
  Date of May 17, 2002.
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  FM STATION APPLICATION FOR MINOR MODIFICATION TO A LICENSED
  FACILITY GRANTED
  BPH-20010410AAA     KRCK-FM  52808  PLAYA DEL SOL BROADCASTERS
                  E   97.7 MHZ               MECCA, CA
  Minor change in licensed facilities
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  FM STATION APPLICATION FOR LICENSE TO COVER ACCEPTED FOR FILING
  BLED-20020405ABG  KSDS  58818  SAN DIEGO COMMUNITY COLLEGE DIST..
              E   88.3 MHZ                SAN DIEGO, CA
  Lic. to cover
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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.
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  they are unaltered and credit is given to Communications General
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  courtesy of Bext Corporation.
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