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                      THE CGC COMMUNICATOR

                            CGC #833

                   Wednesday,  March 26, 2008

                             ________

                 Robert F. Gonsett, W6VR, Editor
                      <r.gonsett@ieee.org>

    Copyright 2008, Communications General® Corporation (CGC)

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  THE POINT OF FAILURE CAUSING THE KFI TOWER TO COLLAPSE

  According to preliminary information, one need look no further 
  than the slant bar with the turnbuckle that ran between ground 
  level and the one-and-only elevated guy wire anchor station at 
  KFI's transmitter site to find the point of failure that caused 
  the latest KFI tower to topple.  The slant bar is designed to 
  take virtually all the tension of the guy wires at that location, 
  and if the slant bar fails, the tower topples.  Simple as that.

  To see the slant bar before it failed, click on <http://www.k6rix.com/>, 
  then click on the second photo.  Wait while a giant set of 
  "before the failure" photos is downloaded.
  Once downloaded, watch the center column of pictures and scroll 
  down half way through the thumbnails until you spot the elevated 
  guy station: a pole perhaps 20 feet tall with an extension ladder 
  leaning up against it.  Note the slant bar running down and to the 
  right.  The three photos in the next row show the slant bar detail 
  and the turnbuckle installed in the middle of the bar.
  The failure occurred at the low end of the turnbuckle, but the 
  turnbuckle itself wasn't necessarily at fault.

  Now return to <http://www.k6rix.com/> and click on the first 
  picture.  Wait while a giant set of "after the failure" pictures 
  is downloaded.  The first picture shows the KFI tower in the act 
  of falling over, while the next two photos show the top portion 
  of the slant bar and the turnbuckle where -- hey -- the bottom 
  slant bar is missing.  (Click on any of the thumbnails for an
  enlargement.)

  It appears that the threads in the turnbuckle and the threads 
  on the lower slant bar stripped when the third level of guy wires 
  were being tensioned.  So, the upper slant bar assembly 
  (with the turnbuckle in tow) was yanked toward the tower by the 
  guy wire tension, ripping the elevated guy station pole off its 
  foundation.
  Then all of those components were drug across the parking lot by 
  the guy wires connected to the falling tower.  Anything that got 
  in the way got swept up or knocked over.  Note the bunched-up 
  chain link fence in the photo.  That was probably the fence that 
  had surrounded the elevated guy station.

  We don't yet know what caused the lower slant bar and turnbuckle 
  to separate.  Was the steel too soft in one or both components?  
  Were the thread sizes off, like fitting an 8-32 machine screw in 
  a 10-32 nut?  Many thanks to Dino, K6RIX, for posting these 
  fascinating photos and helping us understand the mechanisms 
  in this disaster.

******************************************************************

  NEWS BRIEFS

  o  FCC allows modular Part 15 transmitters so equipment
  manufacturers need not obtain a new authorization each time
  the same transmitter is installed in a different product:
  http://hraunfoss.fcc.gov/edocs_public/attachmatch/DA-08-672A1.doc

  o  Recent FCC DTV items have been published in the Federal
  Register, thereby triggering firm dates for certain events:
  http://hraunfoss.fcc.gov/edocs_public/attachmatch/DA-08-631A1.doc

  o  FCC Auction 73 (the 700 MHz auction of TV Channels 52-69,
  or a part thereof), has raised a record 19.5 billion dollars:
  http://hraunfoss.fcc.gov/edocs_public/attachmatch/DOC-280887A1.pdf

  o  As of December 2007, the FCC had licensed almost 30,000
  AM, FM and TV stations:
  http://hraunfoss.fcc.gov/edocs_public/attachmatch/DOC-280836A1.doc

  o  The FCC has released data on high-speed connections to
  the Internet as of June 30, 2007.  "High-speed" means bit
  rates of over 200 kbps in at least one direction:
  http://hraunfoss.fcc.gov/edocs_public/attachmatch/DOC-280904A1.doc
  http://hraunfoss.fcc.gov/edocs_public/attachmatch/DOC-280906A1.pdf

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  FCC ISSUES MO&O TO CORRECT CERTAIN RULES

  The FCC has made "non-substantive" changes to a number of its rules.  
  One change affects Travelers' Information Stations where Rule 
  90.242(a)(3) is being changed to read, "Travelers'
  Information Stations will be authorized on a primary basis on 530 
  kHz and on a secondary basis to stations authorized on a primary 
  basis in the band 535-1705 kHz."

  http://hraunfoss.fcc.gov/edocs_public/attachmatch/DA-08-530A1.doc

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  FCC FORFEITURE WATCH - SELECTED LOCAL ITEMS

  o  KGTV, San Diego, is issued a Notice of Violation for
  EAS RMTs apparently not sent or received:
  http://www.fcc.gov/eb/FieldNotices/2003/DOC-280427A1.html

  o  Suspected pirate, 99.1 MHz, Thousand Oaks: Notice of
  unlicensed operation issued:
  http://www.fcc.gov/eb/FieldNotices/2003/DOC-280436A1.html

  o  KGIC-LP, Corona, is issued a Notice of Violation for
  apparent EAS shortcomings:
  http://www.fcc.gov/eb/FieldNotices/2003/DOC-280569A1.html

  o  KWKW(AM), Los Angeles, is issued Notice of Violation
  for antenna structure issues:
  http://www.fcc.gov/eb/FieldNotices/2003/DOC-280567A1.html

  o  King Taco Restaurant, Los Angeles, is issued a Citation
  for causing interference from 2 GHz wireless cameras:
  http://www.fcc.gov/eb/FieldNotices/2003/DOC-280706A1.html

  o  Pirate in Lancaster (95.9 MHz) who was fined $10,000
  has had his fine reduced to $100 (a 20 dB reduction) based
  on said pirate's inability to pay:
  http://hraunfoss.fcc.gov/edocs_public/attachmatch/DA-08-606A1.doc


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                        LETTERS TO THE EDITOR
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  DTV AUDIO LEVELS VARY WIDELY -- COMMENT

  Donald Sinex in CGC #831 noted that over-the-air DTV audio levels 
  vary widely between stations and between program segments and 
  commercials.

  To provide for normalizing audio levels between DTV stations and 
  among virtual channels within a transport stream, the "dialnorm" 
  value is provided in the ATSC A/52 (AC-3) standard.
  However, no ATSC specification nor FCC rule requires it to be 
  used.  At the network level, there is a difference of opinion 
  between CBS (no use) and ABC and NBC (pro use).

  John Willkie, jwillkie (at) etherguidesystems.com

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  COMMENT ON THE USE OF AM HD RADIO AT NIGHT

  The use of AM HD Radio at night can be understood if one simply 
  said to oneself, "What would I do if I wanted to force consumers 
  to dump analog receivers and buy only HD receivers?

  Answer: Clutter up the analog band with so much noise consumers 
  will seek HD in desperation, not realizing that HD caused the 
  problem in the first place.  Same goes for the "up to 10 dB" HD 
  power increase proposed for the FM band.

  Anon.

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  DISCOURAGING THE USE OF FM MODULATORS

  I have read with interest reports of interference on the FM 
  broadcast band caused by portable modulators used to listen to 
  MP3 players.  I use one of these devices and hope I am not 
  causing interference.  It is my opinion that the problem could be 
  resolved if the FCC mandated that all car stereos sold in the US 
  have a front panel audio input jack.

  William Miller, wrmiller (at) mpandc.com

******************************************************************

  OFF TOPIC -- GONSET COMMUNICATOR II

  Check out the Gonset Communicator and RF amplifier in this 
  Mountain Dew commercial at the URL below, too funny.

  K6DYD

  Bob Gonsett comments, "That's a great clip.  Note that the RX/TX 
  switch on the Communicator II is pointed at 6 PM ("way beyond 
  transmit") - probably appropriate for the scene.

  http://tinyurl.com/2nujnu

  ...and click on "TV ADS: LIGHTNING"


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                           RANDOM NOTES
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  HANDS-FREE CELLULAR LAW DOES NOT IMPACT TWO-WAY RADIOS

  A California law going into effect July 1, 2008 generally 
  prohibits motorists from driving a motor vehicle while using a 
  wireless telephone unless a hands-free device is employed.
  However, the law is a bit unclear as to whether two-way radio 
  users, holding a wired microphone for example, would also be 
  caught up in the ban.  Now, a DMV interpretation of the law 
  clears up this issue in this Question and Answer session:

  "Q: May I use a dedicated two-way radio while driving?

  "A: Yes. The use of dedicated two-way radios such as
  walkie-talkies or Citizen Band (CB) radios is not affected
  by the new law."

  Presumably two-way radios could not be linked to the telephone 
  network or you would in fact be using a "wireless telephone." 
  In any event, the new law applies only to drivers, not 
  passengers.

  http://www.dmv.ca.gov/cellularphonelaws/dl208_03cell_phone.pdf
  http://tinyurl.com/ec7ac

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  NOTES FROM ALL OVER

  o  The Department of Justice has okayed the proposed
  XM/Sirius merger to the amazement of many:
  http://www.radioworld.com/pages/s.0121/t.12197.html
  http://tinyurl.com/2wwl8g

  o  Great web sites with photos for those interested in
  the history of KFI, Los Angeles:.
  http://www.oldradio.com/archives/stations/LA/kfipix.htm
  http://tinyurl.com/3yhxo2

  o  On-line engineering calculator:
  http://www.calculatoredge.com/index.htm

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  OFF TOPIC

  o  Lots of high resolution "zoomable" photos; try the mouse
  wheel or the +/- keys to zoom/in and zoom/out:
  http://gigapan.org/

  o  Hacksaw left in 11kV power line while the culprit vanished:
  http://tinyurl.com/2df2mp

  o  People often talk about the Hubble Space Telescope,
  but the relatively new Spitzer Space Telescope is returning
  some impressive false-color infrared images like the following
  one.  If photographed in visible light, the stars shown in this
  image would not be visible.  Infrared penetrates the haze:
  http://tinyurl.com/ysyj9t
  http://www.spitzer.caltech.edu/spitzer/index.shtml


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               AM RADIO - LOCAL ITEMS FROM THE FCC
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  AM STATION APPLICATION FOR MINOR CHANGE TO A LICENSED FACILITY
  GRANTED

  BP-20070529ACI   KCAA 43995  BROADCASTING MANAGEMENT SERVICES...
           E     1050 KHZ               LOMA LINDA, CA

  Minor change in licensed facilities.
  Engineering Amendment filed 02/29/2008

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  AM STATION APPLICATION FOR MINOR CHANGE TO A LICENSED FACILITY
  ACCEPTED FOR FILING

  BP-20080319ABU      KXO  35969      KXO, INC.
              E    1230 KHZ         EL CENTRO, CA

  Minor change in licensed facilities.


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               FM RADIO - LOCAL ITEMS FROM THE FCC
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  CALL SIGN CHANGE RESERVED PENDING STATION SALE

  KDES-FM, Palm Springs, to KUXO

  http://hraunfoss.fcc.gov/edocs_public/attachmatch/DOC-280900A1.doc

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  FM STATION APPLICATION FOR LICENSE TO COVER ACCEPTED FOR FILING

  BLED-20080319AAA   KSPC  52922   POMONA COLLEGE RADIO STATION
             E     88.7 MHZ                CLAREMONT, CA

  License to cover.

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  FM TRANSLATOR APPLICATION FOR LICENSE TO COVER GRANTED

  BLFT-20080304ACN    K224DK  139831  EDUCATIONAL MEDIA FOUNDATION
               E     92.7 MHZ                FONTANA, CA

  License to cover.

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  FM AUXILIARY TRANSMITTING ANTENNA APPLICATION FOR MINOR
  AMENDMENT TO A CONSTRUCTION PERMIT AMENDMENT RECEIVED

  BXPH-20080227ABL    KCBS-FM  9612   CBS RADIO EAST INC.
               E     93.1 MHZ           LOS ANGELES, CA

  Engineering Amendment filed 03/14/2008
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  FM AUXILIARY TRANSMITTING ANTENNA APPLICATION FOR AUXILIARY
  PERMIT GRANTED

  BXPH-20080227ABL    KCBS-FM  9612   CBS RADIO EAST INC.
               E      93.1 MHZ          LOS ANGELES, CA

  CP for auxiliary purposes.
  Engineering Amendment filed 03/14/2008

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  FM AUXILIARY TRANSMITTING ANTENNA APPLICATION FOR MINOR
  AMENDMENT TO A CONSTRUCTION PERMIT AMENDMENT RECEIVED

  BXPH-20080227ABI    KTWV  25437     CBS RADIO EAST INC.
              E     94.7 MHZ           LOS ANGELES, CA

  Engineering Amendment filed 03/14/2008
  __________________

  FM AUXILIARY TRANSMITTING ANTENNA APPLICATION FOR AUXILIARY
  PERMIT GRANTED

  BXPH-20080227ABI    KTWV  25437    CBS RADIO EAST INC.
               E    94.7 MHZ           LOS ANGELES, CA

  CP for auxiliary purposes.
  Engineering Amendment filed 03/14/2008

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  FM TRANSLATOR APPLICATION FOR ORIGINAL CONSTRUCTION PERMIT
  PERMIT CANCELLED

  BNPFT-20030827AJB   NEW  140884    WORLD RADIO NETWORK, INC.
              E     95.9 MHZ            BORREGO SPRINGS, CA

  CP New Stn.
  Petitions to deny this application must be on file no later
  than 15 days from the date of the notice accepting this
  application for filing.
  Engineering Amendment filed 05/20/2004
  Permit Cancelled 3/18/2008 per Applicant's request -
  no letter sent.

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  FM STATION APPLICATION FOR LICENSE TO COVER GRANTED

  BLH-20080214ACR   KPRI  51503   COMPASS RADIO OF SAN DIEGO, INC.
            E     102.1 MHZ                ENCINITAS, CA

  License to cover.

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  FM TRANSLATOR APPLICATION FOR ORIGINAL CONSTRUCTION PERMIT
  DISMISSED

  BNPFT-20030827AKM    NEW   141074    WORLD RADIO NETWORK, INC.
                E   103.9 MHZ                COACHELLA, CA

  CP New Stn.
  Petitions to deny this application must be on file no later
  than 15 days from the date of the notice accepting this
  application for filing.
  Dismissed 3/18/2008 per Applicant's request-no letter sent.

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  FM STATION APPLICATION FOR MINOR AMENDMENT TO A CONSTRUCTION
  PERMIT AMENDMENT RECEIVED

  BPH-20071128ACX     KDES-FM  67354   R & R RADIO CORPORATION
               E     104.7 MHZ             PALM SPRINGS, CA

  Engineering Amendment filed 03/14/2008


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                 TV - LOCAL ITEMS FROM THE FCC
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  TV TRANSLATOR OR LPTV STATION APPLICATION FOR MINOR CHANGE
  TO A LICENSED FACILITY GRANTED

  BPTVL-20080304ABW   KVTU-LP  130176    MARK C. ALLEN
                E     CHAN-3            LOS ANGELES, CA

  Minor change in licensed facilities, callsign KVTU-LP.

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  DIGITAL TV APPLICATION FOR MINOR CHANGE TO A LICENSED FACILITY
  ACCEPTED FOR FILING

  BPCDT-20080317ABU   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
  ACCEPTED FOR FILING

  BPCDT-20080319ACL   KTTV  22208   FOX TELEVISION STATIONS, INC.
               E     CHAN-11               LOS ANGELES, CA

  Minor change in licensed facilities, callsign KTTV.
  __________________

  DIGITAL TV APPLICATION FOR MINOR CHANGE TO A LICENSED FACILITY
  GRANTED

  BPCDT-20080319ACL   KTTV  22208   FOX TELEVISION STATIONS, INC.
               E     CHAN-11               LOS ANGELES, CA

  Minor change in licensed facilities, callsign KTTV.

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  DIGITAL TV APPLICATION FOR MINOR CHANGE TO A LICENSED FACILITY
  ACCEPTED FOR FILING

  BPCDT-20080319ACJ  KCOP-TV 33742  FOX TELEVISION STATIONS, INC.
               E     CHAN-13               LOS ANGELES, CA

  Minor change in licensed facilities, callsign KCOP-TV.

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  DIGITAL TV APPLICATION FOR MINOR CHANGE TO A LICENSED FACILITY
  GRANTED

  BPCDT-20080311ADB    KSCI   35608    KSLS, INC.
                E     CHAN-18        LONG BEACH, CA

  Minor change in licensed facilities, callsign KSCI.

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  DIGITAL TV APPLICATION FOR CP EXTENSION ACCEPTED FOR FILING

  BEPCDT-20080318ALZ  KFTR-DT  60549  TELEFUTURA LOS ANGELES LLC
                E     CHAN-47               ONTARIO, CA

  Extension of time to complete construction authorized pursuant
  to a modification of a DTV permit: BPCDT-19991029AFX

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  TV TRANSLATOR OR LPTV STATION APPLICATION FOR MINOR CHANGE
  TO A LICENSED FACILITY GRANTED

  BPTTL-20080228ACJ   KILA-LP  129642 VENTURE TECHNOLOGIES GROUP..
                 E    CHAN-51             CHERRY VALLEY, CA

  Minor change in licensed facilities, callsign KILA-LP.


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  The CGC Communicator is published for broadcast engineering
  professionals in so. California by Communications General®
  Corporation (CGC), consulting radio engineers, Fallbrook, CA.

  Letters to the Editor are always welcome but must be non-
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