CGC #1121

by CGC on February 19, 2012



                      THE CGC COMMUNICATOR

                            CGC #1121

                   Sunday,  February 19, 2012


                Robert F. Gonsett, W6VR,  Editor

    Copyright 2012, Communications General® Corporation (CGC)



  o  FCC adopts rules to strengthen consumer protections
  against unwanted telemarketing "robocalls" to wireline and
  wireless phones:

  o  FCC issues an Order on matters concerning CATV operators and
  the way must-carry pictures are displayed (the "viewability
  rule" and the "HD Carriage Exemption"):

  o  The Commission proposes to modernize the 800 MHz cellular
  service rules by switching from a site-based to a geographically-
  based licensing approach:

  o  Following the success of a first-of-its-kind broadband speed
  test in 2011, the FCC is expanding the nationwide test by re-
  newing the call for volunteers to participate in its 2012 study:

  o  The Commission's International Bureau invites comments
  on NTIA's letter regarding LightSquared's conditional waiver
  (not easy reading -- the next story gives the big picture):



  It appears that the FCC has broken up with LightSquared and the divorce 
is pending.  The ill-conceived LightSquared plan to use terrestrial RF 
spectrum adjacent to the GPS downlink band has come to a halt -- for the 
moment at least.  Moreover, it is unclear that the investors in LightSquared 
will have ongoing confidence in the company's management.

  Here are some easy-to-read stories from a variety of public news sources:

  o  Happy Valentine's Day: FCC breaks up with LightSquared.
  (NTIA tells the FCC the technical facts that FCC should have
  known all along.)

  o  FCC plans to bar LightSquared's proposed use of the

  o  Senator continues quest for sensitive communications
  involving LightSquared.  (It seems reasonable to believe that
  powerful political forces were working behind the scenes to
  favor LightSquared.  Who said what and when?)

  o  LightSquared vows to continue its fight despite massive
  GPS interference problems.  (LightSquared thinks that GPS
  receivers have no right to interference protection -- the
  opposite of long-standing Commission policy that the newcomer
  must resolve all reasonable interference complaints.)

  We expect to see LightSquared try everything under the sun to save its 
venture at this time including possible frequency swaps with others.  
Stay tuned.



  The application by GLR Southern California LLC has been Accepted for Filing.  
The application is to renew a cross-border program permit to deliver 
programming via electronic means to radio station XEWW-AM, Tijuana, Mexico.  
XEWW operates on 690 kHz with an authorized power of 77kW (day).



  o  Alleged San Diego pirate Joe Serrano busted for
  operating on 106.9 MHz:

  o  Alleged Oakland pirate Sheehan Gillis docked for
  operating on 104.1 MHz:

                           RANDOM NOTES


  o  The voluntary TV spectrum auction (authorized by a measure
  to extend payroll tax cuts and unemployment benefits) addresses
  most broadcaster concerns.  NAB has done a great job with its
  lobbying effort:

  o  The state of ATSC 2.0:

  o  Aereo likely to face fight over its plan to redistribute
  broadcast TV signals:



  o Tim Hardy of Nautel shows off MDCL:

  o  New radio tech sessions on tap for NAB 2012 with an
  emphasis on HD Radio:

  o  Benton Harbor LPFM cannot be sold on eBay:

  o  Copper theft silences WZRK(AM):



  o  FCC's 3G service map:

  o  On the massive anticipated growth of mobile data:



  Re: Geoff Mendenhall's comment in Radio World  that, "AMC gives the greatest 
power consumption reduction with heavily processed audio that maintains high 
average AM modulation levels.  I have seen up to 37% power savings with AMC 
vs. up to 21% with ACC using the same transmitter, audio processing and audio 

  Based on Geoff's data, we could conclude that MDCL reduces average power 
consumption by 1 to 2 dB which is significant for a 50 kW station.  But what 
if we just reduced the transmitter power by 1 to 2 dB without using MDCL -- 
would we get the same great results?  Not without negatively impacting 
listeners according to one industry expert who said as follows:

  "In the case of ACC or DCC [types of MDCL implementation], the peak envelope 
power of the transmitter is unchanged from standard AM.  The carrier is only 
reduced during periods of low modulation, so depending on the AGC time constant 
in the receiver and the statistical percentage of the time that the audio 
modulation is low, there will be some change in the noise floor, but only 
during extended times of low modulation.  The S/N is unchanged during periods 
of high modulation.

  "With AMC, the peak envelope power of the transmitter is reduced during 
modulation peaks when the noise floor is masked by the high audio modulation.  
The full carrier is restored at low modulation levels and is unchanged from 
conventional AM during periods of low modulation when the noise floor is 
most exposed.
If one listens critically to AMC on a weak, fringe area, signal and knows 
exactly what to listen for, there is a subtle and just noticeable change in 
the noise floor during modulation peaks.
There is not any change in the noise floor during lapses in audio modulation.

  "The impact on the fringe area listener from either type of MDCL algorithm 
is subtle and psycho-acoustic in nature.  You must hear this yourself to 
appreciate how well it works."

                          HAM RADIO NOTES


  World Radiocommunication Conference 2012 ("WRC-12") delegates have approved 
a secondary allocation to the Amateur Radio Service between 472-479 kHz.  
According to Amateur Radio Newsline, "Having passed its First and Second 
Readings, it is normally a formality that this change be included in the 
conference's Final Acts when the gathering concludes and the Table of 
Frequency Allocations would then be amended accordingly."  The new allocation 
has a power limit of 1 to 5 watts EIRP depending on location.

  For more, scroll 1/3 of the way down the following page to the heading entitled, 
"Key WRC-12 Highlights."  Obviously the new band has not been 
cleared for use in the U.S. or elsewhere, but the future looks promising.



  Here is the FCC Order concerning ReconRobotics' proposed use of 420-450 MHz 
for its Recon Scout which transmits real-time video surveillance data for law 
enforcement and other government agencies.

                       LETTERS TO THE EDITOR


  The most recent Tech Letters postings include the following:

  o  Ted Hartson is looking for DON LEE television history in
  order to assemble a monograph -- a narrowly focused written
  account.  The information needed goes beyond what is readily
  available on the Internet.  Ted's contact information is
  given in this new Tech Letters posting.


  Letters to the Editor of the CGC Communicator should be posted on the 
Tech Letters Website.  Here is the URL to see the most recent postings and 
to make new postings (all letters and comments are moderated and are posted 
after review):

  Please contact the moderator, Steve Blodgett, if you are having trouble 
viewing or posting: sblodgett (at)


                            OFF TOPIC


  o  View a live wax cylinder audio recording session.  This
  is how audio recordings began and the videos are terrific:

  o  Court reverses red light camera conviction setting an
  important legal precedent:



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