CGC #1132

by CGC on April 10, 2012



                     THE CGC COMMUNICATOR

                           CGC #1132

                   Tuesday,  April 10, 2012


               Robert F. Gonsett, W6VR,  Editor

   Copyright 2012, Communications General® Corporation (CGC)



 Recent CGC Communicator newsletters have concentrated on
"anti-perching" and related devices being mandated on southern
California radio communication facilities on Forest Service land.
However, this isn't just a Forest Service issue.  Anti-perching
is an environmental issue and as such it is just a question of
time before the regulations are applied to private facilities
on private property.

 Check out these photographs (URL below) to see the bird
repellant devices installed at a small government communications
site right here in southern California.  Different gadgets were
added in order to comply with Forest Service "anti-perching" and
"flight diverter" mandates.  You are welcome to copy the photos
to others in your organization or to anyone else for that matter.
The object is to increase awareness of what is happening right
in our own backyard.  Even if you have never seen a dead bird
at your tower site, it is a good bet that your facility will
eventually be affected by the anti-perching effort.

 For background information on the photos, see the first story
in the "Random Notes" section of this newsletter. (Tepusquet Peak)



 o  The FCC seeks comments on various proposals to change
 and "promote a more sustainable" LPFM service.  Comments
 due May 7; Reply Comments due May 21:

 o  One item of particular interest in the FCC's tentative
 agenda for its April 27 Open Meeting is consideration of a Report
 & Order "establishing a regulatory framework for channel sharing
 among television licensees in connection with an incentive
 auction of spectrum:"

 o  Many TV broadcasters -- particularly those in larger
 markets -- anticipate lucrative possibilities in providing
 digital streams to mobile devices and say they see little
 reason to participate in voluntary FCC auctions that seek
 500 MHz of bandwidth for the benefit of mobile carriers:

 o  The rules adopted in FCC's 'IP Closed Captioning Order'
 will take effect on April 30, 2012 except for the rules that
 require OMB approval:

 o  The FCC resolves a number of TV band issues concerning
 in part White Space devices, protection of certain TV receive
 sites, protection of wireless services on TV CH-52 and radio
 astronomy reception:

 o  The fate of LightSquared is now in the hands of the FCC,
 but the Commission may not act soon:

 o  Broadcast Company of the Americas (San Diego) has been
 denied a C-band satellite uplink authorization for technical



 o  Notice of Unlicensed Operation issued to a 1680 kHz pirate
 at 1370 Brea Blvd., Suite 205, Fullerton:

 o  Dollar Rent-A-Car dinged $12,000 for operating an unlicensed
 transmitter in San Diego (spurious emissions spilled the beans):

 o  Notice of Violation issued to Gary R. Dent, Amateur radio
 call sign AF6HP.  While operating in the 23 cm band in Riverside,
 Mr. Dent allegedly (a) caused harmful interference to FAA radio-
 location operations and (b) engaged in TV broadcasting:

 o  USA Communications in Salton City docked for failure to
 implement the proper frequency offsets on some of its cable

 o  FCC Rule 73.3526(e)(12) concerns issues/program lists
 that must make their way into broadcast station public files
 every three months.  The following stations were missing two to
 four quarters of such lists: KPTR, KDES-FM and KPSI-FM, all in
 Palm Springs; KWXY, Cathedral City:

                          RANDOM NOTES


 With respect to the lead story in this newsletter, the 10
photographs posted at the URL below are from Tepusquet Peak
in Santa Barbara County where anti-perching and flight diverter
installation efforts began in 2005 and were concluded in 2010.
The long period of time was reportedly necessary in order for
the Forest Service to make up its mind as to what constituted
acceptable flight diverter markers on tower guy wires for
this particular installation.

 With respect to just the first photograph in the 10 photo
set, note the clever method used to install anti-perching spikes
atop horizontal metal bars that were elevated over the roof so
the roofing material would not be penetrated.  That's good
forward thinking.  We understand that galvanized uni-strut
was used.

 Of course, there is the very real question as to what the
anti-perching spikes will accomplish.  What is wrong with having
birds of prey land on rooftops?  They already perch on trees
to watch for prey.  It seems like the anti-perching effort shown
in photo #1 makes about as much sense as fencing an airport in
the hope that it will prevent planes from landing.

 Turning to the subject of microwave dish radomes, many users
of solid-backed dish antennas have already installed radomes
to keep birds and other items from reducing signal strength.
However, the Forest Service requirement that all microwave dishes
now be radome covered -- even on screen and slat-type dishes --
seems out of place.  Radomes installed on these open-style dishes
would create a huge wind loading problem as we have discussed in
earlier story parts.  It appears that some serious rethinking
on Forest Service Appendix G needs to be done.  (Tepusquet Peak)



 Univision's KMEX-TV in Los Angeles is claiming victory
as the country's highest-rated local station for March.
Congratulations to KMEX and its outstanding engineering team
who helped make the success possible.



 As-yet unpublished tests have been run on Omnia's single
sideband suppressed carrier (SSBSC) system for generating analog
FM stereo.  The findings indicate that SSBSC (a) does not on
average reduce multipath in ordinary analog FM receivers and
(b) causes a substantial increase in audio distortion (although
the numbers are small and may be masked in a noisy mobile

 If and when specialized SSBSC receivers become available
to the consumer, improved stereo performance should of course
result.  However, that may be many years in the making, if it
ever occurs.  Omnia's SSBSC system was introduced to CGC
Communicator readers in CGC #1124.

 Other technical concerns have also been expressed on SSBSC.
Check the URL below -- the bottom portion of the article posted
-- for details on those other concerns.  It may be wise to wait
for the results of rigorous testing before we embrace a new
technology based on preliminary reports -- even glowing reports
-- as many of them have been.

                            JOB SHOPPE


 KPBS TV/FM/Web, San Diego's Public premier broadcasting
organization, seeks full-time Broadcast Engineer to maintain
audio/video broadcasting, datacasting & computer equipment for
KPBS.  College degree in related field or equiv + 3 yrs radio
and/or TV engineering experience; exp. w/contemporary studio
TV and/or radio broadcast facilities; knowledge of computer
comm tech, hardware diag & repair; xlnt comm/cust svc skills.

 Salary $4868-$6125/mo + xlnt benefits.  Applications and
required supplemental questions accepted until 4/24/12.  Apply
online at or call SDSU Research
Foundation at (619) 594-5703.  Specify Job # 120039.
EEO/AA/Title IX Employer.

                      THE MT. WILSON REPORT


 The Cosmic Cafe, located in the Pavilion building atop
Mt. Wilson, is open from 10AM to 5PM every Friday, Saturday
and Sunday -- not just Saturday and Sunday as was reported
earlier.  This is the official word from Dave Jurasevich,
Superintendent of the Mount Wilson Observatory, who adds,
"Perhaps some of the tower folks might want to consider
lunch at the Cosmic Cafe on Fridays."

 Sounds like a great idea.

                         HAM RADIO NOTES


 The FCC seeks comments on the importance of emergency
Amateur Radio Service communications and on impediments to
enhanced Amateur Radio Service communications (e.g. antenna
restrictions in housing developments).

                      LETTERS TO THE EDITOR


 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  This is one of the best aeronautical engineering videos
 we've seen in the past year -- "Robots that Fly and Cooperate:"

 o  New radio telescope array will help uncover secrets of the



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