[SBE] FCC R & R 73.318: FM Blanketing Interference

[Dennis Sloatman]

Hello, Glenn:

 

Thank-you for your response.  Here are the answers to your questions:

 

How old is the tower? - 4 weeks
Is it rusted? - No, new metal and paint
Are all of the fasteners on the tower tight? - It was inspected at least
twice following completion, so I'd say yes.
Is there another user on the tower? - A county 911 service, operating in the
700 mHz area.  Intermodulation measurements were made, no products found
Are the guy wires bonded to ground via a galvanized ground rod? - Yes
Is the tower properly grounded? - Very definite, Yes
What does the spectrum look like with this transmitter on and off? - Signal
on assigned frequency with Tx on, no signal when off.  EPM made upon
inception with better than full FCC compliance noted and documented.
Are the guy wires rusted? - no, new
Is the building metal? - Transmitter building is concrete, homes are mostly
of wood construction
If so is it grounded and are all of the pieces of metal bonded together? -
Building ground (which includes all equipment inside) is silver-soldered to
premises ground.



 

Best Regards,

 

Dennis L Sloatman

Sloatman Associates

MCSE/CSRE/AMD/CBNT/CNE

 

From: sbe-bounces at sbe.org [mailto:sbe-bounces at sbe.org] On Behalf Of Glenn
Little WB4UIV
Sent: Sunday, September 20, 2009 1:47 PM
To: sbe member discussion mail list
Subject: Re: [SBE] FCC R & R 73.318: FM Blanketing Interference

 

How old is the tower?
Is it rusted?
Are all of the fasteners on the tower tight?
Is there another user on the tower?
Are the guy wires bonded to ground via a galvanized ground rod?
Is the tower properly grounded?
What does the spectrum look like with this transmitter on and off?
Are the guy wires rusted?
Is the building metal?
If so is it grounded and are all of the pieces of metal bonded together?

Just a few things to start with.

Glenn Little
WB4UIV
ARRL Technical Specialist
CE WCIV TV

At 12:44 PM 9/20/2009, you wrote:



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Hello to the collective brain:
 
I am now, for the first time in a nearly forty-year career, dealing with FM
RFI complaints from a new FM station facility (15kW ERP/ 400' HAAT).  
 
These complaints include demodulated audio in PC speakers, garage door
openers that no longer work, as well as the customary "I can no longer pick
up a station I used to hear that's 95 miles away," etc.  My experiences in
this area have all been with AM stations as the facilities over the years
I've had with FM have been operating from towers in wide-open farmland or in
the swamps of Florida (I always seemed to be the C.E. for an AM  with its
site located in densely-populated residential areas).  AM RFI in some
respects, is easier to resolve inasmuch as good grounding can resolve most
complaints.
 
I'd like to hear of the experiences/solutions from all of you on this board.
I believe sharing these would be of benefit to all of us.
 
Thank-you!
 
Best Regards,
 
Dennis L Sloatman
Sloatman Associates
MCSE/CSRE/AMD/CBNT/CNE
 
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