[BC] Overcrowding & noise floor on AM

[Kevin C. Kidd, CSRE]

Hi Richard,

I have been doing NRSC measurements since the requirement 
began in what '94?

I have tested several stations every year since.  In the 
past couple of years I have had to move some measurement 
locations because the noise floor has crept up and up until 
it was impossible to get a valid measurement over the noise 
floor.  One point in particular is in the vicinity of power 
and telephone lines but had a normal noise floor for 
years.  I noticed about 4 years ago that the noise floor 
was up a bit, 3 years ago more until last April it was 
almost 40db above normal and unusable.  I had to go hunting 
a new site.  The general area of the stations TX had an 
unusually high noise floor.  Wasn't being produced by the 
TX either...

Due to the elevated noise floor, a city grade
signal ain't anymore.

Later,


At 11:56 AM 3/20/2007, Johnson, Richard wrote
  Note that
there is a slime-tide that wants to put Internet 
connectivity
on the power-lines as well! Go figure!

As I recall, the FCC rules required that a station put 3.16 
mV/m
at the post office in the town they were licensed to cover. 
Such
a signal would be barely usable on a Bose auto radio 
nowadays!

Cheers,

Richard B. Johnson
Project Engineer
Analogic Corporation


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Kevin Kidd, CSRE
WD4RAT
mailto:kkidd at kkbc.com

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