[IRCA] What is a "field intensity transmitter"?

["Charles A Taylor" <wd4inp@xxxxxxx>]

  ----- Original Message ----- 

  From: Radiofldude@xxxxxxx 

  To: irca@xxxxxxxxxxxxxxxx 

  Sent: Thursday, October 05, 2006 8:45 PM

  Subject: Re: [IRCA] 1540 New Bern, NC construction permit?


  "By the way, what the HECK is a "field intensity transmitter"? I've NEVER  

  heard that term before

  PW"

  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

  Papa Whiskey,


  It's a little transmitter for UFOs to home in on.


  No.


  It is a low-power portable transmitter that is usually tuned into a short tower (50 feet, for example)

  that provides a constant radiated signal.


  An engineer uses a field-intensity meter (a calibrated radio receiver) and goes out on a straight
  line from the transmitter and makes measurements of the FIELD INTENSITY (usually in milliVolts or
  microVolts-per-meter, but they could be in S-units) at specified intervals.

  Usually the straight lines, or "azimuths" are at stated degrees on the compass, and can be as few as

  one, or as many as 100 or more.


  Generally, the setup measures real ground conductivity along a path and gives a picture of how the

  signal will die out, or be "attenuated" as a function of terrain, buildings, vegetation, horse poop,

  etc.


  And it would likely be used when the FCC's published charts may be in doubt, as when someone

  wants to see if a short-spaced station will be authorized or some other wanted-to-unwanted signal

  ratio will be exceeded or not.


  As an area becomes populated, signal along a path through that area is attenuated more rapidly 

  than the FCC's charts indicate. That is because anything metallic absorbs or reflects radio signals.


  Ask me about KSJ835-1500 50 watts, back in about 1962 in Indianapolis. It was set up to help (then)

  Radio One-Five Hundred get a CP for (then) WNDI-1500 when it was known that there would be

  overlap with WSVL-1520 Shelbyville, Indiana. The overlap was going to be in the country, so the

  FCC OKed the CP.



  Charles A Taylor, WD4INP

     Grifton, North Carolina

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