Does FCC calculate AM night power on class D under 250 watts?

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Thread: Does FCC calculate AM night power on class D under 250 watts?

  1. #1

    Does FCC calculate AM night power on class D under 250 watts?

    Back in the day when the FCC was allowing daytime class D AMs to operate at night nondirectional below the minimum of 250 watts( PSSA ) they calculated the night time power for you. Do they still do that or when applying to go from directional night to nondirectional night at lower than 250 watts does the applicant submit the calculation?

  2. #2
    Quote Originally Posted by Larry the radio guy View Post
    Back in the day when the FCC was allowing daytime class D AMs to operate at night nondirectional below the minimum of 250 watts( PSSA ) they calculated the night time power for you. Do they still do that or when applying to go from directional night to nondirectional night at lower than 250 watts does the applicant submit the calculation?
    The applicant (or the applicant's engineering consultant) does that calculation now.
    All kinds of good stuff over at http://www.fybush.com

  3. #3
    When WPGR-AM in Monroeville, PA was approved for ONE WATT of night power,
    who did THAT calculation?

  4. #4
    Quote Originally Posted by FreddyE1977 View Post
    When WPGR-AM in Monroeville, PA was approved for ONE WATT of night power,
    who did THAT calculation?
    Back in the 70s (then) WKXR (1540) in Exeter, NH was granted THREE watts nighttime power.....the owner AND engineer agreed this "flea-power" wouldn't get the signal to the downtown area
    on a good night with a tail-wind....so the station never acted on it, and continued sign-off at local sunset (1540 was (is?) a Bahamian clear channel -- and in the Northeast WPTR, Albany, NY was a powerhouse rocker..).

  5. #5
    We've got two of these in the Pittsburgh area.

    WPGR, night power one watt.
    WZUM, night power four watts.

    WZUM used to broadcast football games for Woodland Hills High School.
    Likely the signal did not make it to the stadium (which is not that far away).

    You do have to wonder why the station even bothers.

  6. #6
    Back in the early 1980s, the FCC calculated the power for the PSSAs. Generally, the power depended on the Non-DA or DA pattern, and the proximity of well protected stations, such as I-A, I-B, II-A, II-B, III-A, and III-B. Generally, if the DA-D protected the well protected III-A and III-B stations, they got more power, Non-DA less, and if the DA was directed toward the well protected stations, still less, such as WCLB 950 got only 11 watts to protect WWJ. WFLT 1420 got 142 watts since they already protected WHK quite well with the DA. The stations protecting I-As and I-Bs generally got powers in the 1-5 watt range. WPGR protects I-B WLAC 1510, and WZUM protects I-B CBE(F) 1550.

    Generally speaking, the older the station, the lower the NIF is, although there are exceptions. The WWJ and WHK call letters give you a clue about their NIF, without looking I'd say close to 3 mV/m.
    Last edited by Schroedingers Cat; 08-10-2018 at 02:31 PM.

  7. #7
    Quote Originally Posted by FreddyE1977 View Post
    WZUM used to broadcast football games for Woodland Hills High School.
    Likely the signal did not make it to the stadium (which is not that far away).
    Many AM stations with "flea power" nighttime signals -- or even daytime-only stations -- have an unofficial "high school football PSSA" to allow them to stay on the air at full daytime power until the game is over. I'm sure the FCC knows about this practice, but has rarely, if ever fined a station for doing so.

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