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Thread: FM xlator questions

  1. #1
    Join Date
    May 2008
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    Thunderstorm, KY
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    Default FM xlator questions

    Just curious...

    Does an AM transmitter actually have to be on the air in order to legally run an FM translator?

    The reason I ask...

    Local xlator W277CH 103.3 is supposed to be running parallel to WRIK 750 AM. I haven't heard WRIK on air in a loooong time. Is this legal?

    Other local AMer-xlators...

    W258AN 99.5 runs parallel to WPAD 1560. Often just a carrier or very weak audio from 1560.

    W273CH 102.5 runs parallel to WDXR 1450. Often just a carrier or very weak audio from 1450.

    Are these non-modulated / under-modulated AMers legal?

    73, Ed NN2E
    Owner / Operator - Murphy's Law Test Site & Thunderstorm Proving Grounds
    "You Might Be a Redneck If...
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    Your cable provider has no idea that you exist."
    Jeff Foxworthy

  2. #2
    Join Date
    Dec 2010
    Location
    Poughkeepsie, NY
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    Default

    As far as I know the answer is "yes". In fact I believe that is the case for any translator..... whether it relays an AM station, an FM station, or a HD sub-channel. Someone more current with FCC rules might have different info. However, the FCC has become exceedingly lax in any enforcement, such as AMer's staying on at night with daytime facilities, allowing pirates free reign of the airwaves, and so on. The FCC probably doesn't really care if the AM signal is on or not.
    Chris - Poughkeepsie, NY
    DTV DXer since April 2009
    DTV DX screenshots at: http://www.flickr.com/photos/dtvdxer/sets
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  3. #3
    Join Date
    Jul 2005
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    Pleasant View, TN EM66
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    Default

    See 74.1263(b) which says a translator may not operate during extended periods without retransmitting the signals of the primary station. With one exception: if the translator is relaying a Class D AM station, it may operate at night if the AM station has operated in the past 24 hours. WRIK is a Class D station. WDXR isn't. (it's Class C) Whether WPAD is or isn't depends on whether it's implemented its permit to reduce power to 1kw day/35 watts night.

    73.1570 defines the limits for modulation. "Generally, the modulation should not be less than 85% on peaks of frequent recurrence, but where lower modulation levels may be required to avoid objectionable loudness or to maintain the dynamic range of the program material,..."
    Doug Smith W9WI
    Pleasant View, TN EM66
    http://www.w9wi.com

  4. #4
    Join Date
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    Default

    Chris... Are we allowed to use, "FCC" and, "enforcement" in the same sentence? :-)

    Thanks for the part 73 / 74 info, Doug. I suspect, from it's signal strength, WPAD is probably running the new (1KW day / 35W night) power levels. It just disappears, into the noise, at night.

    73, Ed NN2E
    Owner / Operator - Murphy's Law Test Site & Thunderstorm Proving Grounds
    "You Might Be a Redneck If...
    Your TV is on 24/7.
    Your TV has been permanently on for over a decade.
    The only time your TV is off is during a power outage.
    Your TV gets 512 channels, but you go outside to use the bathroom.
    Your new TV is sitting on top of your old TV.
    Your TV costs more than all of your other furniture.
    Your deer-stand has a TV antenna on it.
    Your cable provider has no idea that you exist."
    Jeff Foxworthy

  5. #5
    Join Date
    May 2008
    Location
    Thunderstorm, KY
    Posts
    1,669

    Default

    Format change...

    W273CH 102.5 // WDXR 1450 Paducah, KY is now a 60s-80s Pop / Rock format.

    "One oh two five, DXR"

    It was a Talk format until a few days ago.

    The modulation on 1450 AM sounds like it's up to par, now.

    I tried to send this info to the WTFDA FM database updates e-mail address but it bounced back. :-(

    73, Ed NN2E
    Owner / Operator - Murphy's Law Test Site & Thunderstorm Proving Grounds
    "You Might Be a Redneck If...
    Your TV is on 24/7.
    Your TV has been permanently on for over a decade.
    The only time your TV is off is during a power outage.
    Your TV gets 512 channels, but you go outside to use the bathroom.
    Your new TV is sitting on top of your old TV.
    Your TV costs more than all of your other furniture.
    Your deer-stand has a TV antenna on it.
    Your cable provider has no idea that you exist."
    Jeff Foxworthy

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