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NYC NOAA WX Radio DOA with Marine CH16

J

JohnnyElectron

Since there are 7 NOAA Weather Radio transmitter frequencies, why doesn't the NWS just change frequencies if all of the sudden they are mixing into Coast Guard Marine VHF CH16?
In The City, it's got to be a needle in a haystack to find this offending tower/transmitter -5.7MHz frequency combination that's dropping the weather broadcasts right smack onto VHF 16.

Per WSJ Story: "...From its perch atop the MetLife Building in midtown Manhattan, an antenna for the National Oceanic and Atmospheric Administration helps alert the New York area to severe weather, natural disasters or even a terrorist attack—when everything is working correctly, that is.

Since July, NOAA's weather alerts have been bleeding into the search and rescue channel monitored by the Coast Guard, rendering distress calls from vessels difficult or even impossible to understand..."

Anybody have any ideas for this one, other than the obvious change of frequency?
 
Was the interference continuous or intermittent? If it was continuous, the mixing product would have to be with one or more TV or FM broadcast transmitters. A harmonic of the NOAA transmitter could cause trouble with mixing. If the interference was intermittent, look for any two-way radio base stations, repeaters, or paging transmitters within a couple of blocks of the NOAA site. A spectrum analyzer would be helpful in showing which transmitter is being keyed up while the interference occurs on 156.8 (marine channel 16).

Circulators on the output of the NOAA transmitter and whichever other transmitter(s) are causing the mixing product should end the problem.
 
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