[Scan-DC] Third Order Intermod

[Jeff Krauss]

Third order intermod:  2x162.55-168.3=156.8

I don't think filters will help.

But I searched the FCC's frequency database for a license on 168.3 
MHz near NYC and couldn't find one.




At 05:05 PM 12/9/2013, David Cohen wrote:
>Not related to DC, but interesting nonetheless.
>
>NATIONAL WEATHER SERVICE NEW YORK NY
>1110 AM EDT FRI SEP 06 2013
>
>...NOAA WEATHER RADIO NEW YORK CITY REMAINS OUT OF SERVICE...
>
>THE NOAA WEATHER RADIO TRANSMITTER THAT SERVES THE NEW YORK CITY
>METROPOLITAN AREA HAS BEEN CAUSING RADIO FREQUENCY INTERFERENCE ON
>THE U.S. COAST GUARD CHANNEL 16 TRANSMITTER FOR INTERNATIONAL
>DISTRESS...SAFETY AND CALLING SINCE LATE JULY.
>
>THE NEW YORK CITY TRANSMITTER BROADCASTS ON A FREQUENCY OF 162.550
>MHZ AND THE U.S.COAST GUARD TRANSMITTER BROADCASTS ON A FREQUENCY OF
>156.800 MHZ. OTHER TRANSMITTERS...IN VERY CLOSE PROXIMITY TO THE NYC
>TRANSMITTER BROADCAST ON A FREQUENCY OF 168.3 MHZ.
>
>THE NATIONAL WEATHER SERVICE IS WORKING WITH SEVERAL U.S. GOVERNMENT
>AGENCIES TO ISOLATE AND RESOLVE THIS TECHNICAL PROBLEM. WE HAVE
>INSTALLED A FILTER ON THE NYC TRANSMITTER...WHICH REDUCED...BUT DID
>NOT ELIMINATE THIS PROBLEM. WE WORKED WITH ANOTHER FEDERAL AGENCY
>AND OVERSAW THE INSTALLATION OF ANOTHER FILTER...ON A TRANSMITTER
>BROADCASTING OVER 168.3 MHZ...WHICH DID NOT FURTHER REDUCE THE RADIO
>FREQUENCY INTERFERENCE.
>
>WE CONTINUE TO WORK WITH THE U.S. COAST GUARD TO RESOLVE THIS
>PROBLEM AND APOLOGIZE FOR THE INTERRUPTION OF OUR ROUTINE WEATHER
>BROADCASTS.
>
>...NOAA WEATHER RADIO WILL BE PLACED IN OPERATION TO BROADCAST SHORT
>FUSE LIFE THREATENING WEATHER WATCHES AND WARNINGS...
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