[Scan-DC] Third Order Intermod

[Larry Van Horn-N5FPW]

168.300 MHz will not be in any FCC database since it is a US Government 
frequency and falls under the auspices of the NTIA.

In NYC 168.300 should be a fixed voting repeater assignment and I'm pretty 
sure it is assigned to the FBI if my memory is correct.

Chief Larry

Larry Van Horn, N5FPW
President, Teak Publishing
Author North American Enroute Aviation Guide e-Book
PlanePlotter Sharer zL/Mode-S SBS Monitor
Milcom Monitoring Post http://mt-milcom.blogspot.com/
Twitter: @MilcomMP

-----Original Message----- 
From: Jeff Krauss
Sent: Monday, December 09, 2013 5:35 PM
To: David Cohen ; Scan-DC
Subject: [Scan-DC] Third Order Intermod

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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