PAR Electronics, Inc.
P.O Box 645
Glenville, NC 28736
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The VHF-DN153 MAR is a 2 pole asymmetrical notch filter aimed at reducing or eliminating intermodulation products from the near by pager spectrum. Pager interference has been a major impediment to VHF marine communications. This is a result of the pager transmitter frequency assignments, high ERP and high duty cycle.
The VHF-DN153 MAR places approximately a -45dB notch in the 152-153 MHz pager spectrum while having an insertion loss in the marine band of approximately -0.5dB
A similar filter, VHF-DN158 MAR is available for targeting the pagers in the 158 pager spectrum.