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High-Q cavity notch filter for rejection of interfering signals on towers with multiple transmitters. Rejection > 60 dB at notch frequency, adjustable rejection bandwidth from 25 to 200 kHz, insertion loss < 0.4 dB, 100W continuous power.
Polo Marconi
Polo Marconi Notch Filter — Selective Interference Rejection for Co-Located Towers
Technical specifications
Technical overview
The Polo Marconi cavity notch filter is the RF component for resolving intermodulation and direct interference problems on telecommunications towers where multiple transmitters coexist in adjacent bands. When a VHF/UHF receiver on a shared tower sees the transmission signal from a neighboring system on the same tower, the interfering signal can exceed the desired signal level by 60 dB or more, saturating the receiver and preventing communication.
The cavity resonator design uses electrolytic copper resonators with silver plating on high-current surfaces, raising the Q factor above 5,000 and allowing 60 dB rejection in a bandwidth of just 25 kHz — narrow enough not to affect adjacent channels of the same system.
For shared tower operators of critical communications in Peru — PNP, Senamhi, MTC, emergency network operators — the Polo Marconi notch filter is the mandatory first step before installing a new transmitter on an existing tower.
Key features
Applications
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Local technical support
EMAR SYSTEMS provides integration, training, and after-sales support for all represented products. Contact the technical team for specifications, demos, and quotes.