Pole/Zero - Cosite Filtering Application Notes

NEWS & ANNOUNCEMENTS

4/9/2010 Pole/Zero presents:

RF Cosite Communications Interference Simulation and Resolution Webinar

If you were unable to attend, click here or click the title above to view.

9/15/2009 Pole/Zero presents:

Cosite Interference Mechanisms Webinar

If you were unable to attend, click here or click the title above to view.

7/27/2009 Pole/Zero Provides Comprehensive Cosite Analysis

Pole/Zero can provide a comprehensive evaluation of your platform’s cosite communication vulnerabilities, ensuring full range communications performance in the most crowded electromagnetic environments.

5/4/2009 Introducing the Pole/Zero Mega-Pole™

Achieving cosite interference protection in environments of multiple VHF/UHF tactical transceivers is now a reality through Pole/Zero’s introduction of the Mega-Pole high power (50 Watt) electronically tunable filter product line.

4/1/2009 Pole/Zero Celebrates 20 Years!

In 2009, Pole/Zero celebrates 20 years of designing and manufacturing solutions to your Cosite Interference issues. Let us put our experience to work for you.

4/1/2009 Introducing the Pole/Zero Extended Range Filter™

Continuous Coverage combined with Small Size and Low Power.

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WHITE PAPERS

Mitigating Self-Generated Communications Interference

Inadequate isolation between a transmitter and a receiver in a cosite environment results in the receiver’s diminished ability to process a weak desired signal- a condition termed “desensitization”.

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Application Notes / Noise Clean-up & Cosite Filtering

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Synthesizer, Transmitter Cleanup

An excellent application for MINI-POLE® and MAXI-POLE® filters is cleaning up noise and spurious outputs from transmitters, exciters or synthesizers at up to a 1 Watt power level. Simply placing a filter in line with the RF output and supplying it with a digital frequency word can significantly reduce spurious and noise outputs. The fast (10µs) tuning capability of the filters allows them to track even fast frequency hopping sources. Shown below is a typical spurious/noise cleanup application. A low power (1 Watt) exciter/transmitter is used to generate a clean (S/N > 200 dBc/Hz), high power transmitter output. With a single filter, noise and spurious outputs can be reduced by 60 dB.

Cosite Filtering

Simply bypassing the power amplifier in receive mode allows the same filter to serve as a receiver preselector, isolating the receiver from strong interfering signals incident on the antenna. With a third order intercept point of +40 dBm, the filter protects the receiver front end from overload (desensitization), crossmodulation, intermodulation products, etc.

Combining the receiver preselection and transmitter cleanup applications together results in an easy and cost effective method of increasing the cosite interference tolerance of existing transceivers, especially the frequency hopping variety, while at the same time