The SNV-12 Signal and Noise Voter uses Digital Signal Processors to continuously monitor multiple remote receiver sites and select the receiver with the best signal quality. A typical application is an LMR system in which mobiles and portables can hear a repeater, but due to their lower transmit power, the repeater can’t hear them.
The SNV-12’s Site Voter Modules (SVMs) use a spectral approach to continuously monitor the audio signals from each receiver site, using proprietary speech detection and measurement algorithms. These algorithms continuously calculate a 31 discrete step Signal Quality Number for each voting receiver. The SNV-12 monitors all SVMs and votes the site with the best Signal Quality Number. This thorough voting process ensures the best site is voted even if the received signal is transmitted by a vehicle currently moving behind buildings or between remote voting receiver sites.
The PTG-10 pilot tone generator is available for use with receivers that lack idle tone capability.
Application Note: Using the SVM-3/QMT-1 IP Backhaul Solution for the SNV-12 Voter
Application Note: Use of Voter Comparators to Improve Railroad Radio Communications