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Background:
Two-way radio communication relies on the modulation content contained within the signal. Maintaining a high modulation level is crucial in providing the highest possible efficiency from any transmitter operating on AM, FM, and SSB. Current two-way radios normally rely on microphones that inherently change audio levels delivered to the transmitter. This causes transmitter modulation to fluctuate greatly depending on voice level and pitch. This audio fluctuation lowers the average modulation* levels applied to the transmitter, resulting in less than optimal transmission range. *Average modulation levels for voice type transmissions are approximately 35-45% General Product Description: An electronic module that can be fitted to two-way radios that provides dynamic speech compression and limiting on transmit. The speech compression will provide a constant level (95-100%) of modulation to transmitted signals. The module will also incorporate a "noise gate" that will effectively eliminate background noise below a desired level. http://www.telstar-electronics.com/d...evelopment.htm |