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Powerful handheld transmitter with a lightweight aluminum housing, increased bandwidth and transmission power, and integrated mute switch for evolution wireless G4 300 Series systems, delivering exceptional speech intelligibility in Business and Education. Architect's Specification. The handheld transmitter is for use with a companion receiver as part of a wireless RF transmission system. The handheld transmitter operates within ten UHF frequency ranges, with a switching bandwidth of up to 88 MHz:470 - 558 MHz, 520 - 558 MHz, 558 - 608 MHz, 558 - 626 MHz, 606 - 678 MHz, 626 - 698 MHz, 718 - 790 MHz, 790 - 865 MHz, 806 - 810 MHz, 925 - 937.5 MHz; transmission frequencies is 2,880 per range and shall be tunable in 25 kHz steps. The handheld transmitter features 20 fixed frequency banks with up to 32 compatible frequency presets and 6 user banks with up to 32 user programmable frequencies. The handheld transmitter is menu-driven with a backlit LCD display showing the current frequency, frequency bank and channel number, metering of AF level, transmission status, lock status, pilot tone transmission, muting function, and battery status. An auto-lock feature is provided to prevent settings from being accidentally altered. The handheld transmitter parameters are programmable in the handheld transmitter menu. Receiver parameters such as receiving frequency, receiver name and pilot tone setting are synchronizable with the handheld transmitter via an integrated infrared interface. The handheld transmitter is with a mute switch, which is switchable between AF on/off , RF on/off , Push to mute , Push to talk and Disabled via the user interface. Nominal/peak deviation is +/-24 kHz/ +/-48 kHz. Frequency stability is %3C= +/-15 ppm. RF output power at 50 Ohm is switchable between 10 mW (typical, low) and 30 mW (typical, standard) and 50 mW (typical, high). The handheld transmitter incorporates the Sennheiser HDX compander system and a defeatable pilot tone squelch. Audio frequency response ranges from 80 - 18,000 Hz. Signal-to-noise ratio at 1 mV and peak deviation is %3E= 115 dBA. Total harmonic distortion (THD) is %3C= 0.9 %. Input sensitivity is adjustable within a 48 dB range in steps of 6 dB. Power is supplied to the handheld transmitter by two 1.5V AA size batteries or by one Sennheiser BA 2015 rechargeable accupack. Nominal voltage is 2.4 V, current consumption is typical 180 mA at nominal voltage; %3C= 25 micro A when handheld transmitter is switched off. Operating time is typical 8 hours. The handheld transmitter has a rugged metal housing; dimensions are approximately 50 mm (1.97 ) in diameter and 265 mm (10.43 ) in length. Weight including the batteries is approximately 450 grams (0.99 lbs). Operating temperature ranges from -10 Degree C to +55 Degree C (+14 Degree F to +131 Degree F). A range of microphone heads are available for the handheld transmitter. The handheld transmitter is the Sennheiser SKM 300 G4-S.