The M-72 base station adapter was designed to add flexibility and variety to the M-72 wireless microphone transmitter. The M-72 wireless microphone transmitter conveniently plugs into the back of base station adapter enabling the M-72 transmitter to operate in a permanent, A.C. powered installation and, if necessary, with an external antenna. This "base stationed" transmitter accepts its audio input for any line level output (microphone level optional) audio system and transmits this signal to any Com-Tek receiver. The base station adapter is equipped with R.F. output indicator the monitors normal R.F. output level and a modulation meter to insure normal modulation for maximum signal-to-noise performance. While it is self-contained for portable applications, it may be rack mounted for permanent installations. The base station adapter allows the M-72 wireless microphone transmitter to be used in a variety of applications. In churches theaters, and auditoriums, it retransmits the audio from the sound system to the hearing-impaired. It may also be used as part of a wireless intercom system for duplex communications, as a transmitter to monitor live soundtrack, or as a base transmitter providing a wireless audio point-to-point link. Specification: Audio Input:  Line level +5 dBm or speaker level up to 50 volts (microphone level optional) Connectors: XLR-3 for line level (microphone level optional), RCA connector for high speaker level Operation Indicators: Meter displays audio input (modulation) LED displays normal R.F. power output Antenna: Telescopic antenna mounts directly into top of transmitter or optional external antenna through type "F" R.F. connector. Power Requirements: 115V A.C. or optional 12V D.C. battery pack Dimensions: 8" wide, 71/2" deep, 21/2" high (203 mm x 190 mm x 63 mm), a rackmounting adapter kit is available (RMK-1) for standard 19" rackmount System Performance with Com-Tek Receivers: Frequency Response: 40 Hz to 15 KHz Audio Distortion: Less than 1% at 80% modulation Signal-to-Noise Ratio: Better than -70 dB with MR-72 receiver Operating Range: Typical range of 500 feet when used with Com-Tek receivers