SR 81

15 selectable carrier frequencies make it easy to set up multichannel systems and avoid interference frequencies.
"Four level diversity" antenna management system for noise-free reception
Tone Code Squelch for noise-free reception
Inputs for external boosters or directional antennas
Rack mounting hardware included

The WMS 81 wireless system is a multichannel systems that allow you to use up to 24 channels* simultaneously. The modular system architecture provides for custom solutions for every conceivable application.
The WMS 81 operates in the UHF range. SAW filters and 15 selectable frequencies ensure interference-free operation. An intelligent battery management system monitors the transmitter battery voltage and computes residual capacity. A pilot tone system transmits battery data to the receiver to control the Tone Code Squelch and Automuting functions.

*The maximum number of channels you may use depends on local frequency plans.

SR 81 Receiver
The receiver shall have 15 selectable frequencies within a switching bandwidth of 3 MHz. Audio output level and Squelch threshold shall be adjustable on the front panel. The receiver shall be provided with an automatic squelch circuit (Tone Code Squelch) controlled by a pilot tone transmitted by the transmitter and a four-level battery capacity meter. The receiver shall have an audio bandwidth between 50 and 20,000 Hz and THD of max. 0.5 % (at 1 kHz). It shall have an A-weighted S/N Ratio of more than 100 dB. For easy rack mounting the receiver shall come in a 1/2 19" housing. Rack mount accessories and a blank panel shall be included.

Carrier frequency range	710 to 865 MHz
Audio bandwidth	50 to 20,000 Hz
THD	typ. <0,8 %
Signal/noise ratio	typ. >108 db(A)
Modulation	FM
Audio outputs	balanced XLR switchable to mic or line level; 30 dB typ. unbalanced 1/4" jack: 0 dBm; unbalanced XLR level: 6 dBm
Dimensions	210 x 170 x 42 mm / 8.3 x 6.7 x 1.7 in.
Net weight	470 g / 16.6 oz.