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11. Specifications
11.1. WMS 61
11.2. WMS 81
HT 61 PT 61 SR 61
Carrier frequency 138 to 142 MHz/169 to 250 MHz
Modulation FM
Audio bandwidth 50 to 20,000 Hz
Frequency stability (-10°C to +50°C) ±10 ppm
Rated deviation 30 kHz (22.5 kHz AM)
T.H.D. at 1 kHz <0.8% <0.5%
Compander Yes
Signal/noise ratio typ. 50 dB(A) >100 dB(A)
Limiter Yes
RF output 10 mW
Current consumption typ. 150 mA 170 mA 220 mA
Power requirement 2x1.5 V AA size batteries 120/230 V AC, 50/60 Hz
Battery life >12 hours >10 hours
Input sensitivity typ. -95 dBm
Audio input level for rated deviation 350 mV/1 kHz 1400 mV/1 kHz
Input impedance 220 kΩ 220 kΩ//660 pF
Condenser microphone power supply 6 V/6,8 kΩ on pin 3
Squelch threshold -95 dBm (fixed)
Pilot tone 32.678 kHz 32.678 kHz
Audio output balanced XLR: switchable be
tween microphone and line
levels; typ. 30 dB
unbalanced XLR: 6 dBm
unbalanced 1/4” jack: 0 dBm
Size (WxDxH)
240 x 36 dia. mm (9.4 x 1.4 in.) 92 x 65 x 20 mm (3.6 x 2.6 x 0.8 in.) 210 x 170 x 42 mm (8.3 x 6.7 x 1.7 in.)
Net weight 245 g (8.7 oz.) 76 g (2.7 oz.) 470 g (16.6 oz.)
HT 81 PT 81 SR 81
Carrier frequency 710 to 869 MHz
Modulation FM
Audio bandwidth 50 to 20,000 Hz
Frequency stability (-10°C to +50°C) ±10 ppm
Rated deviation 30 kHz
T.H.D. at 1 kHz <0.5% <0.4%
Compander Yes
Signal/noise ratio typ. 50 dB(A) >100 dB(A)
Limiter Yes
RF output 10 mW
Current consumption typ. 170 mA 180 mA 240 mA
Power requirement 2x1.5 V AA size batteries 120/230 V AC, 50/60 Hz
Battery life >10 hours >8 hours
Input sensitivity typ. -95 dBm
Audio input level for rated deviation 350 mV/1 kHz 1400 mV/1 kHz
Input impedance 220 kΩ 220 kΩ//320 pF
Condenser microphone power supply 6 V/6,8 kΩ on pin 3
Pilot tone 32.678 kHz 32.678 kHz
Squelch threshold -95 dBm (fixed)
Audio output balanced XLR: switchable be
tween microphone and line
levels; typ. 30 dB
unbalanced XLR: 6 dBm
unbalanced 1/4” jack: 0 dBm
Size (WxDxH)
240 x 36 dia. mm (9.4 x 1.4 in.) 92 x 65 x 20 mm (3.6 x 2.6 x 0.8 in.) 210 x 170 x 42 mm (8.3 x 6.7 x 1.7 in.)
Net weight 245 g (8.7 oz.) 76 g (2.7 oz.) 470 g (16.6 oz.)
This product conforms to ETS 300.422 and ETS 300.445 as well as Parts 15 (receiver), 74, and 90 (traveler) of the FCC Rules.