6 Troubleshooting
26
Problem
Distortion.
Momentary loss of sound
(“dropouts”) at some locations
within performance area.
Possible Cause
1. (Bodypack transmitter
only:) GAIN control is set
too high or too low.
2. Interference from other
wireless systems, TV, radio,
CB radios, or defective
electrical appliances or
installations.
1. Antenna location.
Remedy
1. Turn GAIN control down or
up just enough to stop the
distortion.
2. Switch off interference
sources or defective appli-
ances or use a WMS 40
tuned to a different fre-
quency; have electrical
installation checked.
1. Relocate receiver. If dead
spots persist, mark and
avoid them.
7 Specifications
Carrier frequency range
Modulation
Audio bandwidth
Frequency stability (-10°C to
+50°C)
Rated deviation
T.H.D. at 1 kHz
Compander
Signal/noise ratio
RF output
Current consumption
Power requirement
Battery life
Input sensitivity
Audio input level for rated
deviation
Input impedance
Condenser mic power supply
Squelch threshold
Audio outputs
Size (WxDxH)
Net weight
HT 40
710 to 865 MHz
FM
40 to 20,000 Hz
±15 kHz
15 kHz
typ. 0.8%
Yes
typ. 103 dB(A)
10 mW
typ. 70 mA
2 x 1.5 V AA size
batteries
typ. 30 hours
-
100 mV/1 kHz
220 k
Ω
-
-
-
length: 258 mm (10 in.)
dia.: 40 mm (1.6 in.)
245 g (8.7 oz.)
PT 40
710 to 865 MHz
FM
40 to 20,000 Hz
±15 kHz
15 kHz
typ. 0.,8%
Yes
typ. 103 dB(A)
10 mW
typ. 70 mA
2 x 1.5 V AA size
batteries
typ. 30 hours
-
300 mV (MIC);
110 mV (LINE)
typ. 140 k
Ω
//450 pF
(LINE)
3.8 V/4.7 k
Ω
(pin 3)
-
-
64 x 22 x 96 mm
(2.5 x 0.9 x 3.8 in.)
76 g (2.7 oz.)
SR 40
710 to 865 MHz
FM
40 to 20,000 Hz
±15 kHz
-
typ. 0.8%
Yes
typ. 103 dB(A)
-
95 ±15 mA
120/230 V AC
50/60 Hz
-
typ. -95 dBm
-
-
-
-70 to -98 dBm
XLR bal. and
unbal. 1/4” jack:
adjustable from mic
to line level:
2 Vrms max.
235 x 142 x 43 mm
(9.3 x 5.6 x 1.7 in.)
470 g (16.6 oz.)