M: The signal delivered by the micro-
phone is muted while power and the
RF carrier frequency remain on. This
prevents the receiver from respond-
ing to interference from other trans-
mitters.
OFF: Power to the transmitter is off.
2 Status LED: Indicates battery status.
LED flashes momentarily upon swit-
ching ON and extinguishes: battery is
OK.
LED lights constantly: battery will be
dead in about 60 minutes.
3 Input Gain: This rotary pot sets the
sensitivity of the transmitter’s audio
section.
4 Battery compartment for one 1.5-V
AAA size battery (supplied).
5 Charging contacts for charging a
rechargeable battery inside the bat-
tery compartment using the optional
CU 40 charger.
6 Clip for securing the transmitter
inside a shirt pocket or in an outside
breast pocket of a jacket.
The color of the clip indicates the car-
rier frequency of your transmitter:
Frequency Color
US54: 710.400 MHz reddish brown
US58: 734.600 MHz purple
KR3: 745.650 MHz mint green
KR4: 750.900 MHz dark gray
EU62: 802.525 MHz Bordeaux red
EU63: 812.800 MHz yellow
SP1: 848.750 MHz light blue
SP2: 851.750 MHz yellowish green
UK69A: 854.900 MHz violet
UK69B: 858.200 MHz green
ISM1: 863.100 MHz melon yellow
ISM2: 864.375 MHz gray
7 Microphone
8 Cable compartment lid: The cable
compartment beneath the lid holds
the microphone cable (approx.
8 inches/20 cm long).
12
Fig. 1: MP 40 controls.
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