Specifications

Operation with a full charged, heavy-duty, 8.4-volt nickel-
cadmium rechargeable battery is also permissible. IM-
PORTANT: Do not use a “conventional” g-volt-sized
nickel-cadmium battery; its 7.2-volt output will operate
the transmitter for about 15 minutes. Carbon-zinc bat-
teries will also result in diminished operating life (about
1 hour).
Microphone Connections
The Shure WL83 lavalier condenser microphone or
similar microphones with identical wiring and a Switch-
craft TA4F type connector can be plugged directly into
the transmitter microphone jack. The WL83 will operate
using the transmitter’s regulated +5 Vdc available on
pin 2 (see Figure 2). Self-powered (battery) condenser
microphones can be used with the transmitter only if
they can be operated in an unbalanced mode (one side
grounded). Other non-self-powered condenser
microphones may require special wiring; contact
Shure’s Service Department for further information.
Phantom-powered condenser microphones will not
operate with the W10BT.
A high- or low-impedance dynamic or ribbon
microphone with pin 2 output can be directly connected
to the transmitter using the supplied WA310 microphone
adapter cable. The cable has a 3-socket XLR connector
on the microphone end and a Switchcraft TA4F connec-
tor on the transmitter end, and is wired for unbalanced
low-impedance operation only (see Figure 2). Shure high-
impedance microphones are not wired to operate with
the transmitter. If a Shure high-impedance microphone
must be used, pins 2 and 3 should be reversed (by
qualified service personnel). Using a low-output, low
impedance dynamic lavalier microphone such as
Shure’s SM11 may raise the mixer input gain ap-
preciably, which in turn may result in an increase in
noise and signal “pumping.”
Instrument Connections
To connect the transmitter to a guitar or other musical
instrument pickup, obtain an instrument adapter cable
such as Shure’s WA300. This cable has a 1/4-inch phone
plug on one end and a Switchcraft TA4F on the other
(see Figure 2), and should function normally with any
high-impedance instrument pickup.
TRANSMITTER CONNECTIONS AND
ACCESSORY WIRING
FIGURE 2
Battery Check
Turn the transmitter power on and depress the BAT-
TERY TEST Switch. The adjacent LED should light, in-
dicating adequate transmitter input voltage. If the LED
does not light, the alkaline battery voltage has dropped
below 7.25 volts and the battery should be replaced or
recharged (nicad only).
If the battery is tested periodically, the failure of the
LED to light indicates approximately one hour of battery
life left (alkaline only).
Polarity
With the Shure WL83 or a Shure low- or high-
impedance XLR-connector microphone connected
through a WA310 cable, positive pressure on the
microphone diaphragm results in positive voltage on pin
2 with respect to pin 3 of the receiver OUTPUT connec-
tor, and positive voltage on the tip of the AUX OUTPUT
connector (8-ohm and 10-kilohm positions) or negative
voltage on the tip (600-ohm position). Negative voltage
applied to the tip of a WA300 cable will also result in the
same output polarities.
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