dicates a marginal signal condition; and green indicates
an acceptable level. Full-scale indication is desirable for
best signal-to-noise performance, but changes
throughout the green portion of the display will still
result in good operation. The receiver contains a squelch
circuit to eliminate unwanted signals or noise in the
absence of wireless transmitter signals. The squelch cir-
cuit is not user-adjustable; it is preset to an optimum
threshold setting of 1.0 µV, minimizing setting errors and
difficulties in returning the squelch to its original set-
ting.
LEVEL Rotary Control:
Adjusts the signal level at the
AUXILIARY OUTPUT Jack. The control operates in all IM-
PEDANCE Switch positions.
IMPEDANCE Rocker Switch: A three-position switch
for selecting the proper source impedance to the AUX-
ILIARY OUTPUT Jack. In general, the 8-Ohm position is
for monitor headsets, 600 Ohms for monitor headsets or
600-ohm line devices, and the 10K (10 kilohms) for high-
impedance devices such as effects units and guitar
amplifiers.
REAR PANEL
ANTENNA A, B UHF-Type Connectors: Provide for con-
nection to the two 5/8-wave vertical antennas supplied
with the W25DR. A 7.6-meter (25-foot) coaxial cable (sup-
plied) is installed between one antenna and the receiver
connector to remotely locate the antenna for optimum
dropout-free performance in diversity operation. Addi-
tional coaxial cables (WA280) can be connected for
greater total antenna separation if necessary.
FUSE 1/2A: This is a 0.5-ampere, 250-volt, 3AG-type,
fast-blow fuse that protects the power supply from ex-
cessive current. It should be replaced only with a fuse of
identical size and value (Littelfuse 312.500 or
equivalent).
MICROPHONE OUTPUT LEVEL Rotary Control: This
control determines the signal level at the OUTPUT Con-
nector when the MlC/LlNE Switch is in the Mic position.
Using this control, the signal level can be matched to
that of a conventional wired microphone.
MlC/LlNE Slide Switch: In the Line position, the
nominal (100% modulation) output level is not ad-
justable at the receiver and is used to drive 600-ohm
lines to mixers, amplifiers, etc. In the Mic position, the
output level is adjustable from -55 dBm to -16 dBm
using the MICROPHONE OUTPUT LEVEL Control. This
position is used to drive 150-ohm microphone-level lines.
POWER 13.5 VDC NEGATIVE GROUND Coaxial
Jack:
This connector accepts power from the supplied
power converter, or from any well-filtered 13.5 Vdc (200
mA) supply.
OUTPUT 3-Pin XLR Connector: Provides balanced out-
put for connection to the audio mixer or amplifier, de-
pending on the MlC/LlNE Switch position.
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