Instruction Manual
WIRELESS TUNER MODULE
WTU-870
WTU-871
GENERAL DESCRIPTION
The WTU-870 (WTU-871) is a wireless tuner module for TOA's VHF high band diversity
tuner model WT-870. To ensure its reliability, it employs a compressor/expander system
noise reduction circuit to minimize the influence of high-frequency noise generated from
digital equipment such as personal computers and word processors, as well as a
combined noise/tone squelch circuit.
SPECIFICATIONS
Power supply : 10V DC
Current consumption : 130 mA (max.)
Receiving frequency : 169.445 MHz-171.905 MHz (FCC Part 90/USA)
174.250 MHz-215.250 MHz (FCC Part 74AJSA, DOC/CANADA)
173.8 MHz-175.0 MHz (MPT 1345/UK)
202.1 MHz-203.7 MHz (DOC 60/AUSTRALIA)
Receiving circuit: Single superheterodyne circuit
Antenna input impedance : 75 ohms, unbalanced
Receiving sensitivity : Under 20 dBµV (S/N : 75 dB/Deviation : 15 kHz)
(S/N : 80 dB/Deviation : 40 kHz)
Squelch sensitivity : 14 dBuV
Maximum deviation : 15 kHz (FCC Part 90/USA, DOC/CANADA, DOC 60/AUSTRALIA)
40 kHz (FCC Part 74/USA, MPT 1345/UK)
Dynamic range (SNR): Better than 90 dB (102 dB: A-weight)(60 dBµV, 15 kHz Deviation)
: Better than 95 dB (102 dB : A-weight)(60 dBµV, 40 kHz Deviation)
Residual noise: Less than 30 µ V (8 µV: A-weight)
Output level: 0 dBV (Maximum deviation, 2.2k ohms load)
Distortion : Less than 1 %
Temperature range : -10 °C~50 °C (14 °F~122 °F)
Dimensions : 60 x 25 x 139 mm (2.36" x 0.98" x 5.47")
Weight: 155g (0.34 Ib.)
Standard accessory
Frequency label: 1
* Specifications are subject to change without notice.
TOA Corporation
