Instruction Manual
WIRELESS TUNER MODULE
WTU-770
WTU-771
GENERAL DESCRIPTION
The WTU-770 (WTU-771) is a wireless tuner module for TOA's VHP high band wireless
tuner model WT-770. 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 : 70 mA (max.)
Receiving frequency : 169.445 MHz~171.905 MHz (FCC Part 90/USA)
174.250 MHz~215.250 MHz (FCC Part74/USA, 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 dBµV
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 µV (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 : 40 × 20 × 106 mm (1.65" × 0.79" × 4.17")
Weight: 85 g (0.19 Ib.)
Standard accessory
Frequency label: 1
Specifications are subject to change without notice.
TOA Corporation
