Toa WTU-770, WTU-771 Instruction Manual

Instruction Manual

WIRELESS TUNER MODULE

WTU-770
WTU-771

GENERAL DESCRIPTION

The WTU-770 (WTU-771) is a wireless tuner module fo r 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 k Hz Deviation)

Residual noise : Les s 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

Function of card edge pins

No.1 : Ground

No.2: RF Input

No.3 : +B power input (10V)

No.4: Ground

No.5 : Squelch output

No.6 : AF output

Note: (1) Refer to t he diversity tuner's operating instructions for installation and operation

of the tuner module.

(2) Be sure to refer the module installation to authorized service personnel.

TOA Corporation

KOBE, JAPAN

133-07-068-20