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WIRELESS TUNER MODULE
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)
Receiving circuit: Single superheterodyne circuit
Antenna input impedance : 75 ohms, unbalanced
Receiving sensitivity : Under 20 dBµV (S/N : 75 dB/Deviation : 15 kHz)
Squelch sensitivity : 14 dBuV
Maximum deviation : 15 kHz (FCC Part 90/USA, DOC/CANADA, DOC 60/AUSTRALIA)
Dynamic range (SNR): Better than 90 dB (102 dB: A-weight)(60 dBµV, 15 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.
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)
(S/N : 80 dB/Deviation : 40 kHz)
40 kHz (FCC Part 74/USA, MPT 1345/UK)
: Better than 95 dB (102 dB : A-weight)(60 dBµV, 40 kHz Deviation)
TOA Corporation
Instruction Manual
WTU-870
WTU-871
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Summary of Contents for Toa WTU-870
- Page 1 WIRELESS TUNER MODULE 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.
- Page 2 No.9: Ground No.10: RF input A Note: (1) Refer to the 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 133-07-069-90...
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