Filser Electronic GmbH
Gewerbestraße 2
ATR 720 C Communications Transceiver
86875 Waal
page 3
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1
SECTION GENERAL INFORMATION
1.1
INTRODUCTION
This manual contains information relative to the physical, mechanical and electrical characteris-
tics of the communications transceiver ATR 720 manufactured by Filser Electronic GmbH .
1.2
PURPOSE OF EQUIPMENT
The ATR 720 C COMM combines in a single panel mounted unit a 720 channel VHF COMM
Transceiver with a microprozessor controlled frequency entry
1.3
DESIGN FEATURES
A. Controls
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Multi Function Control
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On Off Switch
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Volume Control
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Automatic squelch eliminates pilot responsivility for continuously monitoring squelch
adjustment. Squelch threshold automatically adjusts to open on readable signals. SQ
switch in pulled opens squelch to test COMM receiver sensitivity and to listen ex-
tremely weak signals.
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Liquid Cristal Display
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Keyboard with 15 keys for Function, Frequency Entry
B. Electronics
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Variactor diode tuned filters eliminates use of mechanical tuning shafts and mecha-
nisms.
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Transistorized transmitter provides 4 watts minimum output power and long term re-
liability superior to tube designs.
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The digital frequency synthesizers utilize state of the art integrated circuits to replace
all but 1 crystal.
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Crystal filter selectivity.
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Carrier controlled squelch with carrier squelch back up functionally described above.
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Tight AGC (typically 0.5 dB from µV to 100 mV) minimizes audio level variations.
C. Construction
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Modular construction for simple maintenance.
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Rack mounted, removable from the front panel.
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Anti-theft locking mechanism.
