Val Avionics 5PRAWOS760 User Manual

AWOS 760 TRANSMITTER

Chapter

General Information

The AWOS 760 is a 760-channel communication transmitter designed to provide one
way communication within the frequency range of 118.000 MHz to 136.975 MHz in
25 kHz increments.

The AWOS 760-communication transmitter was designed to conform to FAA
Advisory Circular 150/5220-16B for use as a ground based VHF transmitter for
Automated Weather Observing Systems (AWOS).

The AWOS 760 communication transmitter has Federal Communications
Commission (FCC) type acceptance filed under FCC ID: EZN 5PRCOM760

The AWOS 760 consists of two major sections: Main Board and Transmitter Board.

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AWOS 760 TRANSMITTER

Specifications

Physical Dimensions: Width: 6.00 inches (15.24 cm)

Height: 1.9 inches (4.83 cm)

Length: 11.0 inches (27.94 cm)
Weight 5.0 Lbs. (2.27 kg)
Voltage: 12.0 Vdc
Current: Standby 200 mA; Transmit 1.5 A
Frequency Range: 118.000 to 136.975 MHz
Channel Spacing 25 kHz
Frequency Stability: . 001%
Spurious Emissions Greater Than 80 dB down from carrier
Modulation Adjustable (70 to 90% Typical)
Temperature Range -30 to +60 Degrees Celsius
Transmit Power: 2.5 watts
Emission 6K00A3E
Duty Cycle 100%
Design All Solid State. Printed Circuit Board & Point to Point Wiring.
Mounting Rigid Mounting, No Shock Mounting Required.
FCC ID EZN5PRAWOS760
Unit Part Number 803000

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AWOS 760 TRANSMITTER

Operation

CONTROLS:
ON/OFF SWITCH turns on and off the main power to the unit.
INDICATOR LIGHT Illuminates when the unit is power ed up.
DB-9 CONNECTOR connections for power, ground, mi c aud io, and transmit ke y are

made at this connector..
ANTENNA JACK connects to a broad band VHF 50 Ohm loaded ant enna
FREQUENCY CALIBRATION capacitor C427 can be adjusted to center the output

frequency.
MODULATION ADJUST potentiometer R423 can be adjusted to vary the

modulation level.
POWER ADJUST potentiometer R419 can be adj usted to var y the output power .
DIPSWITHCES M0-M4 selects the whole M Hz freque ncy (see t able, Ch apter 5)
DIPSWITCHES K2-K5 selects the tenth MH z frequ ency (see t able, Ch apter 5)
DIPSWITCHES K0-K1 selects the 25 kHz spacing (see table, Chapter 5)

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