ATU-500SR

Product catalog summary

Overview: The ATU-500SR is a 125 W Automatic Antenna Tuning Unit designed for use with Nautel Vector series transmitters. It offers remote monitoring and control capabilities, local control options, and is equipped with various interfaces for connectivity.

Remote Monitoring and Control: When used with Nautel Vector transmitters, the unit allows for remote monitoring of RF antenna current and inductive tune status. Remote control features include inhibiting the inductive tune servo and adjusting the inductive tune.

Local Control and Monitoring: The unit provides local control over the inductive tune servo and transmitter operations. Local monitoring includes status checks for the CPU, DC supply, and transmitter state.

Equipment Interface: The unit supports remote control and monitoring via RS485 serial communication. It includes connections for DC input, RF input, antenna feeder, and system ground.

Lightning Protection: Features include an adjustable spark gap, static discharge capabilities, and direct DC grounding at the antenna feeder.

Shipping and Options: The unit is export packed in a wooden crate, with options for a sunshield and extended warranty.

Technical Specifications:

Maximum Carrier Power: 200 W
Maximum Peak Envelope Power: 500 W
VSWR: <1.25:1 at carrier frequency
Frequency Range: 190 kHz to 1800 kHz
Automatic Tuning Range: ±5% antenna capacity variation
Input Impedance: 50 ohms nominal
Power Requirements: 24 V dc ± 5% at 1 A dc
Environmental Limits: Operating temperature from -50° C to +55° C, 0%-100% relative humidity

Physical Specifications:

Wall Mount Dimensions: 72.4 cm H x 63.5 cm W x 31.1 cm D
Base Mount Dimensions: 74.6 cm H x 60.4 cm W x 25.9 cm D
Weight: 18 kg unpacked, 29 kg packed

Standards and Compliance: The unit is IP66 rated, exceeds FAA9782/1 performance, and meets AAMA 603.8 and CGSB-1-GP-300 specifications. It is compliant with Green Passport requirements.

Reliability: The unit has an MTBF of ≥99,844 hours and an MTTR of ≤30 minutes. Field data indicates an MTBF in excess of 3,000,000 hours for Nautel NDB/DGPS systems.

Cooling and Environmental Adaptability: The unit is cooled by radiation from its sealed enclosure and is suitable for operation at altitudes up to 3048 meters.

Antenna Capacitance and Loading Coil Selection: The document provides a matrix for selecting loading coils based on antenna capacitance and frequency, with options for high and low inductance coils.

Catalog excerpts

125 W Automatic Antenna Tuning Unit Remote Monitoring (when used in conjunction with the Nautel Vector series transmitter) Equipment Interface Maximum Carrier Power Remote control/monitoring with RS485 serial communication (DB-9 connector with 5 connections and additionally available on Maximum Peak Envelope Power Inductive tune status terminal block). DC Input (terminal block) Remote Control (when used in conjunction with a Nautel Vector series transmitter) RF input - (N connector) Antenna feeder connection (mechanical bolt) Inductive tune servo inhibit Antenna system ground Increase/decrease inductive tune (mechanical bolt) Lightning Protection Static Discharge Local Control Direct DC Ground at Antenna Feeder to assist with static discharge requirements Inductive tune servo inhibit Increase/decrease inductive tune Export packed in wooden crate Transmitter On/Off when used in conjunction with the Nautel Vector series transmitter Local Monitoring Inductive tune servo inhibited All assemblies to remain in ATU for shipment Options Sunshield to reduce thermal load Extended warranty Maximum VSWR after fixed resistive match and Auto Reactive Tune <1.25:1 at carrier frequency Frequency Range Standard band: 190 kHz to 1800 kHz Automatic Tuning Range ±5% antenna capacity variation Input Impedance 50 ohms nominal Power Requirements 24 V dc ± 5% at 1 A dc, supplied from transmitter Maximum Series Loss Resistance Not greater than 1/200 x antenna reactance Antenna System Resistance 2 to 60 ohms Inductive tune status/limit Transmitter OFF Local/remote CPU ok DC supply status

Open the catalog to page 1

TECHNICAL SUMMARY 125 W Automatic Antenna Tuning Unit Dimensions Typical Antenna Capacitance Wall Mount Fiberglass Whip with no coil loading Insulated Tower without top loading guys Insulated Tower with top loading guys “T” Antenna (Note: span is twice height) (28 1/2” H x 25” W x 12 1/4” D) Base Mount 74.6 cm H x 60.4 cm W x 25.9 cm D (29 3/8” H x 23 3/4” W x 10 3/16” D) Weight 18 kg (40 lbs) unpacked 29 kg (86 lbs) packed Helipad Antenna IP66 rated Exceeds performance of FAA9782/1 Finish meets AAMA 603.8 an CGSB-1-GP-300 specification Compliant with Green Passport requirements MTBF Greater...

Open the catalog to page 2

ATU-500SR

ATU-500SR

Catalog excerpts

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