G-9728 60HZ Telemetry System

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60 HZ Telemetry System

G-9728 Transceiver Module
G-9687 Low Frequency Amplifier

G-9728 Transceiver Module

The G-9728 60Hz Telemetry System consists of 3 internal modules: the power supply, the G-9728 Transceiver Module, and the G-9687A Low Frequency Amplifier. These modules form a system to transmit and receive 60Hz information for remote sensing of amplitude and phase information on feeder circuits.

The typical system contains a G-9728 Transceiver operating in a transmit mode. The G-9728 responds to 60Hz information through the G-9687 Amplifier. The G-9687 Amplifier at the transmit side is merely an isolated transformer stepping-down the line voltage to 5Vrms. The G-9728 Transmitter generates a tone based on the input. This linear scheme sends tones over a single pair of wires to the master site.

At the master receive site, the G-9728 Transceiver operates as a receiver and accepts the tones from the transmitter and generates a corresponding 60Hz waveform. The 60Hz waveform is used to drive the G-9687 Amplifier and in turn the loading device. The amplifier serves to boost the level of drive to 1 watt and transformer isolate the output load. A carrier detector contact is also provided to indicate when the tone has dropped below its threshold.

Specifications

Enclosure:1 Unit 19" Rack, 1U high, 10" deep, aluminum.
Power Input: 90-132Vac (115Vac), 180-264Vac (230Vac), 9-16Vdc (12Vdc), 19-32Vdc (24Vdc), 38-63Vdc (48Vdc), 85-140Vdc (120Vdc), 15 watts, max.
60HZ Level:110Vrms, nominal, ±15% input range, 0.01W maximum burden.
Temperature Range: 0° to +60°C.
Frequency Range: 40-80Hz.
Output Range:0-100Vrms, 1W maximum drive.
Distortion:Less than 5%<./LI>
Amplitude Accuracy: Better than 2%.
Isolation: To 1500Vrms.
Bandwidth required:800-2800Hz, less than 8dB variation.
Transmit level:+3dBm maximum into 600 Ohm.
Receiver sensitivity: -30dBm to +6dBm.
Carrier detector sensitivity:-40dBm to -10dBm, factory set to -26dBm.

G-9687ALow Frequency Amplifier

The G-9687A is a 60Hz amplifier that will deliver 2 watts at 110 volts to clocks and transducers for use in monitoring power networks for stability. A G-8728 60Hz Telemetry System is the normal source of the 60Hz input signal. The input signal is 5.0Vrms. The output load can be as low as 6000 Ohm. The G-8700 Power Supply can supply one G-9687A 60Hz, 2W Power Amp with ±12Vdc and requires ventillation holes and extra spacing of racks.

The power supply is mounted on Da-Tel standard 4 1/2 x 9 3/8 pc boards and requires 2" of panel space.

The G-9687A uses an Apex PA02 Power Operational Amplifier with a transformer and feedback network to amplify 60Hz at zero phase shift. On special order, the amplifier can be ordered with transformer and feedback networks for voice band use.

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