Interphone System Operating Procedure

Questions and Answers

What is the purpose of adjusting the volume control in the interphone system?

To prevent feedback noise during transmission

To set the interphone system to standby mode

To control the external communication with command

To ensure all crew members can hear clearly (correct)

What action should the gunner take if a crew member needs to talk to the commander?

Handle the communication without informing the commander

Directly relay the message to the commander

Immediately switch to the transmission mode

Adjust the selector switch to common listening (correct)

Which position should the commander keep the selector switch on when communicating outside?

On 895

On 889 or 892 (correct)

On 880

On reception mode

What must infantry commanders do to communicate effectively through the interphone system?

Inform the gunner before talking to the commander Signup and view all the answers

What should the crew member do before using the interphone system in a noisy environment?

Wear a helmet and tie the elastic securely Signup and view all the answers

Which control box is primarily utilized by the commander for external communication?

Control box number-1 Signup and view all the answers

What function does control box number-3 serve in an emergency?

Allows the driver and operator to communicate with the commander Signup and view all the answers

What should crew members hear when the interphone system is functioning properly?

Light mesh in their earphones Signup and view all the answers

What should be done before and after communication with the radio set?

Check the radio set and its accessories. Signup and view all the answers

In which situation should the radio set be stored in a dry and draughty warehouse?

If it has not been used for a long time. Signup and view all the answers

What is the correct action if the operating check switch indicates abnormality?

Check the operating state and adjust if necessary. Signup and view all the answers

What is the recommended reception to transmission time ratio?

1:3. Signup and view all the answers

What should you do while adjusting the squelch knob during operation?

Turn it slowly clockwise until noise is suppressed without turning to the end. Signup and view all the answers

When changing the channel in receiving mode, what should occur?

The antenna tuning unit should automatically adjust to the matching band. Signup and view all the answers

What is the correct indication for the meter needle in transmitting mode?

The needle should point at the 250V + 20 position. Signup and view all the answers

What should be done if the radio set fails to meet technical specifications after being stored?

Make the necessary adjustments before use. Signup and view all the answers

What happens to the pointer when the power switch is turned to low and high-power positions?

The pointer should point between 150A and 500A. Signup and view all the answers

Study Notes

Operating Procedure of Interphone System-803

Adjust selector switch on control box number-1 and gunner control box number-2 to power on.
Ensure light mesh is audible in earphones for proper functioning.
Volume control must be adjusted according to crew needs.
All crew members can communicate; seated member should hear his own side tone.
Sending and receiving can occur via control boxes when selector is on 889 or 892.
Commander uses control box number-1 for external communication, with switch set to 889 or 892 for transmission.
Gunner adjusts selector for common listening when crew needs to talk to the commander.
Control box number-3 allows operator and driver to communicate with the commander in emergencies.

Operating Procedure VRS - 889

Wear helmet with laryngophone pressed closely to throat and earphones fitted properly.
Secure helmet with elastic to minimize noise during tank movement.
Connect helmet plug to chest switch set to ‘reception’.
Control box number-1 must be set to 889 and box number-2 to Inter Communication.
Power supply must be switched on; frequency window lights up.
Turn squelch circuit switch clockwise; earphones should produce noise.
Ensure ‘frequency unlock’ and ‘mismatch indicator’ lamps are off.
Check operating conditions: receiving mode at 'PS' and '+5V', should indicate 250 + 20.
For transmitting mode, set switch to '24V' and expect 250V +20 indication.
Power switch for high/low mode should indicate 150A to 500A.
Channel changing should lead to automatic adjustment of antenna tuning unit.
Adjust squelch to suppress noise without turning it all the way to end.
Wait one second after establishing squelch to transmit to avoid distortion.
Adjust power mode to match communication range, avoiding prolonged use at high temperature.
If used in low temperatures, power on radio set prior to communication for a few minutes in receiving mode.

Part-5.a Routine Operating Maintenance

Conduct thorough checks of radio set and accessories, including antenna and its base before and after communication.
Ensure shock mounts are intact and crew helmets are fastened securely.
Use operating check switch and meters on the panel to confirm normal radio operation; address abnormalities.
Maintain a ratio of transmission to reception at 1:3, limiting each communication session to 5 minutes.
Clean the equipment after use and log operating time.

Preventive Maintenance

Conduct fault checks after every 500 hours of use.
Repeat the operating procedure to identify faults; prior faults necessitate sending the set to workshop.
Store unused sets in a dry, draft-free environment.
Measure electrical characteristics of long-stored sets prior to use; adjustments made if specifications not met.
Ensure proper functioning of squelch, volume, and antenna tuning unit.
Avoid switching off power supply in transmitting mode or changing the power selector switch during transmission.

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Description

This quiz covers the operating procedures for the Interphone System-803. It includes adjustments for the selector switch, volume control, and communication protocols among crew members. Test your knowledge on the essential steps to ensure effective communication using the system.