Realist 43-212 - User Manual

The Realistic FM Wireless Intercom is a 2-unit, wireless, solid-state intercom system designed for convenient communication within a home or office environment. It operates on a minimum power consumption and boasts a maximum life, utilizing 8 transistors and 1 Zener diode, plus 5 diodes (including 2 power rectifiers). The system is designed to be simple to operate and install, requiring only to be plugged into a standard 120 volts (220/240 volts 50 Hz) AC outlet. The sets are marked on the rear to indicate the correct voltage.

Function Description:

The primary function of this device is to enable two-way communication between different locations without the need for extensive wiring. It uses FM modulation for clear signal transmission. The system is equipped with a built-in squelch circuit to minimize background noise and ensure clear audio. A "hands-free" long transmission lock button allows for continuous communication, making it suitable for monitoring purposes such as baby sitting, dictation, or general observation. A lighted TALK bar provides visual indication when the unit is transmitting.

Important Technical Specifications:

• Power Output: 300 mW at 1 kHz (with 10% THD)
• Signal-to-Noise Ratio: 50 dB at 7 mV input
• Transmitting Section Frequency: 200 kHz ± 1 kHz (193 kHz ± 1 kHz)
• RF Output Power: 55 mW across 10 ohm load
• Semiconductor Complement:
  • 8 Silicon Transistors
  • 4 Diodes (1 Varicap Diode)
  • 2 Rectifiers
  • 1 Varistor
• Power Requirements: 120 Volts, 60 Hz, AC, 8 Watts Max. (220/240 VAC, 50 Hz, 8 Watts Max.)

Usage Features:

• Installation and Operation: These units are designed to be located almost anywhere in a house, office, or shop, as long as there is an AC outlet conveniently available. To determine the best location, users should plug each unit into AC outlets (120 volts, 60 Hz or 220/240 volts, 50 Hz where the sets are so marked on the rear) and test for optimal performance.
• Adjusting Volume: To talk, press the TALK bar and speak in a normal voice from arm's length (or less if desired, but not less than 3-5 inches (7 x 13 cm)) from the speaker/mic. At the receiving station, adjust the VOLUME as desired.
• Call Button: To call a station, press and release the CALL button. This produces a tone in the other unit and thus signals a call is ready. When the other station answers, press TALK and proceed with your message.
• Lock Button: For long messages, press the LOCK button down. This locks-in the Talk function for hands-free operation. To listen, press the TALK bar to release the LOCK button. The LOCK position is handy for use as a "baby sitter" or other monitoring functions, or for long periods of dictation. Thus, you can set one unit to LOCK and then listen from another unit.
• Operational Notes:
  • Additional intercom units can be added to the system if desired; however, they must be of the same type (other types of wireless intercoms will not work with this FM system).
  • These intercoms can be installed anywhere in the house, office, or shop, as long as they are all connected to the same power line distribution transformer. Practically all residential and many commercial locations meet this requirement. Do not operate them too close together, or feedback between units will cause squeal.
  • Units can be separated up to about 300 feet (90m), as long as the AC line is connected to the same side of the power distribution transformer. Thus, they may operate between adjacent homes, assuming their power comes from the same distribution transformer.
  • If communications are distorted, it may be due to talking too close to the speaker/microphone. Speak in a normal voice 1-3 feet (30-90cm) from the intercom for best results.
  • An adjustable squelch control is accessible through a hole in the back of the case. For normal conditions, no adjustment is required (the factory setting will be adequate). However, for optimum results, especially in very quiet or very noisy locations (electrical noise), adjust the squelch as follows: With the unit plugged in and no signal, adjust the squelch with a small screwdriver until a hiss is heard. Slowly turn in the opposite direction to the point where the hiss just ceases. This is the optimum setting for your location.

Maintenance Features:

• Radio Shack Limited Warranty: The device is warranted against defects for 90 days from the date of purchase. Within this period, Radio Shack will repair it without charge for parts and labor. Simply bring your sales slip as proof of purchase date to any Radio Shack store. The warranty does not cover transportation costs, nor does it cover equipment subjected to misuse or accidental damage. This warranty provides specific legal rights and may also grant other rights which vary from state to state. Radio Shack emphasizes "We Service What We Sell."