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Electro Magnetic Telephone The magneto telephone continues to play an important role in critical areas either as the main means of communication or as a back-up system. Continual design improvements ensures its usefulness in intensifying situations. Our vast experience and user feedback from across the world have prescribed the features of our latest model M-12, which includes
- Durable piezo ringer for efficiency and penetrating sound
- Ringer operates even if handset is left off-hook
- Identical dynamic receiver and transmitter.
- Micro-switch mechanism for generator change-over.
Endearing features of magneto telephones are long distance capability and ability to work with out a centralized exchange, thereby eliminating the chance of total network failure. Even the power supply is local to reach telephone, and can be just a pair of flashlight batteries. Optionally the power required can be produced by its own generator. Technical Specifications
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Parameter
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Specification IRS TC 36/97 limits
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M-12performance
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Power supply range
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1.5 to 3 VDC
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1.6 to 16VDC
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Nominal current @ 3V
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<25mA
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<20 mA
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Insulation @ 500VDC
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>5 mega ohms
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>500 mega ohms
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Send Amplification @ 5mV
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>774 mV (+43.8dB)
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>800 (+44 dB)
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Receive Amplification @ 193mV
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>100 mV (-5.7 dB)
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>137 mV (-3 dB)
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Side-Tone Suppression
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<100 mV (-12.0 dB)
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<100 mV (-12 dB)
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Insertion loss on-hook
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<18 mV (0.1 dB)
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<2 mV (0.02 dB)
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Insertion Loss Off-hook
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<68 mV (0.8dB)
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<68 mV (0.8dB)
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Generator Output-open
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>80V AC
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>80V AC
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Generator Output-max load
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>28V AC
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>30V AC
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Dynamic working range @3Vps
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>20 dB
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>20 dB
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