Narco Avionics MK12D TSO - Introduction and Description; MK12 D TSO Product Description; MK12 D TSO Features Overview; Installation Procedures

OCTOBER 1996
REV. D
3
1.0 INTRODUCTION
1.1 DESCRIPTION
The MK-12D TSO ( replacement radio ) referred to here on as MK-12DR, is a
modified version of the MK12D Cessna replacement radio. The MK-12DR is a direct
replacement for the NARCO MK12, MK12A, and MK12B NAV/COMS.
1.2 FEATURES
GENERAL
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Active channel keep alive ( when connected ).
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Bright sunlight readable display.
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Flip-Flop frequency entry.
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Direct slide in replacement for the MK12, MK12A, MK12B.
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14v or 28v units available.
COM
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760channel TSO'd VHF transceiver.
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7 watts nominal transmit power ( 10W typical ).
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0.003% frequency stability.
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Automatic squelch with manual override.
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50mw phones output.
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10 watt audio amplifier.
NAV
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200 channel TSO'd NAV receiver.
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Glideslope channeling ( 2 of 5 or Narco 11 wire ).
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DME channeling
2.0 INSTALLATION
2.1 INTRODUCTION
The MK-12DR is a direct replacement for the MK12, MK12A, MK12B NAV/COM
units. It's specifications meet or exceed those of the unit it is replacing.
2.2 TECHNICAL SPECIFICATION AND PERFORMANCE ADJUSTMENTS
The MK-12DR is a specially modified MK-12D Cessna unit. The mechanical
modifications effect the physical size, latching method, and interconnections. The
electrical modifications concern the NAV receiver ( level and phase ), deleting the
vor and Localizer converters, and adding selectable Glideslope channeling ( 2 of 5 or
Narco 11 wire ). All pertinent adjustment information can be found in the MK-12D
TSO maintenance manual ( P/N 03118-620, December 1988 or later )
2.2.1 SPECIFICATION DIFFERENCES
WEIGHT: 5.8 lbs.
14V- Receive current: 1.0 amps Transmit current: 4.3 amps
28V- Receive current: 0.5 amps Transmit current: 2.5 amps
NAV receiver output level ( VOR): 3.0V rms