The basic KR 87 system includes the KR 87 receiver, the KI 227 indicator with rotatable compass card and the aerodynamically designed KA 44B combined loop and sense antenna, plus mounting racks and connectors. The all solid-state KR 87 receiver will operate on any DC voltage from 11 to 33 volts. It draws only 12 watts power, so no external cooling is required. The standard KI 227 ADF indicator has an optically coated, non-reflecting glass lens that can be cleaned without scratching and has a manually rotated compass card. The KA 44B combined loop and sense antenna is an aerodynamically clean design, and greatly simplifies installation. It contains preamplifier and modular circuits which combine the antenna signals into a single input to the receiver. Cable is not critical and, as only one cable is required, this ADF system is simple and fast to install. The flight timer feature is a real aid for fuel management or dead reckoning on extremely long legs. It will measure flight time up to 59 minutes. The flight timer starts when power is applied to the unit through an avionics master, the unit's own ON/OFF switch optional external switch (like a gear strut switch or other device). Flight time will be displayed in the right hand window in place of the standby frequency when power is first applied. "FLT" will be annunciated Flight time may then be checked at any time during a flight, regardless of what is being displayed in the right window, simply by pressing the FLT/ET button to annunciate "FLT". The elapsed timer feature provides a separate programmable "stopwatch" function which is invaluable for timing a holding pattern, a nonprecision approach, or an individual trip leg. The elapsed timer can be programmed to clock forward from :00 or to count down from any preset time interval up to 59 minutes, 59 seconds. In the count down mode, when the elapsed timer reaches :00 the right hand display will alert you by flashing for 15 seconds as the timer starts counting up. An optional aural alarm (if installed) will be activated for about one second.
Size: 6.32"W x 1.35"H x 10.73"L
Weight: 2.9 lbs.
TSO Compliance: TSO C41c Class A, DO-160 Env. Cat A1D1/A/SKP/XXXXXX/ZBABA
Applicable Documents: RTCA DO-142
Frequency Range: 200KHz to 1799KHz in 1 KHz increments
Receiver Selectivity: 6dB bandwidth: +-2 KHz max off center frequency; 80dB bandwidth: +-7 KHz max off center frequency
Bearing Accuracy: +- 3 degrees from 70 uV/m to 0.5 V/m RF input signal level
Power Requirements: 11 to 33 VDC, 12W typical
Temperature Range: -20 to +55C
Altitude Range: Up to 50,000 feet
Receiver Senstivity: 150uV/m max for s+n/n = 6dB
Spurious Response: 80dB down +-12KHz from center frequency
Indicator Drive: DC sine and cosine voltages 4.5 +- 3.0VDC at 150mA max
Audio Output: 50mW across 500ohm
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