Catalog No:

Manufacturer: BENDIXKING

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, in addtion to 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 is a real aid for fuel management or dead reckoning on extremely long flights. The flight timer 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 can 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 announce "FLT". The elapsed timer supplies 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.


  • Digitally tuned solid state automatic direction finder which provides bearing information to stations in the frequency range of 200 KHz to 1799 KHz and which also provides audio reception to enable pilot to identify stations
  • Used with KA-44B combined loop/sense low profile ADF antenna OR KA-44 blade antenna
  • Automatic dimming circuit adjusts the brightness of the display to compensate for changes in the ambient light level
  • Coherent detection design rejects unwanted frequency interference, achieves significantly greater range and has less suspectiblility to engine noise, static and atmospheric interference
  • Can be interfaced with other 3-wire RMI indicators by way of KDA-692 RMI adapter
  • Models available with single or dual indicator driving capability (see table below)
  • Models available for 28 volt use only (see table below)
  • Can be used with single needle KI-227 ADF indicator or dual needle KI-228 indicator (both indiactors available with manual or slaved compass cards)
  • May be interfaced to King KI-229 or KNI-582 RMIs
  • Models available with ADF Superflag output for use with EFIS systems (see table below)
  • Internal timer for flight time and elapsed time which proves valuable for non-precision timed approaches, fuel management, dead reckoning navigation
  • Flip-flop frequency display allows to switch between pre-selected "standby" and "active" frequencies
  • Operates on any voltage from 11-33 VDC with 12 watts power consumption
  • Models available with 5 volt display lamps (see table below)
  • Models available with standard or shiny display lens (see table below)
  • Models available with clear or blue display light (see table below)
  • Models available with backlit nomenclature (see table below)
  • Forced air cooling not required
  • TSO'd


Size: 6.32"W x 1.35"H x 10.73"L

Weight: 2.9 lbs.

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

TSO Compliance: TSO C41c Class A, DO-160 Env. Cat A1D1/A/SKP/XXXXXX/ZBABA

Altitude Range: Up to 50,000 feet

Applicable Documents: RTCA DO-142

Frequency Range: 200KHz to 1799KHz in 1 KHz increments

Power Requirements: 11 to 33 VDC, 12W typical

Temperature Range: -20 to +55C

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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