Description
Features
- 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
- 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)
- It is possible to add capability to the KR-87 which enables it to drive two (2) KI-227 ADF Indicators:
- Unit Must Include Service Bulletin 6 for added capability
- Note: for 28V aircraft only
- May be interfaced to King KI-229 or KNI-582 RMIs
- Can be interfaced with other 3-wire RMI indicators by way of KDA-692 RMI adapter
- Single indicator driving capability
- ADF Superflag output for use with EFIS systems
- Internal timer for flight time and elapsed time which proves valuable for non-precision timed approaches, fuel management, dead reckoning navigation
- 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
- 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
- 14/28 volt display lamps
- Standard display lens
- Clear display light
- Forced air cooling not required
- TSO’d
- Silver Crown Plus version
Specifications
- Dimensions: 6.32″ (161 mm) x 1.35″ (34 mm) x 10.73″ (273 mm)
- Weight: 2.9 lbs. (1.3 kg)
- 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 +55°C
- Altitude Rande: Up to 50,000 feet
- Receiver Sensitivity: 150uV/m max for s+n/n = 6dB
- Spurious Response: <80dB down +-12KHz from center frequency/li>
- Indicator Drive: DC sine and cosine voltages 4.5 +- 3.0VDC at 150mA max
- Audio Output: 50mW across 500ohm
