071-1234-00

071-1234-00 BendixKing KA 44B ADF antenna

071-1234-00 is the exact Part Number for this BendixKing KA 44B combined loop and sense antenna. The low-profile external unit receives non-directional-beacon and commercial broadcast-band signals for a compatible automatic direction finder. Its internal loop, sense element, preamplifier and modulator provide the directional information required by the connected ADF receiver.

The KA 44B is an antenna assembly, not an ADF receiver or cockpit indicator. It is documented for compatible KR 87 and KDF 806 installations, with KI 227 or KI 228 indicators used in suitable system configurations. The aircraft skin location, mounting plate, gasket, cable, bonding and receiver wiring are essential parts of the installed system.

Combined loop and sense operation

The loop element produces a directional response with two possible bearing directions. The sense element supplies the information needed to resolve that ambiguity. Inside the KA 44B, the preamplifier and modulator combine the loop and sense signals so one receiver input can carry the information required for automatic bearing computation.

A simplified signal chain is radio beacon → KA 44B loop and sense elements → internal preamplifier and modulator → KR 87 or KDF 806 receiver → KI 227 or KI 228 bearing indication. The receiver processes the modulated antenna signal and drives the cockpit indicator. Each item performs a different function and none is interchangeable with the antenna.

Bearing accuracy depends on antenna location, aircraft symmetry, bonding, cable condition and freedom from electrical interference. Structure, wiring, lighting equipment or transmitters near the antenna can introduce quadrantal error or noise. Correct installation and calibration are therefore as important as antenna serviceability.

Electrical, environmental and dimensional data

Published KA 44B data list a 9 VDC supply at approximately 80 mA, supplied by a compatible KR 87 receiver in the documented installation. The antenna is qualified to TSO C41c Class A. Environmental information includes operation after exposure to at least 95 percent relative humidity at 50 °C for 48 hours under the specified qualification conditions.

Published overall dimensions are approximately 11.60 inches long by 6.00 inches wide, with maximum height reported around 1.87 to 2.10 inches depending on the reference and measurement point. Published weight is approximately 4.2 lb, or 1.91 kg. The low profile reduces external drag while leaving sufficient volume for the loop, sense and electronics.

Installation references include cable assembly 200-2586-04 with an approximate length of 48 feet, mounting plate 047-4956-03 and gasket 187-1227-00. These parts are related installation hardware and are not included unless the quotation specifically lists them.

Mounting, variants and inspection

The antenna mounts to the aircraft exterior using the approved plate and sealing arrangement. The installer must follow the structural drawing for orientation, hole pattern, fastener torque, corrosion protection and weather sealing. Correct bonding and cable routing help prevent noise and bearing error. Water intrusion or a damaged gasket can affect both the antenna electronics and aircraft structure.

Published variants include 071-1234-01, which combines the same basic antenna with a grounding ring, and 071-1234-02 with a vertical quadrantal-error adjustment. These differences may affect installation and calibration. No cross-suffix interchangeability is claimed without approved data.

Receiving inspection should confirm Part Number 071-1234-00, model KA 44B, radome condition, mounting holes, connector, underside sealing surface and original markings. Installed testing should cover receiver sensitivity, bearing operation, station identification, quadrantal-error calibration and noise with aircraft electrical systems operating.

Serviceable partner-stock supply and ordering

This 071-1234-00 KA 44B is offered in Serviceable condition from partner stock with a six-month warranty. Exact serial number, paint and radome condition, connector, mounting hardware, cable, grounding provisions, tag date, traceability and release authority are confirmed for the allocated unit before order acceptance.

For an inquiry, specify Part Number 071-1234-00, model KA 44B, aircraft type, installed KR 87 or KDF 806 system, required cable and mounting plate, documentation and quantity. Related ADF receivers, indicators and antennas can be reviewed in the Garmin / BendixKing / Honeywell / Collins category. Related equipment shares a system function but is not presented as interchangeable.

Product Type: Combined ADF loop and sense antenna

Manufacturer: BendixKing / Honeywell

Model: KA 44B

Designation: 071-1234-00

Alternative Designations: 071123400; KA44B; KA-44B; Bendix/King KA 44B

Primary Function: Directional reception of NDB and compatible broadcast-band signals for an ADF receiver

Internal Elements: Loop element, sense element, preamplifier and modulator

Associated Receivers: KR 87 / KDF 806 in compatible approved installations

Associated Indicators: KI 227 / KI 228 in compatible approved installations

Typical Signal Chain: Beacon → KA 44B → KR 87 or KDF 806 → KI 227 or KI 228

DC Power Supply: 9 VDC supplied by compatible KR 87 installation

Current Consumption: Approximately 80 mA

Approximate Length: 11.60 in / 294.6 mm

Approximate Width: 6.00 in / 152.4 mm

Approximate Maximum Height: 1.87 to 2.10 in / 47.5 to 53.3 mm depending on reference

Published Weight: Approximately 4.2 lb / 1.91 kg

Qualification: TSO C41c Class A

Humidity Qualification Reference: At least 95% RH at 50 °C for 48 h

Cable Assembly Reference: 200-2586-04, approximately 48 ft

Mounting Plate Reference: 047-4956-03

Gasket Reference: 187-1227-00

Related Version 071-1234-01: Basic antenna with grounding ring

Related Version 071-1234-02: Version with vertical quadrantal-error adjustment

Interchangeability: Verify exact suffix, grounding, QE adjustment, cable, mounting and aircraft approval

Condition: Serviceable

Warranty: 6 Months

Technical Documentation: Applicable BendixKing KA 44B / KR 87 / KDF 806 installation and maintenance data

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For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.

Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.