HF ANTENNA COUPLER FOR USE ON A CIVIL AIRCRAFT. THE COUPLE ENABLES MATCHING OF THE AIRCRAFT HF SHUNT-TYPE ANTENNA WITH THE OUTPUT CIRCUIT (50 OHMS) OF THE HF TRANSCEIVER. THE HF SYSTEM COMPRISES OF A TRANSCEIVER AND AN ANTENNA COUPLER AND SERVES FOR ALL LONG DISTANCE VOICE COMMUNICATIONS BETWEEN DIFFERENT AIRCRAFT (IN FLIGHT OR ON THE GROUND) OR BETWEEN THE AIRCRAFT AND GROUND STATIONS. IT OPERATES ON THE FREQUENCY RANGE DEFINED BY ARINC 719 (2.8 TO 23.999 MHz)) WITH 1 KHz SPACING BETWEEN CHANNELS. THE COUPLER IS A PRESSURISED SEALED BOX WITH CONNECTORS AND PRESSURISING VALVE.

CLASSIFICATION HAS BEEN DETERMINED IN ACCORDANCE WITH THE FOLLOWING:- GENERAL INTERPRETATIVE RULES (GIR)S GIR 1 HAS BEEN USED TO CLASSIFY THIS PRODUCT BY THE TERMS OF HEADING 8517 - TELEPHONE SETS, INCLUDING TELEPHONES FOR CELLULAR NETWORKS OR FOR OTHER WIRELESS NETWORKS; OTHER APPARATUS FOR THE TRANSMISSION OR RECEPTION OF VOICE, IMAGES OR OTHER DATA, INCLUDING APPARATUS FOR COMMUNICATION IN A WIRED OR WIRELESS NETWORK (SUCH AS A LOCAL OR WIDE AREA NETWORK), OTHER THAN TRANSMISSION OR RECEPTION APPARATUS OF HEADING 8443, 8525, 8527 OR 8528 GIR 6 HAS BEEN USED TO CLASSIFY THE GOODS TO SUBHEADING LEVEL 8517 70 - PARTS CN CODE 851770 90 OTHER THAN AERIALS AND AERIAL REFLECTORS OF ALL KINDS;PARTS SUITABLE FOR USE THEREWITH ALSO CLASSIFIED IN ACCORDANCE WITH:- NOTE 2 (B) TO SECTION XVI HARMONIZED SYSTEM EXPLANATORY NOTES (HSEN) (F) TO HEADING 8517