ICOM - AH-4 User manual
Contents
1. except antennas a half wave or multiple of a half wave in length e Weight 1 2 kg 2 65 Ib e Dimensions 172 W x 69 5 H x 230 D mm 62542 W x 69 4 H x 9 6 D in All specifications are subject to change without notice or obligation OPTIONS e OPC 420 SHIELDED CONTROL CABLE cable length 10 m Shielded control cable helps protect the transceiver from RF feedback and extends separation between tuner and transceiver up to 10 m e AH 2b ANTENNA ELEMENT A 2 5 m long antenna element for mobile operation with AH 4 Frequency coverage 7 54 MHz with the AH 4 C The AH 4 complies with essential requirements of the Provided by 89 336 EEC directive for Electromagnetic Compatibility http www yaesu museum com This compliance is based on conformity with the ETSI specification ETS300 684 EMC product standard for Downloaded by Commercially Available Amateur Radio Equipment Amateur Radio Directory Count on us Icom Inc 6 9 16 Kamihigashi Hirano ku Osaka 547 0002 Japan A 8295G 1EX Printed in Japan Copyright 1997 by Icom Inc2. sec Memories are retained only when the power is on O WEATHERPROOF DESIGN The AH 4 s tightly sealed plastic case allows conve nient mounting virtually anywhere The AH 4 can be mounted outdoors under your antenna O 0 3 W RADIATED POWER Radiated power during tuning is less than 0 3 W minimizing interference to other stations NOTE 50 MHz tuning is possible with the IC 729 IC 706MKIl IC 746 and IC 756 the IC 706 and IC 736 can only be tuned 3 5 30 MHz Connect a 50 MHz antenna connector for 50 MHz operation Provided by http www yaesu museum com Downloaded by Amateur Radio Directory SUPPLIED ACCESSORIES DOMES eserse E veeteeoease 2 2 U bolt plates oe eececeecsseeeesseecesseeeeesseeeeeeseeeeeens 2 3 Flat washers M6 large nccc 8 4 Flat washers M6 small o n 4 Spring washers M6 cissicxteccdsavtnnsectracvedicesinnenes 8 Nuts MG ccsccccccsccsecsecsscssecsessessecsesssessecsesseseesvene 8 7 Hex head bolts M6 x 50 ccccccesccesseesseeseeeseeens 4 Self tapping screws AO 6 X 30 neceser 4 9 PL 259 connectors sseciccseeceeeserrrrerrrrrereereere 2 Weatherproof Cap ccccccccccecesseesesseesesseeeseesneess 1 1 Control cable OPC 136 5 M ccccsesssseseeeeeees 1 2 Coaxial cable 5D 2V x 5 M oo eeeeeesesseeeesteeeeeees 1 INSTALLATION NOTE After inserting the coaxial cable into the AH 4 top cover solder the PL 259 connector to the coaxial cab
3. O jefe INSTRUCTIONS HF 50 MHz AUTOMATIC ANTENNA TUNER AH 4 Thank you for purchasing the AH 4 AUTOMATIC ANTENNA TUNER The AH 4 matches your trans ceiver to an antenna more than 7 m 23 ft long 3 5 MHz and above Please read these instructions thoroughly before in stalling and operating the AH 4 DANGER Ground terminal Mounting plate NEVER use this tuner when it is ungrounded Always ground the tuner through the ground terminal before operating DO NOT use the mounting plates for grounding NEVER transmit or tune without an antenna Failure to use an antenna will damage the tuner AHIGH VOLTAGE NEVER touch the antenna while transmitting or tuning Place the antenna in a position where you are sure it will not be touched FEATURES O WIDE TUNING RANGE The AH 4 provides reliable matching of frequencies from 3 5 MHz to 54 MHz when using at least a 7 m 23 ft antenna or 7 MHz to 54 MHz when using the AH 2b ANTENNA ELEMENT O AUTOMATIC DIGITAL CONTROL TUNING The built in 8 bit microprocessor chooses the lowest SWR condition from more than 1 040 000 different LC coil capacitor combinations O 45 FREQUENCY MEMORIES FOR FAST TUNING The LC combinations of 45 previously used frequen cies are automatically memorized in the AH 4 Once a frequency is memorized the AH 4 tunes on that frequency in less than 1 sec Note that the AH 4 does not memorize a frequency which is normally tuned within 2 5
4. le Remove the top cover Fig 1 Install the control cable and coaxial cable Fig 1 Connect and solder the PL 259 connector to the coaxial cable Fig 4 Fig 1 COVER REMOVAL AND CABLE INSTALLATION Strain relief insert Control Y Da Fig 2 CABLE CONNECTIONS ex IC 706MKII Coaxial cable IC 706MKII rear panel ey rn Z NOTE For the IC 756 and IC 746 connect to ANT 1 Fig 3 GROUND CONNECTIONS The transceiver and antenna tuner must have an ade quate ground connection Otherwise the overall ef fency of the transceiver and antenna tuner installation will be reduced Interference RF feed back and elec trical shocks from other equipment could also occur For best results use the heaviest gauge wire or strap available and make the connection as short as possi ble see right e A long wire connected to the GND terminal as a counter poise is also acceptable Connect the control cable to the AH 4 Fig 2 Connect the GND cable to the AH 4 Fig 3 Replace the top cover Mount the AH 4 in the desired location on an an tenna pole in your vehicle s trunk etc Fig 5 Connect an antenna to the AH 4 Fig 6 Connect the control cable and the coaxial cable to the transceiver Remove 8 screws from the top cover and remove the cover Loosen the screws on both cable clamps If de sired install a strain relief insert Supplied corre sponding to
5. r Flat washer LLL LL AL LAL LAL Weatherproof cap Drill a hole here diameter 6 6 7 mm AH 2b long wire Osha ye i ty oe ae Abo gil ee gt y A Ne ao A wy OPERATION To ensure the correct impedance match tune the an tenna with the AH 4 each time the operating frequency is changed Set the desired amateur band and frequency of the e The TUNER light flashes and CW appears while tun transceiver i The TUNER light lights constantly when tuning is complete e When the connected wire cannot be tuned the TUNER light goes out the AH 4 is bypassed and the antenna wire is connected to the antenna connector on the trans ceiver directly Push TUNER for 2 sec To bypass the AH 4 manually push TUNER CALCULATION OF UNDESIRABLE ANTENNA LENGTHS EXAMPLE Antenna lengths to avoid when operat Length of 300 EA ing at 29 00 MHz 800 PT half wave operating frequency MHz 9 Multiple _ 300 1 E aoa Dg DX D 2 3 5 2 10 3 15 5m SPECIFICATIONS e Frequency range 3 5 54 MHz with an antenna longer than 7 m 23 ft 7 54 MHz with the AH 2b e Maximum input power 120 W e Input impedance 750 Q e Tuning power required 10 W 5 15 W e Rated voltage 13 8 V DC 15 current drain less than 1 A e Usable temperature range 10 C to 60 C 4 14 F to 140 F e VSWR 2 0 1 or less
6. the diameter of the cable Install the coaxial cable through the top cover cable clamp Install the control cable through the bottom cover cable clamp After connecting the coaxial cable and control ca bles tighten the cable clamp screws Antenna element AH 2b optional black ie red DC13 PL 259 white START connector a green KEY 7 F Bottom cover Control cable e Ground example To AH 4 GND terminal Copper screen Copper pipe Metal object Fig 4 PL 259 CONNECTOR SOLDERING 30 mm i and Coupling ring 10 mm soft solder 10mm Soft k solder Cs 1 2 mm solder solder o E 10 mm in Fig 5 MOUNTING THE AH 4 e Mounting on an antenna pole Using the supplied U bolts Fig 6 MOUNTING EXAMPLES AH 2b ANTENNA ELEMENT KIT optional Slide the coupling ring over the coaxial cable Strip the cable jacket and pull it down to reveal 10 mm 0 4 in of braid e Soft solder the exposed braid and then pull the jacket back in place Strip the cable as shown at left Tin the center con ductor the entire length of the exposed braid Slide the connector body over the cable and sol der as shown at left Screw the coupling ring onto to the connector body e Mounting on a flat location Using self tapping screws Using nuts and bolts Nut mm Spring washe
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