Icom_AH-703_user.pdf
INSTRUCTIONS HF/50 MHz 5-BAND ANTENNA AH-703 Thank you for purchasing the AH-703 HF/50MHz 5- BAND ANTENNA. This antenna covers 7, 14, 21, 28 and 50 MHz bands, and is designed for portable operation of the IC-703 when carried in the LC-156. Please read these instructions thoroughly before using the AH-703. I IMPORTANT READ ALL INSTRUCTIONS carefully and completely before using the AH-703. SAVE THIS INSTRUCTION SHEET! This instruction contains important safety and operating details for the AH-703. I PRECAUTION R WARNING: HIGH VOLTAGE! NEVER touch the antenna element/wire while tuning or transmitting. This may result electrical shock or burn. R WARNING SUSPEND operation immediately or NEVER put up the antenna when thunder occurs or can be heard in the distance. R WARNING NEVER assemble or disassemble the antenna at any crowded area. A person may be in- jured. USE the AH-703 for portable operation with the IC-703 ONLY. NEVER install the antenna to a vehicle for mo- bile operation. DISCONNECT the antenna when not using the an- tenna for long period of time. DO NOT use chemical agents such as benzine or alco- hol when cleaning, as they can damage the AH-703. READ THE IC-703 INSTRUCTION MANUAL FIRST before attempting to operate the transceiver. I Supplied items I Antenna description I Antenna specifi cations Frequency coverage : 7, 14, 21, 28 and 50 MHz bands Type of antenna : 14 type whip antenna Antenna connector: PL-259 (50 : nominal) Max. input power: 20 W Total antenna length : Approx. 1,390 mm; 4.6 ft (at the longest element length) Weight: Approx. 330 g; 11.6 oz (without grounding wires) All stated specifi cations are subject to change without notice or obligation. Top element Short terminal A Short element Loading coil A Short terminal B Loading coil B Short terminal C Loading coil C Short terminal D Loading coil D Short terminal E Base element Antenna connector (PL-259 type) Base element Top elementAllen wrench Grounding wires Set screw Icom, Icom Inc. and the logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United King- dom, Germany, France, Spain, Russia and/or other countries. AH-703.qxd 03.10.2 18:02 Page 1 1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003, JapanA-6313H-1EX-qPrinted in Japan 2003 Icom Inc. I Assembling the antenna qAttach the top element to the base element, then tighten the top element. wTighten the set screw. eAttach the grounding wires to the GND terminal of the IC-703 rear panel as illustrated below. Keep the grounding wires in the LC-156 side pockets via the cable hole. Keep the separation cable on the outside of the LC-156. The above illustration is example only When SWR cannot be reduced, abnormal function- ing of the transceiver may occur, etc., change the cables (grounding, separation, DC power and micro- phone cables)wiring, as described in the “I Opera- tion hints”. I Adjusting the antenna q Set the desired operating frequency on the IC-703. w Connect the short element between the short termi- nals to suits the set operating frequency as follows. e Push TUNER on the IC-703 controller, then mea- sure the VSWR. See the IC-703 instruction manual for the VSWR mea- surement procedure. r When the VSWR is not good enough (VSWR1.5:1) or not tuned, adjust the following. Top element length: Loosen the nut of the top element, then adjust the element length as illustrated below. To improve VSWR on a higher or lower frequency in the selected frequency band, adjust the top element by lengthening or shortening it, respectively. After the element length adjustment, tighten the nut. Grounding wires: Adjust or change the wires angle, holding posi- tion, etc. t Repeat the steps e and r until the VSWR be- comes better than 1.5:1. I Operation hints K The IC-703 separation cable may work as the grounding cable (counterpoise). Changing the cable wiring may also provide better VSWR. K The quality of communication during portable oper- ation depends on the operating frequency, fi eld con- dition, etc. When the operating condition is not good, changing the place of operation may help improve operating performance. K When changing the operating frequency, manual tuning is helpful for good operation. Even changing the frequency 10 kHz, you should start with manual tuning. Loosen Adjustable Tighten ? ? ? ? ? ? ? IC-703 Separation cable controller case AH-703 Pass the grounding wire through the cable hole and keep in the side pocket. Loosen Set screw Tighten Freq.Short element Using loading coil Bandconnection 7 MHzRemove the elementAll loading coils (AD) 14 MHzDEAC 21 MHzCEAB 28 MHzBEA only 50 MHzAENo loading coil AH-703.qxd 03.10.2 18:02 Page 2
