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INSTRUCTIONS

AUTOMATIC ANTENNA TUNER

Thank you for choosing this Icom product. 

READ ALL INSTRUCTIONS

 carefully and completely 

before using this product.

1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003, Japan

Jan. 2022

A7669W-1EX 

Printed in Japan

© 2022  Icom Inc.

 1 

 4 

AH-730

 

Important

SAVE THESE INSTRUCTIONS

— These instructions 

contain important operating instructions for the AH-730.

 

Precaution

 

R

DANGER! NEVER

 operate the antenna tuner without a solid 

ground. Always connect the ground wire to the ground terminal. 

DO 

NOT

 use the mounting plate as a ground terminal.

 

R

DANGER! NEVER

 transmit or tune without an antenna 

connected. Failure to use an antenna will damage the antenna tuner.

 

R

DANGER! HIGH VOLTAGE! NEVER

 touch the antenna while 

transmitting or tuning. Place the antenna in a position where you 
are sure it will not be touched.

KEEP

 the antenna tuner away from heavy rain and never immerse 

it in water. The antenna tuner meets IPX4 requirements for splash 
resistance. However, once the antenna tuner has been dropped, splash 
resistance cannot be guaranteed due to the fact that the antenna tuner 
may be cracked or the waterproof seal damaged, and so on.

Ground terminal

Mounting plate

 

Features

 

Wide tuning range

 

The AH-730 provides reliable matching from 1.8 MHz to 
54 MHz when using at least a 7 m (23 ft) antenna or 3.5 
MHz to 54 MHz when using the AH-2b 

antenna element

.

 

Automatic digital control tuning

 

 The built-in 32 bit microprocessor chooses the lowest 
SWR using more than 1,040,000 different LC (coil/
capacitor) combinations.

 

45 frequency memories for fast tuning

 

 The LC combinations of 45 previously-used frequencies 
are automatically memorized. Once a frequency is 
memorized, the AH-730 tunes on that frequency in less 
than 1 second. Note that the AH-730 does not memorize 
a frequency which is normally tuned within 2.5 seconds. 
Memories are retained only when the power is on.

 

0.3 W radiated power

 

Radiated power during tuning is less than 0.3 W, 
minimizing interference to other stations.

 

IPX4 weatherproof design

 

The AH-730’s tightly sealed plastic case allows 
convenient mounting virtually anywhere. The AH-730 can 
be mounted outdoors under your antenna.

NOTE:

 The AH-730 can be used with most of Icom HF 

transceiver, which covers HF through 50 MHz bands.
However, the IC-706 and IC-736 can only be tuned in the 
1.8 ~ 30 MHz range.

 

FCC information

This equipment has been tested and found to comply with the limits 
for a Class B digital device, pursuant to part 15 of the FCC Rules. 
These limits are designed to provide reasonable protection against 
harmful interference in a residential installation. This equipment 
generates, uses, and can radiate radio frequency energy and, if 
not installed and used in accordance with the instructions, may 
cause harmful interference to radio communications. However, 
there is no guarantee that interference will not occur in a particular 
installation. If this equipment does cause harmful interference to 
radio or television reception, which can be determined by turning 
the equipment off and on, the user is encouraged to try to correct 
the interference by one or more of the following measures:

 

• Reorient or relocate the receiving antenna.

 

• Increase the separation between the equipment and receiver.

 

• Connect the equipment into an outlet on a circuit different 

from that to which the receiver is connected.

 

• Consult the dealer or an experienced radio/TV technician for help.

CAUTION:

 Changes or modifications to this device, not expressly 

approved by Icom Inc., could void your authority to operate this 
device under FCC regulations.

This device complies with part 15 of the FCC Rules. Operation is 
subject to the following two conditions: (1) This device may not cause 
harmful interference, and (2) this device must accept any interference 
received, Including interference that may cause undesired operation.

Icom, Icom Inc. and the Icom logo are registered trademarks of Icom Incorporated (Japan) in Japan, the United States, the 
United Kingdom, Germany, France, Spain, Russia, Australia, New Zealand, and/or other countries.

 

Specifications

 

• Frequency range: 

 1.8 ~ 54 MHz (with an antenna 
longer than 7 m, 23 ft) 
3.5 ~ 54 MHz (with the AH-2b)

 

• Maximum input power:  150 W

 

Input impedance: 

50 Ω

 

• Tuning power required:  5 ~ 15 watts

 

• Rated voltage:   

 13.8 V DC ±15%  
(current less than 0.7 A)

 

• Usable temperature range: 

 

 

 

 –10°C ~ +60°C  
(+14°F ~ +140°F)

 

• VSWR: 

 

 2.0 : 1 or less (except antennas 
a one half wave or multiple of a 
one half wave in length)

 

• Weight (approximate):  2.5 kg (5.5 lb)

 

•  Dimensions: 

 

230 (W) × 80 (H) × 340 (D) mm,

 

(projections not included)  

9.1 (W) × 3.1 (H) × 13.4 (D) inches

 

L

All stated specifications are typical and subject to change without 
notice or obligation.

 

Options

 

OPC-1465

 

shielded control cable

 

Cable length (approximate): 10 m, 32.8 ft

 

The same as supplied.

 

AH-2b

 

antenna element

  

A 2.5 m long antenna element for mobile operation with AH-730. 
Frequency coverage: 3.5 ~ 54 MHz with the AH-730.

 

Supplied accessories

U-bolts

Hex head bolts (M6 × 50)

U-bolt plates

Self-tapping screws  

(A0 6 × 30)

Flat washers (M6 large)

Weatherproof 
cap

Rubber 
vulcanizing tape

Control cable 

(Approximately 10 m, 32.8 ft  

(without ground wires))

Flat washers (M6 small)

Spring washers (M6)

Nuts (M6)

 

Installation

 

D

Mounting examples

 

R

DANGER! HIGH VOLTAGE! NEVER

 touch the antenna while transmitting or tuning. Place the antenna in a position where 

you are sure it will not be touched.

AH-2b + long wire

AH-2b

antenna element

(optional)

Long wire

Long wire

Icom is not responsible for the destruction, damage to, or 
performance of any Icom or non-Icom equipment, if the 
malfunction is because of:

 

• Force majeure, including, but not limited to, fires, 

earthquakes, storms, floods, lightning, other natural disasters, 
disturbances, riots, war, or radioactive contamination.

 

• The use of Icom antenna tuners with any equipment 

that is not manufactured or approved by Icom.

 

Operation

Tuning is required for each frequency. Be sure to retune 
the antenna before transmitting when you change the 
frequency— even slightly.

Example: IC-7300

1.  Turn ON the transceiver.

 

• Each time you push 

TUNER

, “TUNE” is displayed or goes 

out, and the AH-730 is turned ON or OFF (bypassed).

2.  Hold down 

TUNER

 for 1 second to start manual tuning.

 

• The antenna tuner reduces the SWR to less than 2:1 after 2 ~ 

3 seconds of tuning.
 

L

While tuning, “TUNE” blinks red.

 

L

 If the antenna tuner cannot reduce the SWR to less than 2:1 
after 15 seconds of tuning, “TUNE” goes out.

Hold down 

TUNER

 for 1 second.

3.  After tuning, “TUNE” is displayed.

 

L

 When the long wire antenna cannot be tuned, “TUNE” goes out. In 
that case, the AH-730 is bypassed and the wire is directly connected.

NOTE:

 When the wire antenna cannot be tuned, confirm wire 

length and connection. Note that the AH-730 cannot tune a 

wire that is a ½λ long or on a multiple of that frequency.

 

Explicit definitions

WORD

DEFINITION

 

R

DANGER!

Personal death, serious injury or an 
explosion may occur.

 

R

WARNING!

Personal injury, fire hazard or electric shock 
may occur.

CAUTION

Equipment damage may occur.

NOTE

If disregarded, inconvenience only. No risk 
of personal injury, fire or electric shock.

Below statement is for UKCA purpose only

United Kingdom Authorised Importer: Icom (UK) Ltd.
Address: Blacksole House, Altira Park, Herne Bay, Kent, 
CT6 6GZ, U.K.

Summary of Contents for AH-730

Page 1: ...INSTRUCTIONS AUTOMATIC ANTENNA TUNER Thank you for choosing this Icom product READ ALL INSTRUCTIONS carefully and completely before using this product AH 730 ...

Page 2: ...h covers HF through 50 MHz bands However the IC 706 and IC 736 can only be tuned in the 1 8 30 MHz range FCC information This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates use...

Page 3: ...rder and then tighten the wing nut L Make sure the base nut is tightened firmly before you tighten the wing nut as shown below L Carefully bend the wire terminal up after you tighten the wing nut 1 Antenna tuner Base nut Crimp on wire terminal Star washer Wing nut 4 Place the weatherproof cap over as much of the insulator as possible 2 L How far down it will go depends on the height of the wing nu...

Page 4: ... Flat washer S Nut R WARNING Mount the AH 730 securely with the supplied nuts and bolts Otherwise vibrations and shocks could loosen the antenna tuner making it fall causing personal injury CAUTION DO NOT mount the antenna tuner upside down Mounting on a flat location Using nuts and bolts Using self tapping screws Spring washer Flat washer L Flat washer L Flat washer S Hex head bolt Nut Coaxial ca...

Page 5: ...wire AH 2b antenna element optional Long wire Long wire Icom is not responsible for the destruction damage to or performance of any Icom or non Icom equipment if the malfunction is because of Force majeure including but not limited to fires earthquakes storms floods lightning other natural disasters disturbances riots war or radioactive contamination The use of Icom antenna tuners with any equipme...

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