Icom AH-4 Manual

Icom Radio AH-4

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1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003 Japan A-8295H-1EX- Printed in Japanw

Tuning is required for each frequency. Be sure to retune

the antenna before transmitting when you change the fre-

quency— even slightly.

(eg. IC-7000)

Set the desired frequency in an amateur band. q

 •The AH-4 will not operate on frequencies outside of ham

bands.

Hold down [TUNER/CALL] for 1 seconds. w

 •“ ” indicator appears while tuning.

Hold down [TUNER/CALL] for 1 second.

“ e ” indicator stays ON when tuning is complete.

 •Whentheantennacannotbetuned,“ ” indicator blinks,

and the AH-4 is bypassed and the antenna is directly connected

to the antenna connector on the transceiver.

To manually bypass the AH-4, push [TUNER/CALL]. r

OPERATION

Specifications D

•Frequencyrange :3.5–54MHz(withanantennalonger

than 7 m; 23 ft)

7–54MHz(withtheAH-2b)

•Maximuminputpower :120W

•Inputimpedance :50Ω

•Tuningpowerrequired :5to15watts

•Ratedvoltage  :13.8VDC±15%

(current less than 1 A)

•Usabletemperaturerange :–10°Cto+60°C(+14°Fto+140°F)

•VSWR  :2.0:1orless(exceptantennasa

one half wave or multiple of a one

half wave in length)

•Weight(approximately) :1.2kg(2.65lb)

•Dimensions  :172(W) 69.5(H) 230(D)mm× ×

(projectionsnotincluded)  ;6.8(W) 9.1(D)inches× × 2.7(H)

All specifications are subject to change without notice or obligation.

Options D

•OPC-420 shielded control cable

ShieldedcontrolcablehelpsprotectthetransceiverfromRFfeed-

backandextendsseparationbetweentunerandtransceiverupto

10 m. (cable length 10 m; 32.8 ft)

•AH-2b antenna element

A2.5mlongantennaelementformobileoperationwithAH-4.Fre-

quencycoverage:7–54MHzwiththeAH-4.

SPECIFICATIONS AND OPTIONS

U-bolts q ………………………………………………………2

U-bolt brackets w ……………………………………………2

Flatwashers(M6large) e ……………………………………8

Flatwashers(M6small) r ……………………………………4

Springwashers(M6) t ………………………………………8

Nuts(M6) y ……………………………………………………8

Hexheadbolts(M6 u× 50) …………………………………4

Self-tappingscrews(A06 i× 30) …………………………4

PL-259 connectors o …………………………………………2

!0Weatherproofcap …………………………………………1

!1Rubbervulcanizingtape …………………………………1

Controlcable*(5m;16.4ft) …………………………………1

Coaxialcable*(5D-2V:5m;16.4ft) …………………………1

*Not shown in the illustration to the left.

INSTRUCTIONS

HF+50MHzAUTOMATICANTENNATUNER

AH-4

Thank you for purchasing the AH-4 HF + 50 MHz AU-

TOMATIC ANTENNA TUNER. The AH-4 matches your

transceiver to an antenna more than 7 m/23 ft long (3.5–

54MHz),ortheoptionalAH-2b(7–54MHz).

Please read these instructions thoroughly before installing

and operating the AH-4.

RNEVER operate this tuner without a solid ground. Always

connect the ground wire to the ground terminal. DO NOT use

the mounting plate as a ground terminal.

NEVERtransmitortunewithoutanantennaconnected.Fail-

ure to use an antenna will damage the tuner.

RHIGH VOLTAGE! NEVER touch the antenna while trans-

mitting or tuning. Place the antenna in a position where you

are sure it will not be touched.

DANGER!

WIDE TUNING RANGE ❍

 TheAH-4providesreliablematching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

AUTOMATIC DIGITAL CONTROL TUNING ❍

 Thebuilt-in8-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 auto-

maticallymemorized.Onceafrequencyismemorized,theAH-4

tunes on that frequency in less than 1 second. Note that the AH-4

doesnotmemorizeafrequencywhichisnormallytunedwithin2.5

seconds.Memoriesareretainedonlywhenthepowerison.

WEATHERPROOF DESIGN ❍

The AH-4’s tightly sealed plastic case allows convenient mount-

ing virtually anywhere. The AH-4 can be mounted outdoors under

your antenna.

0.3 W RADIATED POWER ❍

 Radiatedpowerduringtuningislessthan0.3W,minimizinginter-

ference to other stations.

✍ NOTE:

 TheAH-4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

3.5–30MHzrange.

FEATURES

SUPPLIED ACCESSORIES

Ground terminal

Mounting plate

o !0

CALCULATION OF UNDESIRABLE ANTENNA LENGTHS

Length of

half wave (½ )λ=300 ×1

Operatingfrequency(MHz) 2

[EXAMPLE]Antenna lengths to avoid when operating at 29.00

MHz

Multiple

of ½ λ=300 ×1×(1, 2, 3…) = 5.2, 10.3, 15.5 m

29 2

Fig.6 MOUNTING EXAMPLES

AH-2b+longwire

AH-2b

antenna element kit (op-

tional)

Long wire

Produkt Specifikationer

Mærke:	Icom
Kategori:	Radio
Model:	AH-4

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