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Icom AT-140 [4/12] Antenna system
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1
ANTENNA SYSTEM
■ Antenna for ship
Required antenna element length
Required antenna element length to achieve full per-
formance varies according to the lowest frequency:
The longer the antenna element, the better the an-
tenna efficiency.
Undesirable antenna element lengths
AVOID
multiples of
1
⁄2λ (half wavelength) for an-
tenna element lengths, since tuning becomes difficult.
L : Antenna element length to be avoided [m]
f : Operating frequency [MHz]
n : Natural number (n = 1, 2, 3, ...)
[Example]
At an operating frequency of 16 MHz, avoid the fol-
lowing antenna element lengths:
For example, if 15 m is selected for an antenna ele-
ment length, you have no problem in the 1.6–25 MHz
marine bands range.
NOTE: Keep antennas as far away from other objects
as possible, especially metal objects.
Insulator
Backstay operates as
a long-wire antenna.
Insulator
Whip antenna
L =
300
16
×
1
2
n
×
9.4, 18.8, ...
1 m
39 inches
L =
300
f
×
1
2
n
×
The lowest frequency Required antenna element length
1.6 MHz band 7 m; 23.0 feet or longer
4 MHz band 3 m; 9.8 feet or longer
■ Antenna for land operation
In some countries, HF transceivers can be used for
land mobile operation. Ask your Icom Dealer for de-
tails, since the radio law varies according to each
country.
For land mobile operation on 4 MHz and above, an
optional AH-2b ANTENNA ELEMENT is available.
The AH-2b includes a sturdy tow hook mount system
for holding a 2.5 m; 8.2 feet stainless steel antenna
element plus all the necessary hardware.
Refer to the AH-2b instruction manual for the AH-2b
and AT-140 installation to your vehicle. Ask your Icom
Dealer for details.
Connect a suitable antenna element for a base sta-
tion. To achieve full performance, refer to “Required
antenna element length” above.
AH-2b
Содержание
- At 140 1
- Instruction manual 1
- At 140 hf auto matic antenna tune 2
- Explicit definitions 2
- Foreword 2
- Important 2
- Precautions 2
- R danger high voltage neve 2
- Read all instruction 2
- Save this instruction manual 2
- Supplied accessories 2
- Features 3
- Miscellaneous items 3
- Table of contents 3
- Antenna system 4
- I antenna for land operation 4
- I antenna for ship 4
- Required antenna element length 4
- Undesirable antenna element lengths avoi 4
- Counterpoise 5
- Danger neve 5
- Electrolysis 5
- Good ground points 5
- Ground cable 5
- I coaxial cable 5
- I ground and counterpoise 5
- Ideal ground points 5
- Important 5
- R warning 5
- Undesirable ground points avoi 5
- Why a ship s ground is required 5
- Between the at 140 and hf marine transceiver con nect 4 control signal lines as shown below to prevent rf feedback use a 4 conductor shielded cable con nect the shield line to the gnd terminal on the trans ceiver icom offers 10 m 32 ft long optional control cables as at right 6
- D when connecting to icom ic m700 ty ic 78 6
- D when connecting to icom ic m710 rt ic m700pro 6
- D when connecting to icom ic m802 6
- E mount the at 140 in the desired location 6
- I control cable 6
- I installation outline 6
- Installations 6
- Opc 566 for ic m710 rt m700pro opc 1147 for ic m802 6
- Q connect a control cable and 4 conductor shielded cable 6
- R connect the control cable and the coaxial between the transceiver and the at 140 6
- Refer to p 6 terminal information for details 6
- T connect an antenna ship s ground or counter poise 6
- W connect and solder the pl 259 connector to the coaxial cable 6
- Attach the at 140 either horizontally or vertically with one of the water drains facing downwards after mounting remove the screw in the water drain 7
- E slide the connector body over the cable and sol der as shown below 7
- I mounting 7
- I pl 259 connector 7
- Installations 7
- Mount the at 140 securely with the supplied nuts and bolts otherwise vibrations and shocks due to waves etc could loosen the antenna tuner making if fall causing personal injury 7
- Mounting on a mast metal pole 7
- Mounting on a flat surface 7
- Q slide the coupling ring over the coaxial cable strip the cable jacket and pull back to reveal 10 mm of braid 7
- R screw the coupling ring onto the connector body 7
- W strip the cable as shown below soft solder the cen ter conductor the entire length of the exposed braid 7
- Warning 7
- I cable connections 8
- Important at 140 8
- Control cable signals 9
- I terminal information 9
- Key voltage key 9
- Start voltage star 9
- I transceiver setting 10
- I specifications 11
- I unit description 11
- Unit description and specifications 11
- 1 32 kamiminami hirano ku osaka 547 0003 japan 12
- A 6175h 1ex printed in japan 2002 icom inc 12
- Asia icom inc 12
- Beijing icom ltd 12
- Icom america inc 12
- Icom australia pty ltd 12
- Icom canada 12
- Icom europe gmbh 12
- Icom france s a 12
- Icom new zealand 12
- Icom spain s l 12
- Icom uk ltd 12
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