![Icom AT-140 [5/12] I coaxial cable](/img/pdf.png)
Icom AT-140 [5/12] I coaxial cable
![Icom AT-140 [5/12] I coaxial cable](/views2/1074351/page5/bg5.png)
2
1
ANTENNA SYSTEM
■ Coaxial cable
Insulate the lead-in cable of the AT-140 antenna ter-
minal and antenna element from other metal objects.
To prevent interference, keep cables as far as possi-
ble from an antenna, electric pump and other elec-
tronic equipment.
To prevent erroneous indications, keep cables as far
away as possible from the flux gate compass.
Use suitable noise filters for alternators, fluorescent
lights, etc. Ask your Dealer for details.
■ Ground and counterpoise
Why a ship’s ground is required
The AT-140’s ground terminal MUST be connected
to your ship’s ground. Grounding prevents electric
shocks, interference to other equipment and other
problems. Grounding also ensures effective signal
transmission.
DANGER!NEVER connect the ground terminal to
the following points. These connections may cause
an explosion or electric shocks:
– Gas or electrical pipe
– Fuel tank or oil-catch pan
IMPORTANT! The mounting plate is NOT con-
nected to the AT-140’s internal ground.
Ideal ground points
One of following points is ideal:
– External ground plate
– External copper screen
– External copper foil
Good ground points
If electrically connected to sea water, one of the fol-
lowing points is usable:
– Stainless steel stanchion
– Through mast
– Through hull
– Metal water tank
Undesirable ground points
AVOID the following points, if possible. These con-
nections may cause noise or electrolysis:
– Engine block
– Ship’s DC battery ground
Electrolysis
All ground cables from the AT-140, HF transceiver,
etc. on your ship should be connected to only 1 ship’s
ground.
AVOID connection to 2 or more points. Voltage dif-
ference between 2 or more ship’s grounds may cause
electrolysis.
AVOID connection between dissimilar metals where
an electric current is present. These connections may
cause electrolysis.
Counterpoise
If your ship is made of FRP, etc. and a good ship’s
ground is not available, connect a counterpoise.
1
⁄4λ (quarter wavelength) radial for each band is suit-
able for a counterpoise. Install the counterpoise di-
rectly below the AT-140’s ground terminal. Insulate
the ends of each radial from other metal objects. Lay-
out the radial horizontally and as straight as possible.
L : Counterpoise length for the operating frequency [m]
f : Operating frequency [MHz]
[Example]
At an operating frequency of 16 MHz, use a counter-
poise with the following length:
Ground cable
For best results, use the heaviest gauge wire or metal
strap available. Make the distance between the AT-
140’s ground terminal and ship’s ground as short as
possible.
Supplied ground cable can be used for ground con-
nection to a through mast. Confirm that the through
mast is electrically connected to sea water.
R WARNING!— When grounding to metal hull
Use a Zinc anode to protect the hull from
electroly-
sis.
Ask your technical dealer, installer or refer to a tech-
nical book, etc., for RF ground details.
L =
300
16
×
1
4
4.7 [m]
1 m
39 inches
L =
300
f
×
1
4
Ground terminal
AT-140
1
⁄4λ radial for
each band
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
Похожие устройства
- Ardo TLN 106 SW Инструкция по эксплуатации
- Icom AT-180 Инструкция по эксплуатации
- Ardo TLN 106 SA Инструкция по эксплуатации
- Icom BC-137 Инструкция по эксплуатации
- PocketBook 360 Plus Grey Инструкция по эксплуатации
- Ardo TLN 106 EW Инструкция по эксплуатации
- PocketBook Pro 622 Black Инструкция по эксплуатации
- Icom BC-143 Инструкция по эксплуатации
- Ardo TLN 125 LW Инструкция по эксплуатации
- Wexler Book T7004 White+чехол Инструкция по эксплуатации
- Icom IC-B144 Инструкция по эксплуатации
- Ardo TLN 105 LW Инструкция по эксплуатации
- Icom BC-146 Инструкция по эксплуатации
- Apple MacBookPro MC975RS/A Инструкция по эксплуатации
- Ardo TLN 105 SW Инструкция по эксплуатации
- Apple MacBookPro MC976RS/A Инструкция по эксплуатации
- Icom HM-127 Инструкция по эксплуатации
- Ardo TLN 85 SW Инструкция по эксплуатации
- Icom IC-PW1 Инструкция по эксплуатации
- Ardo TLN 85 EW Инструкция по эксплуатации