Antenna Connection; Grounding - Icom IC-R8500 Instruction Manual

2
CONNECTIONS

■ Antenna connection

Antennas play a very important role in receiver
operation. Connecting a poor quality antenna to the
IC-R8500 will result in less than optimum performance.
The IC-R8500 requires at least 2 antennas for full
frequency coverage: one for 0.1 to 30 MHz and one
for 30 to 2000 MHz.
D Using a long wire antenna for HF bands
The IC-R8500 has a 500 Ω phono (RCA) antenna
connector for the HF bands. When using a long wire
antenna, instead of a 50 Ω matched antenna, use
one as long as possible (at least 10 m, 33 ft) and
select the active connector as follows:
q Push [SLEEP/
mode.
w Rotate the [M-CH] selector to select the "HF
ANT" item.
e Rotate the main dial to select the antenna connector.
r Push [SLEEP/
mode.
500
TYPE-N CONNECTOR INSTALLATION EXAMPLE
Nut Rubber gasket
q
Washer
w
Center conductor
(10 mm ≅
3 / in)
8
PL-259 CONNECTOR INSTALLATION EXAMPLE
q
Coupling ring
w
(10 mm ≅
3 / in)
8
9
] for 1 sec. to enter quick set
] momentarily to exit quick set
HF ANT
15 mm Slide the nut, washer,
rubber gasket
clamp over
Clamp
coaxial cable, then cut
the end of the cable
evenly.
3 mm 6 mm
Strip the cable and
fold the braid back
over the clamp.
Slide the coupling ring
30 mm
down. Strip the cable
jacket and soft solder.
10 mm (soft solder)
Strip the cable as
10 mm Soft
solder
shown at left. Soft
solder the
conductor.
1–2 mm

■ Grounding

RWARNING!
cal conduit pipe for grounding.
To prevent accidents involving electricity and interfer-
ence from transceivers, ground the receiver through
the [GND] terminal on the rear panel.
For best results, connect a heavy gauge cable to a
water pipe or long, earth-sunk copper rod. Make the
distance between the [GND] terminal and ground as
short as possible.
e
and
the
r
Plug body
e
r
center
NEVER use a gas pipe or electri-
Soft solder the center
Solder hole
conductor. Install
center conductor pin and
solder it.
No space
Carefully slide the plug
body into place aligning
the center conductor pin
on the cable. Tighten the
nut onto the plug body.
• Be sure the
conductor is the same
height as the plug body.
Slide the connector
solder solder
body on and solder it.
Screw the coupling ring
onto the connector body.
the
center