Antenna Connection - Icom i9100 Instruction Manual

2
INSTALLATION AND CONNECTIONS

■ Antenna connection

For radio communications, the antenna is of critical
importance, along with output power and receiver sen-
sitivity. Select a well-matched 50
axial cable feedline. We recommend 1.5:1 or better of
Voltage Standing Wave Ratio (VSWR) on your operat-
ing bands. The transmission line should be a coaxial
cable.
When using a single antenna (for the HF/50 MHz
band), use the [ANT1] connector.
CAUTION: Protect your transceiver from lightning
by using a lightning arrestor.
PL-259 CONNECTOR INSTALLATION EXAMPLE
q
Coupling ring
w
e
r
30 mm (1.18 in) 10 mm (0.39 in) 1–2 mm (0.04–0.08 in)
23
ø
antenna and co-
30 mm
Slide the coupling ring
down. Strip the cable
jacket and tin the shield.
10 mm (tin here)
10 mm
Strip the cable as
tin
shown at left. Tin the
center conductor.
1–2 mm
solder solder
Slide the connector
body on and solder it.
Screw the coupling
ring onto the connec-
tor body.
Antenna SWR
Each antenna is tuned for a specified frequency
range and the SWR usually increases outside the
range. When the SWR is higher than approximately
2.0:1, the transceiver automatically reduces the TX
power to protect the final transistors. In that case, an
antenna tuner is useful to match the transceiver and
antenna. Low SWR allows full power for transmit-
ting. The IC-9100 has an SWR meter to continuously
monitor the antenna SWR.
TYPE-N CONNECTOR INSTALLATION EXAMPLE
Nut Rubber gasket
q
15 mm
Washer
w
Center
Clamp
conductor
3 mm
6 mm
e
Solder hole
No space
r
Be sure the center conductor is
the same height as the plug body.
15 mm (0.59 in) 3 mm (0.12 in) 6 mm (0.24 in)
Slide the nut, rubber
gasket and clamp
over the coaxial cable,
then cut the end of the
cable evenly.
Strip the cable and
fold the braid back
over the clamp.
Tin the center con-
ductor. Install the
center conductor pin
and solder it.
Carefully slide the
plug body into place
aligning the center
conductor pin on the
cable. Tighten the nut
onto the plug body.