Antenna Tuner; Tuner Operation; Manual Tuning; Tuning A Narrow Bandwidth Antenna - Icom IC-9100 Instruction Manual

13
ANTENNA TUNER OPERATION
The internal automatic antenna tuner automatically
matches the transceiver to the selected antenna. After
the tuner matches an antenna, the variable capacitor set-
tings are memorized as a preset point for each frequency
range (100 kHz steps). Therefore, when you change the
frequency range, the variable capacitors are automati-
cally preset to the memorized setting.
no antenna is connected. This will damage the trans-
ceiver. Be careful of the antenna selection.
For your convenience
When you purchase a brand-new antenna, or you
want to change the antenna settings, you can erase all
of the internal antenna tuner preset points with "Tuner
Preset Clear" in the Set mode. (p. 163)
D
Push [TUNER] to turn ON the internal antenna
tuner. The antenna is automatically tuned when the
antenna SWR is higher than 1.5:1.
D
Transmitting in SSB with a soft voice, the internal tuner
may not automatically tune correctly. In such cases,
manual tuning is helpful.
Hold down [TUNER] for 1 second to start manual
tuning.
cator (MAIN Band) lights red while tuning.
after 20 sec. of tuning, "
RX indicator (MAIN Band) goes out.
the 50 MHz band)
If the tuner still cannot reduce the SWR to less than
1.5:1 after checking the above, perform the following:
for higher frequencies in some cases.)
Even if manual tuning does not match the antenna and
the tuner turns OFF the first time, it may match the an-
tenna the second time.
159
transmit with the tuner ON when
" appears.
" blinks and the TX/RX indi-
" disappears and the TX/
and 50 MHz bands— the 144 MHz, 430 MHz and
1200 MHz* bands cannot be tuned.
NEVER transmit without an antenna properly con-
nected to each antenna port in use.
ing farther than 100 kHz from an antenna's pro-
grammed preset point, hold down [TUNER] for
1 second to start manual tuning.
AM mode. In such cases, hold down [TUNER] for
1 second to manually tune.
[TUNER]
Some antennas, especially for the low bands, have
a narrow bandwidth. These antennas may not be
tuned beyond the edge of their operating bandwidth,
therefore, manually tune such an antenna as follows:
Suppose you have an antenna which has
an SWR of 1.5:1 at 3.55 MHz and an
SWR of 3:1 at 3.8 MHz.
q Select 3.55 MHz and hold down [TUNER] for 1
second. to start manual tuning.
w Select 3.80 MHz and hold down [TUNER] for 1
second to start manual tuning.
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