Antenna Tuner Operation - Icom IC-7410 Instruction Manual

9

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
settings are memorized as a preset point for each fre-
quency range (100 kHz steps). Therefore, when you
change the frequency range, the variable capacitors
are automatically preset to the memorized setting.
no antenna is connected. This will damage the
transceiver. 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. 87)
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
If you transmit in SSB with a soft voice, the internal
tuner may not automatically tune correctly. In such
case, manual tuning is helpful.
Hold down [TUNER] for 1 second to start manual
tuning.
lights red while tuning.
within 20 seconds of tuning, "
the TX indicator goes out.
HF bands; Less than 2.5:1 for the 50 MHz band)
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 tune the antenna and
the tuner turns OFF the first time, it may tune the an-
tenna the second time.
83
transmit with the tuner ON when
" appears.
" blinks and the TX indicator
" disappears and
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 case, 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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