83
ANTENNA TUNER OPERATION
9
M )FTHETUNERCANNOTTUNETHEANTENNACHECKTHE
FOLLOWINGANDTRYAGAIN
sTHECORRECTANTENNACONNECTORSELECTION
sTHEANTENNACONNECTIONANDFEEDLINE
sTHEUNTUNEDANTENNA372,ESSTHANFORTHE
HF bands; Less than 2.5:1 for the 50 MHz band)
sTHETRANSMITPOWER7FORTHE(&BANDS7FOR
the 50 MHz band)
sTHEPOWERSOURCEVOLTAGECURRENTCAPACITY
If the tuner still cannot reduce the SWR to less than
1.5:1 after checking the above, perform the following:
sTRYMANUALTUNINGONEORMORETIMES
sADJUSTTHEANTENNAFEEDLINELENGTH4HISISEFFECTIVE
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.
M4UNINGANARROWBANDWIDTHANTENNA
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:
;%XAMPLE= 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.
./4%3
sNEVER transmit without an antenna properly con-
nected to each antenna port in use.
s7HEN ANTENNASARECONNECTEDSELECT THEAN-
TENNATOBEUSEDBYPUSHING;!.4s-%4%2=
s)FTHE372ISHIGHERTHANABOUTWHENTUN-
ing farther than 100 kHz from an antenna’s pro-
grammed preset point, hold down [TUNER] for
1 second to start manual tuning.
s4HEINTERNALTUNERMAYNOTBEABLETOTUNEINthe
AM mode. In such case, hold down [TUNER] for
1 second to manually tune.
[TUNER]
N!NTENNATUNEROPERATION
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.
#!54)/..%6%2 transmit with the tuner ON when
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 4UNEROPERATION
± Push [TUNER] to turn ON the internal antenna
tuner. The antenna is automatically tuned when the
antenna SWR is higher than 1.5:1.
s7HENTHETUNERIS/.h ” appears.
D-ANUALTUNING
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.
s!SIDETONESOUNDSh ” blinks and the TX indicator
lights red while tuning.
s)FTHETUNERCANNOTREDUCETHE372TOLESSTHAN
within 20 seconds of tuning, “
” disappears and
the TX indicator goes out.
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