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13
MAINTENANCE
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■
Frequency calibration
(approximate)
[PBT-CLR]
[
AF
] [
RF/SQL
]
[
∂TX
]
[
RIT
]
[
MENU
] [
SSB
]
[P.AMP÷ATT]
[
√
]
[
∫
]
[DIAL]
Ù
47
Ú
O F F
SET
C a l i b r a t i o n M a r k e r
Ù
48
Ú
5 0 %
SET
R E F A d j u s t
• Calibration marker item
• REF Adjust item
A very accurate frequency counter is required to cali-
brate the frequency of the transceiver. However, a
rough check may be performed by receiving radio sta-
tion WWV, WWVH, or other standard frequency sig-
nals.
CAUTION:
The IC-7410 has been thoroughly ad-
justed and tested at the factory before being
shipped. You should not have to re-calibrate it.
q
Push [SSB] once or twice to select the USB mode.
w
Push [PBT-CLR] for 1 second to clear the PBT set-
tings and make sure that the RIT/
∂
TX function is
turned OFF.
e
Set the frequency to the standard frequency station
minus 1 kHz.
•
When receiving WWV or WWVH (at 15.000.00 MHz) as
a standard frequency, set the operating frequency for
14.999.00 MHz.
• Other standard frequencies can also be used.
r
Hold down [MENU] for 1 second to enter the Set
mode.
t
Push [
Y
](F-1) or [
Z
](F-2) to select “Calibration
Marker.”
y
Rotate [DIAL] to turn ON the calibration marker.
• A sidetone may be heard.
u
Push [
Z
](F-2) to select “REF Adjust.”
i
Rotate [DIAL] to adjust for a zero beat with the re-
ceived standard signal.
• Zero beat means that two signals are exactly the same
frequency, resulting in a single tone being heard.
o
Push [
Y
](F-1) to select “Calibration Marker.”
!0
Rotate [DIAL] to turn OFF the calibration marker.
!1
Push [MENU] to save, and exit the Set mode.
The IC-7410 2-step protection function monitors the
power amplifier temperature and activates when the
temperature becomes extremely high.
• Reduced power transmission
Halves the transmit output power.
“LMT” appears above the TX icon “
.” (p. 11)
• Transmission inhibit
Deactivates the transmitter.
Even if you push [PTT] or [TRANSMIT], the TX indica-
tor does not light.
When the protector is activated, operate in only the
stand-by or receive mode until the power amplifier
cools down.
NOTE: DO NOT
turn OFF the transceiver power
when the protector is ON, or the cooling fan will not
function, and delay cooling the transceiver.
■
About protection displays
