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13-5
■ Frequency calibration (approximate)
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-7700 has been thoroughly ad-
justed and tested at the factory before being
shipped. You should not have to re-calibrate it.
q Push to select USB mode.
w Push and hold for 1 sec. to clear the
PBT setting and make sure that the RIT/∂TX func-
tion is not activated.
e Set the frequency to the standard frequency station
minus 1 kHz.
• When receiving WWV or WWVH (at 15.00000 MHz) as
a standard frequency, set the operating frequency for
14.99900 MHz.
• Other standard frequencies can be used.
r Push several times to close a multi-func-
tion screen, if necessary.
• Calibration marker item t Push [F-7•SET] to select set mode menu screen.
y Push [F-5•OTHERS] to enter Others set mode.
u Push [F-1•Y] several times to select the “Calibra-
tion Marker” item.
i Rotate the main dial clockwise to turn the calibra-
tion marker ON.
o Push once to return to set mode menu
screen.
!0 Push [F-2•ACC] to enter accessory set mode.
!1 Push [F-2•Z] several times to select the “REF Ad-
just” item.
!2 Rotate the main dial to adjust for a zero beat with
the received standard signal as shown at left.
• REF Adjust item
• Zero beat means that two signals are exactly the same
frequency, resulting in a single tone being emitted.
!3 Turn the calibration marker OFF in Others set
mode.
!4 Push twice to exit set mode.
EXIT/SET
EXIT/SET
EXIT/SET
PBT-CLR
SSB
Main dial
F-2F-1
ACC
F-5
OTHERS
EXIT/SET
F-7
SET
/
∫ √
13
MAINTENANCE