13-5
■
Frequency calibration
(approximate)
A very accurate frequency counter is required to
calibrate the frequency of the transceiver. However,
a rough check may be performed by receiving radio
station WWV, WWVH, or other standard frequency
signals.
CAUTION:
The IC-7700 has been thoroughly
adjusted and tested at the factory before being
shipped. You should not have to re-calibrate it.
q
Push
SSB
to select USB mode.
w
Hold down
PBT-CLR
for 1 second 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 sta-
tion 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
EXIT/SET
several times to close a multi-func-
tion screen, if necessary.
• Calibration marker item
t
Push [SET]
F-7
to select set mode menu screen.
y
Push [OTHERS]
F-5
to enter Others set mode.
u
Push [
Y
]
F-1
several times to select the “Calibra-
tion Marker” item.
i
Rotate the main dial clockwise to turn the calibra-
tion marker ON.
o
Push
EXIT/SET
once to return to set mode menu
screen.
!0
Push [ACC]
F-2
to enter accessory set mode.
!1
Push [
Z
]
F-2
several times to select the “REF
Adjust” 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
EXIT/SET
twice to exit set mode.
Main dial
F-2
F-1
ACC
F-5
OTHERS
EXIT/SET
F-7
SET
/
∫
√
13
MAINTENANCE
