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
stationWWV,WWVH,orotherstandardfrequency
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.
•WhenreceivingWWVorWWVH(at15.00000MHz)as
a standard frequency, set the operating frequency for
14.99900 MHz.
•Otherstandardfrequenciescanbeused.
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
•Zerobeatmeansthattwosignalsareexactlythesame
frequency, resulting in a single tone being emitted.
!3 Turn the calibration marker OFF in Others set
mode.
!4 Push
EXIT/SET
twicetoexitsetmode.
Main dial
F-2F-1
ACC
F-5
OTHERS
EXIT/SET
F-7
SET
/
∫ √
13
MAINTENANCE
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