Frequency Calibration (Approximate) - Icom IC-7700 Instruction Manual

■ Frequency calibration
/
∫ ACC √ OTHERS
F-1 F-2 F-5
• Calibration marker item
• REF Adjust item
(approximate)
Main dial
EXIT/SET
SET
F-7
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 to select USB mode.
SSB
w Push and hold
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
tion screen, if necessary.
t Push [SET] F-7
y Push [OTHERS]
u Push [Y]
F-1
tion Marker" item.
i Rotate the main dial clockwise to turn the calibra-
tion marker ON.
o Push
EXIT/SET
screen.
!0 Push [ACC] F-2
!1 Push [Z]
F-2
Adjust" item.
!2 Rotate the main dial to adjust for a zero beat with
the received standard signal as shown at left.
• 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
13-5
MAINTENANCE
PBT-CLR for 1 sec. to clear the
several times to close a multi-func-
to select set mode menu screen.
to enter Others set mode.
F-5
several times to select the "Calibra-
once to return to set mode menu
to enter accessory set mode.
several times to select the "REF
twice to exit set mode.
13