Icom IC-718 - Page 64

N 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-7600 has been thoroughly ad-
justed and tested at the factory before being
shipped. You should not have to re-calibrate it.
q Push [SSB] to select USB mode.
w Push and hold [PBT-CLR] 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 [EXIT/SET] several times to close a multi-
function screen, if necessary.
t Push [SET] (F-6) 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
“Calibration 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 right.
• 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.
F-1 F-2
F-6
EXIT/SET
[DIAL]
SET
F-5
OTHERS
ACC
SSB
PBT-CLR
/
• Calibration marker item
• REF Adjust item
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MAINTENANCE