Frequency Calibration (Approximate) - Icom IC-7600 Instruction Manual

11
MAINTENANCE
Frequency calibration
A very accurate frequency counter is required to cal-
ibrate 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
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 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.
147
(approximate)
• Calibration marker item
• REF Adjust item
OTHERS SET
F-5 F-6
SSB
F-1 F-2 EXIT/SET
ACC /
PBT-CLR
Main dial