I Frequency Calibration (Approximate) - Icom IC-7800 Instruction Manual

I Frequency calibration
[F-1•Y] [F-2•ACC]/[F-2•Z]
[F-5•OTHERS]
• Calibration marker item
• REF Adjust item
(approximate)
[F-7•SET]
[EXIT/SET] Main dial
A very accurate frequency counter is required to cali-
brate the frequency of the transceiver. However, a
rough check may be performed by receiving radio sta-
tion WWV, WWVH, or other standard frequency sig-
nals.
CAUTION: The IC-7800 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 [PBT CLEAR] for 1 sec. to clear the PBT set-
ting and make sure that the RIT/∂TX function 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 [F-7•SET] to select set mode menu screen.
y Push [F-5•OTHERS] to enter miscellaneous (oth-
ers) set mode.
u Push [F-1•Y] 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 [F-2•ACC] to enter accessory set mode.
!1 Push [F-2•Z] several times to select the "REF Ad-
just" 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 miscellaneous
(others) set mode.
!4 Push [EXIT/SET] twice to exit set mode.
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MAINTENANCE