Icom IC-7800 - Frequency Calibration (Approximate)

13-5
■ Frequency calibration (approximate)
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 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.
[F-1•Y] [F-2•ACC]/[F-2•Z]
[F-5•OTHERS]
[EXIT/SET] Main dial
[F-7•SET]
q Push [SSB] to select USB mode.
w Hold down [PBT CLEAR] 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 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.
• Calibration marker item tPush[F-7•SET]toselectsetmodemenuscreen.
yPush[F-5•OTHERS]toentertheOthers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.
• REF Adjust item
  •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 the Others set
mode.
!4 Push [EXIT/SET] twice to exit set mode.
13
MAINTENANCE