Icom IC-7610 Instruction Manual advanced - Page 90

REF adjustment, Calibration Marker

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11. OTHER FUNCTIONS REF adjustment You can perform a rough frequency calibration by receiving the radio station WWV, WWVH, or other frequency signals. NOTE: ••The transceiver has been adjusted and tested at the factory before being shipped out. You should not have to recalibrate. ••Before performing a frequency calibration, you have to set "Calibration Marker" to ON. ••Spurious signal waveforms may be displayed while the Calibration Marker is ON. LBefore performing a frequency calibration, set the following items as described in the table below. Operating mode USB AF RF/SQL Decent audibility AF RF/SQL Maximum RF gain TWIN PBT CLR Reset by holding down for 1 second. RIT , TX OFF (No icon) 1. Set the frequency to the standard frequency station minus 1 kHz. LIf receiving WWV or WWVH (at 15.00000 MHz) as your standard frequency, set the operating frequency to 14.99900 MHz. 2. Set "Calibration Marker" to ON. MENU » SET > Function > Calibration Marker 3. Select the "REF Adjust" item. MENU » SET > Function > REF Adjust 4. Rotate MULTI to adjust for a zero beat with the received standard signal. L"Zero beat" means that the exact same frequencies are set to 2 signals, resulting in a single tone being transmitted. 5. Set "Calibration Marker" to OFF. 6. Push EXIT several times until the MENU screen is closed. 84

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84
11. OTHER FUNCTIONS
REF adjustment
You can perform a rough frequency calibration by
receiving the radio station WWV, WWVH, or other
frequency signals.
NOTE:
• The transceiver has been adjusted and tested at
the factory before being shipped out. You should
not have to recalibrate.
• Before performing a frequency calibration, you
have to set “Calibration Marker” to ON.
• Spurious signal waveforms may be displayed while
the Calibration Marker is ON.
L
Before performing a frequency calibration, set the
following items as described in the table below.
Operating mode
USB
AF
RF/SQL
Decent audibility
AF
RF/SQL
Maximum RF gain
TWIN PBT
CLR
Reset by holding down for 1 second.
RIT
,
TX
OFF (No icon)
1.
Set the frequency to the standard frequency
station minus 1 kHz.
L
If receiving WWV or WWVH (at 15.00000 MHz) as
your standard frequency, set the operating frequency
to 14.99900 MHz.
2.
Set “Calibration Marker” to ON.
MENU
»
SET > Function >
Calibration Marker
3.
Select the “REF Adjust” item.
MENU
»
SET > Function >
REF Adjust
4. Rotate
MULTI
to adjust for a zero beat with the
received standard signal.
L
“Zero beat” means that the exact same frequencies
are set to 2 signals, resulting in a single tone being
transmitted.
5.
Set “Calibration Marker” to OFF.
6. Push
EXIT
several times until the MENU screen
is closed.