Icom IC-7700 Instruction Manual - Page 185
Frequency calibration
View all Icom IC-7700 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 185 highlights
MAINTENANCE 13 ■ 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-7700 has been thoroughly adjusted and tested at the factory before being shipped. You should not have to re-calibrate it. ∫ ACC / √ OTHERS SET EXIT/SET Main dial F-1 F-2 F-5 F-7 • Calibration marker item • REF Adjust item 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 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-func- tion screen, if necessary. t Push [SET] F-7 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 "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 [ACC] F-2 to enter accessory set mode. !1 Push [Z] F-2 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 Others set mode. !4 Push EXIT/SET twice to exit set mode. 13-5