Yaesu FT-450D Operation Manual

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Page 49FT-450D OPERATION MANUALCW S POTTING (ZERO -B EATING)“Spotting” (zeroing in on another CW station) is a handy technique for ensuring that you and the other station areprecisely on the same frequency.CW M ODE O PERATIONTO USE CW SPOTTING:In CW mode, while pressing and holding the[IPO/ATT] button, the Spot tone will be heard and Spottone frequency will show in the display. This tone cor-responds to the pitch of your transmitted signal, andif you adjust the receiver frequency to match the pitchof the received CW signal to that of the Spot tone,your transmitted signal will be precisely matched tothat of the other station.Release the [IPO/ATT] button to turn the Spot tone off.USING CW R EVERSEIf you experience a difficult interference situation, where an interfering station cannot readily be eliminated, youmay wish to try receiving using the opposite sideband. This may throw the interfering station’s frequency in adirection that may lend itself more readily to rejection.1. To start, let’s use a typical example where youhave set the CW mode (using the default “USB”injection: the “ ” and “ ” icon appear).2. Press and hold in the [MODE] or [MODE]button for one second. The “ ” icon appearsinstead of “ ”, indicating that the “LSB” injec-tion side has now been selected.3. Press and hold in the [MODE] or [MODE]button, once again, for one second to return tothe normal (USB) injection side and cancel CWReverse operation (the “ ” and “ ” iconsappear).[IPO/ATT] buttonIn the illustration, Figure A demonstrates thenormal CW injection setup, using the USBside. In Figure B, CW Reverse has been en-gaged, so as to receive using LSB-side in-jection to eliminate interference.The beneficial effect of switching sidebandscan clearly be seen in this example.RX PassbandRX PassbandCarrierCarrierQRMQRMNormal CW( )CW Reverse( )USBLSBAB[MODE]/[MODE] button