XIEGU X1M Pro User Manual - page 9
9
same firmware version as previously (if the firmware update did not work, or the versions are the
same), or a newer firmware version indicating build time and date etc.
Alignment Procedure
If you find that the radio sounds “muffled” on either USB or LSB, you likely do not have the radio
aligned correctly. This is a simple procedure.
1. Set the IF OFFSET first, or you'll chase your tail. With the radio hooked to an antenna
receiving noise but no signal, adjust the IF OFFSET setting until you can switch back and
forth between USB and LSB modes and the "wooshing"; or "timbre" sounds about the
same. Looking at the audio signal with a program like Spectran is helpful. Save the
setting. The IF OFFSET is the adjustment you need to make in a dual conversion
receiver's conversion process so as to center the signal up in the final IF filters.
2. Now, adjust USB by moving USB BFO until a voice USB signal received from a local
accurate receiver is correct. Save the setting.
3. Adjust LSB by moving LSB BFO until a voice LSB signal received from a local accurate
receiver is correct. Save the setting.
4. Adjust CW only after you do the IF OFFSET, USB BFO, and LSB BFO settings. Once
you have USB/LSB set to your liking, CW setup is easy. Simply set the CW BFO (Menu
Item #4) = to your IF OFFSET value. Go to Menu item #5 and set the CW Tone to the
tone you like to listen to when copying the station you are working. Typically the value will
be between 500Hz and 800Hz. Note that this value effects only the receive frequency.
Save your changes by pressing the SYS key again, select “Yes,” and confirm your choices by
pressing the frequency select knob.
One final word is necessary and must be heeded if you are to be zero beat with the station you
are working. Because of the way the IF and SSB filter are currently set up in firmware, you will
hear both sides of zero beat, when tuning a station on CW. You MUST use the low side of
zero beat. If you use the high side, your CW signal will be off zero beat by two times your CW
Tone value.
Write down your settings for IF OFFSET, USB BFO, LSB BFO, and CW BFO for future reference.
If you manage to make a mess of things, you can always do a “General Reset,” and set the
system parameters back to factory values. There are other alternative strategies for alignment,
but moving the signal to the center of the IF pass band is the critical issue.