microHAM SMORF Manual page 36

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Bottom line:
If you are going to measure just one signal, use IN1 or IN3 input on the SMΩRF. If measured level is below the
frequency lock level (-35dBm), rise amplitude first until it locks.
If you are going to measure two signals of the same frequency, use IN1/IN2 or IN3/IN4 input pairs. If
measured level is below the frequency lock level, rise amplitude of the signal going to IN1 or IN3 input first, until
it locks. For a phase reference you can set any one of used input.
If you are going to measure two signals of different frequency, use only IN1/IN3 inputs. If measured level is
below the frequency lock level, rise amplitude of each signal separately until it locks. Phase measurement is
principally not possible (different frequencies).
If you are going to measure three or four signals of the same frequency, you can use any inputs. If measured
level is below the frequency lock level, rise amplitude of the signal going to IN1 and IN3 inputs first until they
lock. For a phase reference you can set any input.
4IN screen has a special SCREEN MENU item – 50WPM synchronization detection. When this function is
enabled, SMΩRF tries to find a string of 50WPM dots in the input signal. It is useful for low level measurement
on antennas to recognize keyed signal from the noise or unwanted signals coming to the input. When such
signal is detected, the Syn icon on the display is lit.
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