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When using a precise oscillator (10 MHz) and an analog oscilloscope,
1. Press and hold SW1 and enter "Setting" from the "function selection menu".
2. Observe the terminal on the side close to the board end of CN2 on the
SDR-3A board and the output of the oscillator (10 MHz) with an analog
oscilloscope. Trigger with either signal.
3. While "1. Freq Adj" is selected, rotate RE2 so that the two waveforms can
be synchronized as much as possible (move slowly to the left or right as
much as possible) with the analog oscilloscope.
Although it may be only my digital oscilloscope, if I use a digital
oscilloscope, it may seem to be synchronized even with the wrong
adjustment value, so digital oscilloscope is not recommended.
4. Press and hold SW1 to return to the "function selection menu" screen and
the setting is written to Flash.
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. Frequency adjustment 3
