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On Mon, Jun 1, 2020 at 10:28 AM, Rudolf Schaffer wrote:

I tried the "0" span solution but nanovna-saver refused a null value for the span.
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Rudy,
Another solution is to use PuTTY or other terminal program to control the CW frequency of the NanoVNA:


ch> sweep center 50000000
ch> sweep span 0
ch> sweep center 75000000
ch> sweep center 100000000

1. Above I've used PuTTY to set the NanoVNA center frequency to 50 MHz, and the span to 0 Hz to put the NanoVNA in CW mode.
2. Once in CW Mode you can use "sweep center <frequency in Hz)" to change subsequent CW frequencies (75 and 100 MHz above).

If your terminal program has scripting, then you can automate setting the CW mode and sweeping frequencies.

- Herb