averaging and i/f bandwidth selection support

[edy555]

No description provided.

[edy555]

作ってみた fb643ec
けど、測定結果に違いは見えない(S21のノイズフロアが下がらない)。
https://github.com/ttrftech/NanoVNA/tree/bandwidth

帯域幅を狭くすると、スイープにそれなりに時間がかかる。10Hzで100倍=100ms/pt

[d51r3verse]

100Hz traces more linear/quieter than 1kHz( bandwidth seems to work I think 😁 )
But, unexpected readings found bandwidthed calibration&sweeps.
Here is my experience( both ends terminated LOAD )

Cal:1kHz / Sweep:1kHz

Cal:100Hz / Sweep:100Hz

[Pmax65]

Hi to all,

what is the sweep time for the 100Hz RBW?

I don't want to "teach the cat climbing to the roof", but remember that a 100Hz filtering have a longer dwell time, if you don't reduce the sweep time according to the filter dwell time you may get just wrong measurements.

Just to say, for example: my HP8711A set to 101pts/scan with a 250Hz BW filtering, it takes a sweep time of 731ms that is about 73ms delay time between samples,

Have a great day.

Massimo