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Forum Index : Microcontroller and PC projects : HC-12 Wireless Serial Module

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BobC
Newbie

Joined: 10/06/2017
Location: United States
Posts: 9

Posted: 02:23pm 08 Dec 2018

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Ross,

I'm TXing a string of U's at 2400 baud. I can see the bursts on the SA well but have to get the averaging (peak hold) working. I used your settings from the Rigol and it was right on. Don't know what RBW and VBW really do. I just need to get the ref level correct. More playing. It was late. I'll try more today.

I'll let you know the results when I get it working.

Thanks!

Bob C.

RossW
Guru

Joined: 25/02/2006
Location: Australia
Posts: 495

Posted: 08:12pm 08 Dec 2018

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BobC said Ross,
Don't know what RBW and VBW really do.

In brief, the smaller the RBW (Resolution Bandwidth) the lower the noise floor, but the greater the sweep time, and the finer the "detail" you can see of signal.

The VBW (Video Bandwidth) is the filtering after the raw signal has been collected. A narrow VBW will help you pluck a narrow spike out of the noise, for example.

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