SDS100/SDS200: SDS200 Noise with new firmware

[dave3825]

@JoeBearcat

What is the range of the noise display on the 200? I have seen it as low 200 and as high as 32000. Yes, that's 32 thousand. Getting a decent signal -82dBm with no decode errors and that shows 4285 noise. The noise is all over the place. What is minimum and maximum values it can display?





I have the latest firmware installed.

 

[sonm10]

@JoeBearcat

What is the range of the noise display on the 200? I have seen it as low 200 and as high as 32000. Yes, that's 32 thousand. Getting a decent signal -82dBm with no decode errors and that shows 4285 noise. The noise is all over the place. What is minimum and maximum values it can display?

View attachment 154667

View attachment 154668

I have the latest firmware installed.

I think the same question was asked when UPMAN was still alive. I think it is Uniden proprietary defined number.

 

[dave3825]

And also @JoeBearcat

Should noise be fluctuating in the 5 digit range when,

1. holding on a conventional freq with no active transmissions?
2. holding on the same conventional channel, with the antenna disconnected?
3. without any favorites enabled or scanning, and the antenna still disconnected?

Also, in all situations listed above, high noise level displaying with squelch settings from 2 to 19, and no antenna...

 

[Ubbe]

It indicates the audio level of the signal. If you have a strong carrier without any modulation it will say 0. As soon as you start to modulate with voice it goes up. If you receive a weaker signal with some noise it will be detected as audio and the value goes up. If you modulate with a data signal it goes way up in value. If you have no carrier at all and squelch set to 0 it will be all noise in the audio and will show the higest vlaue, that will change depending of AM/FM/NFM and filter and IFX settings and the general local RF noise level.

You can only really use the value when you receive analog transmissions and look at the value when no one are talking and there's a steady carrier, and then change settings to get as low noise value as possible, but your ears are probably equally good at judging the background noise even when a conversation are taking place.

/Ubbe

 

[dave3825]

So with no antenna, no signal, and nothing scanning, should it be fluctuating?

 

[Ubbe]

So with no antenna, no signal, and nothing scanning, should it be fluctuating?

Yes. It should be almost constant but isn't due to different imperfections, the receiver chip, how the software are doing the detection and sampling of the value. My Noise are going from 10000 to 45000 without any antenna and hold on a channel.

/Ubbe