SDS100/SDS200: Detail data help

[Patch42]

On the detailed trunk and conventional screens you can display "NOISE". On digital systems I'm seeing this number bounce all over the place, ranging from 0 to ~40,000. On conventional systems I'm seeing mostly numbers below 100. I'm guessing lower is better, but the wide fluctuation on digital trunking really makes me wonder what's going on.

I also added D-ERROR to the trunking detail screen. Obviously this has something to do with reception errors but I couldn't find anything that explains it in any detail. Is it a cumulative count for the current transmission? Is it an indication of the current error level? Something else even less obvious?

 

[nessnet]

Yaknow... I've been twiddling with 100/200 since they came out and didn't even notice/remember there is a noise choice in there....
Wouldn't noise be measuring exactly what is says? (noise floor)? I suppose it could be useful when figuring out filters, or RFI issues.

Opinion:
In regard to normal (useful) RF/signal type settings, the options that (I) find most useful are the RSSI/RSSI graph and the digital error count.

Think of digital as strings of packets of information. If some of those 1s and 0s don't 'make it' (and in the correct order) - it is an error.
So ZERO error means that all the bits and bytes are making it. Greater than zero, some are not. And yes, current...

 

[Ubbe]

When you see big fluctuation from the numbers in NOISE it's usually a sign of interference. If you are listening to a trunked system it will usually use different frequencies for different calls and just one or a couple of the frequencies could be interfered making the value jump up. When you try different filter settings and the IFX you could watch that NOISE number and try to get it as low as possible. If it goes over 5000 it means it is a pretty bad signal to use and D-ERROR will probably also jump up in the number of detected errors.

The NOISE value increase with modulation so a clean analog signal will show lower numbers than a fully modulated datasignal at the same signal strenght. Uniden made the demodulator filter extremly narrow to try and fight adjacent channel interference. The FM mode are like a standard scanners NFM and SDS's NFM are almost like SFM 6,25KHz in a conventional scanner. When a signals modulation level increase so will also the noise level in SDS scanners, if it is not a fully saturated signal level.

/Ubbe