Technical Topics > Software

DRM heavy childbirth 02 Mar 2021

<< < (2/2)

~SIGINT~:
The general consensus with v2.2 is that a lot of people cannot get it working, myself including because I am not using Windows 10. I would have to re-compile the source code and I cannot be bother right now. I am using the tried and proven v2.1.1 svn808.

My experience has been:
  -98 dBm, good lock;
-100 dBm, intermittent, decoder mildly breaking up;
-106 dBm, decoder now breaking up most of the time and no audio;
-112 dBm, no longer decoding.

And from my testing, the best decoder settings are:
Frequency Interpolation = Linear
Time Interpolation = Linear
Time Sync Tracking = Guard Energy
Number of Iterations = 1
No ticks in any of the selection boxes. (The bandpass filter can at times help if there is heavy interference.)

Molson Canadian Eh!

redhat:
Of course, signal measurements are rather meaningless without some SNR or noisefloor measuring.  S9 for me likely would not be enough due to my high suburban noise floor.  Likewise in a quiet rural setting s5 may be enough.

Not to be too snarky, but S9 is -73dbm.  Therefore S9+20 is -53dbm.

+-RH

ChrisSmolinski:
Even in my fairly low noise floor rural environment, it takes a lot of signal to get DRM to decode. It's a lot of effort for little result.

~SIGINT~:
In my 02 Feb 2021 test the noise floor was approx -120 dBm and the SNR on the the Brazil DRM Experimental broadcast was 36.4 dB. The SNR in the DREAM application was at 19.9 dB. It was coming in good and strong. The station does not appear to be broadcasting at this time or is no longer making it up this far North. I would have to check a WebSDR in that region of the world to see if it is still on the air.

~SIGINT~:
For all interested, I have shared some screen shots of the Brazil DRM Experimental transmissions captured between 2 and 4 February 2021, including screen shots of the DRM NewsService Journaline service.

Enjoy

http://www.milspec.ca/radiodx/

Navigation

[0] Message Index

[*] Previous page