Decoding DMR

Need help installing or figuring out something about your SDR? Ask here.
Post Reply
SloCharlie
Posts: 8
Joined: Tue Jun 12, 2018 9:52 pm

Decoding DMR

Post by SloCharlie » Sat Aug 04, 2018 12:02 pm

Hi,

What I am doing wrong?
I use SDR Sharp & DSD+ & VB Cable
If I select WFM and select audio out in windows setting to speakers I can hear digital sound (buzzing and strange sounds) on NFM I can not hear anything (only see waterfall).

However when I set audio to VB cable DSD+ doesn't decode anything.

Screenshot is i att.

https://ibb.co/dhHJke

SloCharlie
Posts: 8
Joined: Tue Jun 12, 2018 9:52 pm

Re: Decoding DMR

Post by SloCharlie » Sat Aug 04, 2018 10:19 pm

Hi,

I managed it to work. I set input device in windows settings and now have sound.
My next problem is, laggy sound. works for sec or two and then breaks up. So I do not understand conversation.

I try to adjust gain and sampling mode to 1,8MSPS but result are the same.

Can you suggest what else can I do to successfully decode DMR?

rtlsdrblog
Site Admin
Posts: 1877
Joined: Mon Nov 19, 2012 11:54 pm

Re: Decoding DMR

Post by rtlsdrblog » Sun Aug 05, 2018 2:09 am

Try increasing the bandwidth slightly above 12,500, so that it covers a little more of the signal. ALso maybe your SNR isn't good enough, work on improving your antenna and tuning your RF gain settings.

SloCharlie
Posts: 8
Joined: Tue Jun 12, 2018 9:52 pm

Re: Decoding DMR

Post by SloCharlie » Mon Aug 06, 2018 8:11 pm

Hi thank you. I did improve modulation. It is not perfect, but defiantly better.

SloCharlie
Posts: 8
Joined: Tue Jun 12, 2018 9:52 pm

Re: Decoding DMR

Post by SloCharlie » Mon Aug 06, 2018 8:12 pm

Ismit possible to run DMR demodulation on Raspberry pi B+?

rtlsdrblog
Site Admin
Posts: 1877
Joined: Mon Nov 19, 2012 11:54 pm

Re: Decoding DMR

Post by rtlsdrblog » Wed Aug 08, 2018 12:26 pm

SloCharlie wrote:
Mon Aug 06, 2018 8:12 pm
Ismit possible to run DMR demodulation on Raspberry pi B+?
Yes, Raspberry Pi 3. It's a bit roundabout as you'll need to use something like Eltechs Exagear to run DSD+ on Linux ARM. See https://www.rtl-sdr.com/running-windows ... -and-more/.

Username
Posts: 321
Joined: Sun Oct 09, 2016 7:27 am

Re: Decoding DMR

Post by Username » Wed Aug 08, 2018 12:54 pm

I see you have "filter audio" on. :lol: deactive it.
you should turn other audio filter thinks also off.
Some people say you should turn "AGC" off but I leave it on.
You should also turn the un.... gain off!

Post Reply