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NMT base station solution: Osmocom and Linux

PostPosted: 2016 Jul 12, 15:06
by fmc
It's been awhile but just this week i noticed an interesting project on Github referencing NMT base station, and today i probably made the first proper phone call on NMT service in this country since service shut down! It is software solution for operating A, B and C-Netz, NMT and even AMPS basestation at home. It requires two radios with ability to transmit and receive on the correct frequencies. It is part of "Osmocom" project, Open source mobile communication as it stands for.

https://osmocom.org/projects/osmocom-analog
http://git.osmocom.org/osmocom-analog/

It runs on a Linux based system with two soundcards for speech back and fourth.

All credit goes to Andreas Eversberg and rest of people behind Osmocom for making this happen!

Short test: https://youtu.be/Zjz9EAR9j_k

Re: NMT base station solution: Osmocom and Linux

PostPosted: 2016 Aug 06, 15:16
by bengata

Re: NMT base station solution: Osmocom and Linux

PostPosted: 2016 Aug 10, 14:48
by bengata

Re: NMT base station solution: Osmocom and Linux

PostPosted: 2016 Aug 10, 23:11
by fmc
Hi bengata! Glad to see you also got it working! I am wondering, have you been able to test SMS functionality in compatible handset? My main radio is not working anymore and i have also sold computer i have used for software so i haven't been able to do anything with it in a while.

Re: NMT base station solution: Osmocom and Linux

PostPosted: 2016 Aug 14, 16:12
by bengata
Hello .

I tried to test the SMS function. I tried three different phone. Nokia 650, Benefon Dragon, Nokia 450. But I could not send SMS. I changed the numbers from 767 to 9999 and still could not send SMS. The program understands that soil sending sms.but the connection breaks down and SMS not sent .For me the problem is most likely in the transmitter. It has a very low power 10 mW should try a more powerful

Re: NMT base station solution: Osmocom and Linux

PostPosted: 2016 Aug 16, 13:19
by bengata

Re: NMT base station solution: Osmocom and Linux

PostPosted: 2016 Oct 20, 17:59
by fmc


Can you give some info on your setup? I am planning to buy new radios for this project, my radio is broken and i am using old TV set for receive audio right now. Ideally i want to buy the cheap Baofeng ones but i have been unable to interface them with my computer as they use voltage for PTT switch.

Re: NMT base station solution: Osmocom and Linux

PostPosted: 2016 Oct 22, 12:15
by bengata
https://www.youtube.com/watch?v=XF_5jcAPpPA

https://www.youtube.com/watch?v=i_GyeAZcebo

You do not need to use voltage for PTT switch. Baofeng It has a function VOX we simply activate it . Then when the input received signal will turn on the transmitter .I use special transmitters which transmit continuously. A receiver for use Motorola P080

Re: NMT base station solution: Osmocom and Linux

PostPosted: 2016 Oct 23, 13:42
by bengata