[op25-dev] OP25, SDR, DMR, TX

ikjtel ikj1234i at yahoo.com
Tue Jan 21 23:40:19 UTC 2020


 Greetings Vladislav
Unfortunately these block functions are not represented in terms of GRC blocks. You're correct that dv_tx.py is at present the only implementation (aside from its big brother, multi_tx.py)

Also AFAIK the rtl-sdr is a receive only device - it's not usable for transmitting.  Don't know about the limesdr...
Max
    On Monday, January 20, 2020, 11:46:01 AM EST, Владислав Д. <quasar1902 at gmail.com> wrote:  
 
 Good evening,
Would You kindly to answer a few questions about the OP25 project and how to organize a transmitter with it using SDR devices (RTL-SDR, LimeSDR)?In the creation process of DMR-standard transmitter in the GnuRadio environment, we came across the absence of some necessary blocks: 4FSK modulator, DMR encoder, packet shaper.Inside the OP25 project we found a file that contains some functionality of DMR TX (dv_tx.py), but only in form of code, not as a GRC block.
Could you tell us does this file fully implements the TX-side of the DMR system and whether there is an analogue of it, in the form of a GRC block for GnuRadio?
We will be very grateful if you can help us sort this out.

Yours faithfully,
Vladislav.
  
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