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.
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@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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ikjtel -
Владислав Д.