Here's a complete AM transmitter flow graph for GNU Radio 3.7 and Ettus B2xx. It uses offset tuning to eliminate the DC offset on the transmitted carrier. It can also send DSB. The test file is available here:

http://www.w6rz.net/ssbaudio.wav

Ron

On 6/24/20 08:01, Barry Duggan via USRP-users wrote:
Hi Ernest,

Look at https://wiki.gnuradio.org/index.php/File:USRP_AM_xmt_fg.png
You will need to adjust your RF frequency.

Attached is the grc file for it, but it is for 3.8. If you need to look at any of the parameters, use your editor for my grc file to find them.

If you do not need the exact 1M sample rate, I would replace the rational resampler with a float to complex block and use a sample rate of 960000 into the USRP Sink.
---
Barry Duggan KV4FV


On 2020-06-24 02:01, Ernest Poletaev wrote:
Hi Barry,

Thanks, I was looking at this tutorial, but was unable to figure out
how to modify it for UHD.

My requirements are:

RF Freq: 295.1Mhz
Sampling rate: 1M
Audio sampling rate 44.1 / 48 Khz

I'm using GNURadio 3.7 (old format grc).

Regards,
Ernest
On 24 Jun 2020 01:41 +0700, Barry Duggan <[email protected]>, wrote:
Ernest,

I recommend working through the
https://wiki.gnuradio.org/index.php/Tutorials, and then when you get to
the
https://wiki.gnuradio.org/index.php/Simulation_example:_AM_transmitter_and_receiver
you could adapt it to using your USRP in place of the ZMQ sockets.

If you need additional help, let me know. (I wrote the tutorial.)

--
Barry Duggan KV4FV

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Attachment: uhd_am.grc
Description: application/gnuradio-grc

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