On 06/23/2020 01:17 PM, Cameron Matson
wrote:
I've tried from 125K to 16M (which if I request
anything higher is what the device seems to cap it at). The
lower sample rates on the RX side actually do solve the O
problem, which I guess makes sense, but the tG and U are still
there on the TX side, and no packets seem to be decoded.
Cameron
The CPU on the E310 is a dual-core ARM9 CPU clocked at 866MHz. That
means that it can't move very many samples (particularly
full-duplex)
per second for a "complex" signal flow that involves
modulaton/demodulation. When doing pretty-much *nothing* to the
samples, the interface
can move a few Msps. That goes down quickly as you actually have
to do anything to the samples. The E310 has a larger FPGA, and the
"marketted use case" is to do most processing in the FPGA.
Now, as to why, at lower rates, you cannot decode, that's a
debugging exercise perhaps not related, per se, to the E310, but
just
the experimental setup.
How are the two radios "connected" -- via antennae or a cable? If
cable, make sure you have plenty of attenuation in-line (30-40dB),
otherwise you risk damage to the receiver at worst, and at best,
driving the receive chain into non-linearity, producing distortions
and
unwanted mixing products within the first gain stage(s).
What sample rate ranges have you tried?
Sent from my iPhone
Hello
all,
I'm
new to gnuradio and SDR so I hope there isn't
something obvious I'm missing. I'm trying to get a
packet based system set up. I'm using gnuradio 3.7
and UHD 3.14 that I cross compiled and loaded onto
two E312s.
I'm
trying to use the uhd_packet_tx and uhd_packet_rx
examples as a staring point. I made the necessary
modifications to run it as a non-gui flowgraph, but
left all the variables untouched. Both the flow
graphs run, but:
- the Tx flow graph shows an initial tG flag and
then a U flag after every burst (which I
understand has something to do with tag offsets
mismatching https://github.com/gnuradio/gnuradio/issues/1976)
- The Rx flow graph immediately starts outputing
O flags, and no packets are recieved.
I've
tried playing around with the frequency and
sampling rates without much success.
Any
help on where to start would be greatly
appreciated.
Thanks,
Cameron