Generate the python file
grcc record.grc
Start a record for 10min
timeout 600s ./record.py
Generate the python file
grcc replay.grc
Start a replay
./replay.py
The two USRP RX inputs are used to record a Wide or Multi-band signal.
.-> [USRP RX#1]
[Wide/Multi band signal] --|
'-> [USRP RX#2]
The record.grc script generates one file per input channel.
Please take care of the size of the output files.
Consider to use a storage device with engough bandwidth. A slow device may produce UHD overflow/underrun or GNURadio crashes/freezes.
- Prefer PCIe NVME SSD
- Network storage or external USB storage devices are not recommended
A proposed configuration is:
| Sampling Rate (MS/s) | Data type | Number of channels | Total recording file rate (MB/s) [(GB/min)] |
|---|---|---|---|
| 16 | Complex_Float_32 |
2 | 256 [15.36] |
- Maximum input power : -15 dBm
- Use 30 dB attenuation if the USRP is operating in loopback
Number of channels: 2
For each channel:
- sampling rate (proposed: 16 Ms/s)
- The sampling rate should respect the Nyquist criteria with the signals to record
- The sampling rate must be set according to the network bandwidth on the
[PC] <--> [USRP]link - center frequency [Hz]
- consider a frequency shift of few MHz to avoid interferences due to the LO leakage
- the frequency shift should be compatible with the sampling rate
- gain value [dB]
- bandwidth [MHz]
To set up the parameters'values, several blocks'values (the ones on the image above) have to be modified.:
The two USRP RX outputs are used to replay a Wide or Multi-band signal.
[USRP TX#1] -.
|->[Wide/Multi band signal]
[USRP TX#2] -'
The replay.grc script read two files (one per output channel) to generate a Wide/Multi band signal.
Number of channels: 2
For each channel:
- sampling rate (same as record)
- center frequency (same as record)
- gain value [dB]
- bandwidth (same as record)
To set up the parameters'values, several blocks'values (the ones on the image above) have to be modified.:
