nepeee / limesna

Scalar Network Analyser for the LimeSDR mini

limeSNA

This is a Scalar Network Analyzer program for the LimeSDR mini. The python code is based on the pyLMS7002Soapy SNA example. I optimized the original code to improve the speed and added a html/javascript based GUI to make it easier to use. For a 400-500MHz sweep with 200 data points(10 point/5MHz), the sweep time is about 17sec. The slowest part of the code currently is the tx/rx tuning(sdr.txRfFreq = xy).

Measuring a diy filter (17sec sweep)

Measuring a dual band monopole antenna (73sec sweep)

Dependencies

• pyLMS7002Soapy Python package: https://github.com/myriadrf/pyLMS7002Soapy
• numpy (pip)
• scipy (pip)
• flask (pip)
• flask_socketio (pip)
• gevent (pip)
• gevent-websocket (pip)

How to use:

Install all the dependencies and run the code from a terminal with the following command:

python sna.py

After the radio is ready to use, the program starts a new web browser with the UI. Press the run button to start the frequeny sweep. For relative("calibrated") measurements wait a full sweep and then press the "Set relative" button.

limesna's Issues

Spike every 5 or 10 MHz depending on sample rate

Not sure if my Limesdrmini has gone broken or the latest update from here but i can no longer measure antennas as every 5 or 10Mhz there is a spike depending on which samplerate i use
here's a screen shot spikes at 410 420 430 etc https://puu.sh/Ds8p6/ee52c6dda1.png done with a 50 Ohm calibration SMA plug

Feature request, allow to select port and channel to support limesdr

It would be great if the port and channel could be selected so the limesdr could be supported as well as the mini