siglent-qrss

Proof of concept for transmitting QRSS FSKCW with a Siglent Function / Arbitrary Waveform Generator. Tested with Siglent SDG-1032X. Channel 2 triggers the FSK modulated channel 1.

My HF 0 dBm (1 mW) signal into an endfed sloper antenna was heard a few hundred to 1500 km away!

Note: You'll probably need an amateur radio license to transmit on HF! Also check your output for harmonics and use an LPF if necessary.

• QRSS info
• QRSS Plus, grabbers

Usage

Generate the arbitrary gate waveform

• Edit, and run morse_csv.py. This will output output.csv.
• Rename this file to something useful, for example callsign.csv.
• For example callsign.csv becomes waveform 'callsign' in the SDG.
• Load callsign.csv into EasyWaveX and upload it to the generator:

Connect the instrument

• Connect an HF antenna to channel 1.
• Connect channel 2 to the aux input on the back of the instrument.
• Connect a 10 MHz reference. This results in a stable signal and the 10 minute frame grabs can then be stacked for max signal or noise reduction.

Run the sdg.sh script

• Install lxi-tools (Ubuntu): snap install lxi-tools

• Find your device: lxi discover

• Get the waveform name: lxi scpi -a <IP address> "STL? USER"

• Edit at least the variables below in sdg.sh

  • address: SDG IP address
  • freq: frequency in Herz.
  • ampl: amplitude in Vpp.
  • wave: waveform name.

• Run sdg.sh

Channel 1 screenshot:

Channel 2 screenshot: