February 2026
I’ve re-started my experiments with an RX-888 MK2 SDR – this is an excellent receiver due to it’s 32MHz bandwidth, allowing you to monitor the full HF band.
I’m running Ubuntu 24.04 with ka9q-radio & wa2n ka9q-web web interface.
Using this setup I’d like to:
Record voice from multiple HF SSB aero frequencies in real time
This is challenging as there is constant noise on HF and it’s difficult to extract only voice when voice appears. The only software I’m aware off is JSquelch.
Turn the speech from the voice recordings into text
Using Linux software called Whisper
My RX-888 has been modified as per this page https://ka7oei.blogspot.com/2023/08/improving-thermal-management-of-rx-888.html
I’m using the N4CY version of a LZ1AQ loop antenna https://active-antenna.eu/amplifier-kit
One of the major challenges has been reducing interference which continues to be an ongoing battle. Here are some of the things I have done so far:
Once connected this is the spectrum display I’m seeing
Unfortunately I suffer from VDSL interference between 8.5 MHz to 12MHz which is band U2 according to this document
The VDSL interference is not originating from my property as I have fibre internet and I’ve been unable to eliminate or reduce the interference.
Next Steps to reduce interference
-
- Mains power line filtering using a GM3SEK Mains Filter
- Material 75 ferrites to be placed on all power leads in the house Fair-Rite
Links
Previous page with my experiments reducing interference www.airband-radio.co.uk/rfi
Original plan for using the RX-888 www.airband-radio.co.uk/rx888