Aim: Monitor multiple HF aeronatical frequencies & automatically record audio when voice is active
HF Voice Recording Software
JSquelch – Created in Linux https://github.com/jontio/JSquelch
Testing to be conducted in Linux:
1) Check if JSquelch records voice when voice is active and stops recording when voice is finished
2) Check if multiple instances of JSquelch can be opened
Windows version – this has been ported over from Linux. Testing shows that audio files are created without voice. Issues experienced with Windows audio settings creating an audio loop back. JSquelch has been found to crash / close down without any errors appearing.
Linux SDR Software
KA9Q-Radio https://www.sdrutah.org/info/using_ka9q_radio_with_the_rx888.html
Video showing KA9Q-Radio decoding multiple HFDL frequencies using dumphfdl https://www.youtube.com/watch?v=ziB_JM6ZM9M
**Is it possible to use KA9Q-Radio with a Linux ALE decoder mirroring the HFDL system above? The only Linux ALE decoder I can find is LinuxALE https://github.com/DigitalHERMES/LinuxALE
Video showing the G0ORX GUI for KA9Q-Radio by John Melton https://www.youtube.com/watch?v=K5ml2SuGNSs&t=4s
SDRangel – https://www.sdrangel.org
PhantomSDR – https://github.com/PhantomSDR/PhantomSDR
SoapyRX888 – https://github.com/cozycactus/SoapyRX888
Antenna
Using a WellGood v4.1 loop antenna https://www.george-smart.co.uk/projects/wellgood-loop
Built by Mike with a Coax loop attached to a hula hoop https://www.merseyradar.co.uk/m1geo-wellgood-active-rx-loop-antenna
Alternatives
LZ1AQ https://active-antenna.eu/amplifier-kit – this same antenna is used for the KC2G online RX-888 MKII https://websdr.kc2g.com/radio.html
1.6M Copper Tube for WellGood (Roland hb9vqq) – https://bsky.app/profile/hb9vqq.bsky.social/post/3letnx6ugkk2o
Modifications / Upgrades
Thermal Improvement – https://ka7oei.blogspot.com/2023/08/improving-thermal-management-of-rx-888.html
Filter-Preamp Turn Island Systems Filter-Preamp-v1-rev-2.pdf
Blog about needing a 30MHz Low Pass Filter / Shelf Filter https://ka7oei.blogspot.com/2024/12/frequency-response-of-rx-888-sdr-at.html
Changed the included USB cable for one of these 0.5m USB 3.2 Type A to B Cable, 5Gbps, Anthra Line – Cables & Adapters from LINDY UK
Cypress FX3 Windows 11 driver – Solved: Fx3 Driver for window 11 – Infineon Developer Community
Computer
HP Prodesk 400 G5 MT / i7-8700 / NVIDIA T600 GPU
CPU fan changed for a Noctua NH-D9L https://noctua.at/en/nh-d9l and the chasis fan with a Noctua NF-A9 PWM https://noctua.at/en/nf-a9-pwm – both keep the PC near silent
RFI
I have created a dedicated page to RFI being received with the RX888 and WellGood Loop www.airband-radio.co.uk/rfi