Linux: Latency Mitigation

New documents published to help mitigate latency induced issues for Linux users.

VARA HF & Latency Issues With RPI4 Gateways

We found a problem with RPI4-to-RPI4 VARA HF connection establishment and have found the solution.

Hacker News – Via Shortwave Radio

This is a full length demonstration showing a 900km link beyond line of sight. Using robust narrowband data transport bouncing off the ionosphere to access the Hacker News website as well as pull an article across the link. The link is bidirectional and interactive. Using 500hz bandwidth. Later in the demonstration the same data is […]

Packet Radio / QRG Update

This update does not affect anyone using 14.105 LSB with a standard old fashioned TNC. For those operating on the USB QRG, we have recently had to alter the QRG dial frequency slightly up and compensate by moving one of the modem tone pairs down 100hz in order to put sufficient spacing between the multimode […]

New RPI4 Image Available

My first RPI image has been created to flash an SDCard which will boot a RPI4 into a bank of TNCs – ARDOP, Packet and VARA for use simultaneously. With huge thanks to the WheezyE Winelink project for the integration of VARA on Linux, this image includes all the setup tweaks to get them all […]

KickTNC.sh – Raspberry Pi & VARA HF TNC Stabilization

A couple of iterations later and a new setup has evolved to help poke VARA TNC back to life while running inside the box86 emulator. On occasion, the TNC can lose its TCP connection ports and become virtually undetectable. The full scripts and documentation have been published in the Packet Radio section of the site […]

VARAWatch – Wine & Box86 Socket-loss Workaround

The VARA process running within the Wine & box86 emulator environment on the Raspberry Pi4 has a slight issue when VARA TNC dies or is terminated manually or restarted via systemd- this is a workaround for it.

VARA, ARDOP and QtSoundModem as System Services

New article – making the setup run smoothly by leveraging the power of systemd process management to monitor and control the various TNCs with remote provisioning of their interfaces for convenient visual monitoring.