VaPN data flow and considerations
This data flow block diagram highlights the high level view of data movement through the VaPN system to include the option of an Internet email gateway.
Design
Notices of design updates to the various systems and subsystems of the Virginia Packet Network. We document what works and more importantly what does not work.
Going all in for the SCS Tracker DSP TNC
The SCS Tracker DSP TNC wins its way into the overall design of the VAPN.
SCS Tracker DSP TNC at 1200 baud
Our interaction with SCS engineers reaps an improvement in 1200 AFSK performance in their Tracker DSP Terminal Node Controller yielding one TNC with packet modes for DC to daylight.
Moving LPF filters within notional radio assemblies
March 2, 2016 revision of the VAPN high level block diagram.
Adding time-out timer (TOT) and notional assemblies to the VAPN design
More details added to the VAPN block diagram.
Incorporating Direwolf into the VAPN design
Direwolf – What’s not to like The more I learn about the various software demodulating algorithms in the amateur community, the more I like their commitment towards using correlation and other techniques to squeeze a few more good AX.25 frames out of the ether. The Direwolf project appears to be one effort incorporating the lessons … Read more
Adding High Speed Access
Lately I’ve been asking local amateurs what they’d like to see in a packet system that might bring them back to packet. A common complaint is the slow speed of packet. HamNet and other Mesh networks are the systems they speak of while sharing their speed-dreams. Packet systems have offered a TCP/IP telnet capability for … Read more
Multiple port, single node block diagram
A bit of doodling in Visio yields this initial concept for the Virginia Packet Network. Raspberry Pi?!? Yes that is a Raspberry Pi. No it is not a high reliability, fault tolerant system. Plans for an upgrade are already in the works, but let’s face a very nice fact… the Raspberry Pi is a dirt … Read more