I have been investigating ‘lost APRS packets’, a result of many root causes.
One is a perception that when I drive in the local area, I often do not hear my own digi ‘echo’ yet I find that it did receive a packet and submit it to APRS-IS. This problem is much more apparent using a TNC-X that with any other KISS TNC in its place. Continue reading TNC-X – channel access behaviour
During recent evaluation of a range of APRS servers and TNCs, I have inspected APRS-IS records and my own server logs to identify possible anomalies caused by the equipment under test.
In that time I have found defective records caused by digi / iGates: VK2JMA-5, Vk2YGV-5, VKWUWP-2, VK2UWP-1, VK2MPJ-1,VK2ZEN-5, VK2AMW-1, VK2RHR-1, VK2LKH-1, VK2MB-1, VK2BEN-1. Continue reading Does anyone assess to their digi / iGate performance?
An APRS iGate necessitates some form of computer in the centre of the configuration.
Over recent weeks, I have evaluated a number of configurations for VHF based on Windows and Linux (RPi) to assess their reliability, though it is doubtful that a configuration to rival UIDIGI reliability and availability is likely. Continue reading Towards a reliable APRS iGate
On 01/09/14 I commenced upgrade of Ubuntu 12.04 LTS “precise” to Ubuntu 14.04 LTS “trusty”. (LTS is for “Long TIme Support” and it is supposed to be the reliable stream rather than experimental.) Continue reading Ubuntu LTS upgrades get better – v14.04
APRS is characterised by a lack of standards or guidance, but mostly by a lack of compliance with those standards and a lack of understanding and common sense.
VK2UWP is travelling around the countryside and from the look of it, setting up a WIDE2 digipeater in the local caravan parks without regard to its dysfunction. Continue reading The mobile APRS W2 digi left town this morning
In Australia, conservationists have led a push for replacement of a range of appliances that were in good working condition for more energy efficient appliances. For this reason, some types of appliance can no longer be purchased, or serviced with spares as required.
The humble flourescent light is one of those. Although still one of our most efficient lights, rivalled only by the best of LEDs, the push is on to replace the conventional magnetic ballast flourescent T8 flourescent with T5 lights, and in the interim, T8 lights with electronic ballasts. Continue reading The fraud of energy efficient lighting – e-ballasts
BLHeli v12.0 has been released. Continue reading BLHeli v12.0 review
A very quick trial of aprx v2.08 was concluded in less than 24 hours. Continue reading Headless aprx server – trial wrapup
In the continuing trials of APRS digi+iGate servers, an aprx server running on a RPi.
Continue reading Headless aprx server trial
I have been investigating ‘lost APRS packets’, a result of many root causes.
One is a perception that when I drive in the local area, I often do not hear my own digi ‘echo’ yet I find that it did receive a packet and submit it to APRS-IS. This problem is much more apparent using a TNC-X that with any other KISS TNC in its place.
A possible explanation is that it did echo but I did not hear it due to collision with another digi.
So that led me to explore whether TNC-X fails to quickly detect the other digi already transmitting. Continue reading TNC-X – DCD behaviour