Author Archive for: stefan
About Stefan Helander
I was born a nerd! As a child I was fond of fiddling with all kind of thechnical stuff, discovering how things work and often fixing them. As a 6 year old I fixed my grandmothers 220 volts wiring.
The interest in technical stuff grown even bigger in the teenage years where I got my amateur radio license and developed a keen interest in computers.
Today I am proud to be a nerd. It is a part of my profession.
To all of you nerds and geeks out there - remember that nerd is the new sexy! :)
Entries by Stefan Helander
This is my wishlist for features / fixes for the Anytone AT-D878UV and AT-D587UV DMR radios. Comments, additions and suggestions are welcome, contact me on firstname.lastname@example.org. Maybe the Anytone people will read it 😉 I will submit it through my dealer as well, for them to forward to the Anytone developers.
There is actually no such thing as “analog” APRS. The traditional APRS over AX.25 on 144.800 MHz (or 145.390 MHz in other parts of the word) is actually defined as a digital mode. However, Anytone has a possibility in their radios choose wether to send APRS over AX.25 or as position data over the DMR […]
Looking at many how-to guides for the Anytone AT-D878UV / AT-D578UV and APRS, it can be hard to determine if APRS should be transmitted as FM (20 kHz bandwidth) or FM narrow (12 kHz bandwidth). Some guides show WIDE while others show NARROW. The answer is clear in the IARU region 1 VHF band plan […]
My analog APRS transmissions with the AT-D878UV was not received by any other stations. The problem was that when the codeplug is created (using New in the CPS), the values for Transmit delay and Prewave Time is set to 0 (zero) for APRS and this will not work (probably to battery saving as this is […]
This little APRS-tracker from the late 90’s or early 00’s is a neat little device, however pretty old. It uses an external GPS receiver (via RS232) and connects to a radio, like a HT for example. According to the manual, the configuration utility runs under Windows 95 or 98 (yes, indeed old stuff). I have […]
I got my hands on a used HP Proliant server with P420i raid controller, however was unable to create a logical raid drive using the ACU. A message while booting shows “Hardware RAID support is disabled via NVRAM Configuration Setting“. It turns out the raid had been disabled by enabling hba mode. This can be […]
On a Joomla! 3 site I got the error “You can’t remove your own Super User permissions.” when trying to save global configuration. It turned out some previous admin had set the file permissions on this file so the system wasn’t allowed to write to it. I set rw permissions to it using FTP connection […]
On a site with a valid SSL certificate, sometimes a page load would result in a warning about being insecure. When inspecting the certificate, it turned out to be an old self signed certificate that shouldn’t be in use any more since the site now has a valid “real” SSL certificate. Reloading the page a […]
Suddenly some of my slave servers stopped processing the job queue. Ispconfig version 3.2.9. Investigating the log files. /var/log/ispconfig/cron.log shows: PHP Fatal error: Uncaught mysqli_sql_exception: Data truncated for column ‘warnvirusrecip’ at row 1 in /usr/local/ispconfig/server/lib/classes/db_mysql.inc.php:302 See this discussion: https://forum.howtoforge.com/threads/uncaught-mysqli_sql_exception-data-truncated-for-column-warnvirusrecip-at-row-1.90116/ This is how I solved it. On the master server: mysqldump -uroot -p –add-drop-table dbispconfig spamfilter_policy […]