Random Tech I d Like to Share
The link between The Exorcist, Amateur Radio and Alan Turing. A quick look at how the movie The Exorcist from 1973 has links to the late great Alan Turing via Mike Oldfield s album Tubular Bells, Scotland and Amateur Radio. It s Halloween so figured why not throw some horror in the mix. When Mike Oldfield recorded [ ]
The Slow Scan TV images below will update every 30 seconds if I m running the reciever for them. You never know what you might see so is kinda cool to see them appear in real time. I m showing the last 20 images which have been decoded, usually from either 20m or 40m bands. Slow-scan television [ ]
A simple and quick project for detecting when a Yaesu transciever is transmitting and feed that status to Home Assistant to then perform actions. This can be used to, for example, automate killing the power if the radio gets stuck TX ing when using automated digital modes software such as WSJT-X remotely. It can also measure [ ]
All my FT8 Awards from https://ft8dmc.eu/
At almost 1000 QSOs with FT8 using WSJT-X I thought I d share a quick set up guide and some tips. I won t go into TX here, only RX for now. 1. Get audio from your radio into your computer obviously can t describe exactly how as it differs for everyone. 2. Download and run: https://www.physics.princeton.edu/pulsar/k1jt/wsjtx-2.2.2-win64.exe [ ]
This article contains information on how to calculate the operating margin of a wireless 802.11 network using a known distance between the two points. I wrote this quite a while ago and although the throughput of wireless links has dramatically increased the basic theory still applies. Of course we now have 5GHz available, which is very useful for this [ ]
Parsing JSON in Bash is never usually the best idea but sometimes it may be necessary or preferred. Here s a nice easy script which uses the jq command to perform JSON parsing in Bash. Let s imagine you have the following JSON which is outputted by a stats gathering process: {"web_rate":1,"db_rate":2,"php_rate":2} Parsing that in Bash by [ ]
Even having written many hundreds of Bash scripts over the years I sometimes forget the basic special parameters which are available. For that reason I ve made this post which is a copy of the page from gnu.org. Original content from: https://www.gnu.org/software/bash/manual/html_node/Special-Parameters.html 3.4.2 Special Parameters The shell treats several parameters specially. These parameters…
If you have an APC UPS you may not, for whatever reason, want the OS to trigger a shutdown. The apcupsd package will call shutdown whenever the battery capacity is reported too low. To prevent this, just edit the following file. Edit /etc/apcupsd/apccontrol with your favourite editor. You should see something like this: APCPID=/var/run/apcupsd.pid APCUPSD=/sbin/apcupsd SHUTDOWN=/sbin/shutdown [ ]
Here is a very simple way to download iPlayer content using a Linux command line tool. This literally downloads the stream and saves it to a file. The best part is, because they re not DRM protected, you can keep it forever. If using Ubuntu there is a PPA so you can install using the Apt package [ ]