Prerequisites: Raspberry Pi running up to date Buster rtl_fm has been installed and successfully tested SDR dongle has been calibrated direwolf has been installed and configurated rtl_fm and direwolf can be started without errors using the command line At this stage rtl_fm + direwolf couldn’t be started using a cron job as described in the […]
Category: Diversen
Calibrating an RTL SDR dongle
When uring an RTL SDR dongle with a graphic SDR application you will probably notice that the dongle is not spot on to the frequency. Especially when using the waterfall view you can see the peek of the signal beside the expected frequency. When using the dongle in a ‘headless’ application this can lead to […]
Teletron VKE ‘Flugsicherungsempfänger’
A long time ago I’ve bought a rack with some AM VHF receive modules at a ham flea market. The receive originated from an airport nearby where it had been part of the ATC systems. The gear I’d bought was typical German and therefore rugged material. But due to its size, the work which had […]
Garmin eTrex 30 repair
After about 10 years of usage the ‘back’ button of the eTrex 30 had completely disintegrated. Regarding age and usage this wasn’t an unexpected issue. Unfortunately Garmin didn’t offer repair nor spare parts for this unit anymore. So after some research a spare front shell was ordered via one of the known Chinese webshops. The […]
Cupholder mount
As the interior of a modern car often offers limited space and because it’s a pity to drill holes everywhere I’ve been searching for a way to mount the head of a (Motorola) radio in a non-destructive way. Also a larger car offers almost no options to mount a radio. But I’d found one spot […]
Double the value of an Inrico!
Some time ago the Inrico ‘network radios’ saw the light, together with similar device by exotic brands. The units look similar to portable or mobile transceivers, but that’s also the end of the similarity. In fact these ‘network radios’ are nothing else than Android based smartphones with an MTK board. A PTT button has been […]
DMR thoughts
‘Do you quit DMR?’ This question was sent to my by mail about half an hour after I’d put my Hytera handheld for sale on a second hand website. ‘Did I ever start it?’ was the question I was thinking of… Some years ago I’ve been playing around with DStar. I’ve been using an Icom […]
First 2m simplex QSO from the KWA tunnel
On Friday February 10th. 2017 probably the first QSO took place from the King Willem Alexander tunnel in Maastricht. While driving into the tunnel I’ve had a QSO with Pascal PB1SAM who was also driving home from QRL. At the time I was entering the tunnel he took the old northbound A2 route at the surface […]
Former antenna sorrow
When sorting out some old file I’ve found an old video and the story linked to it. Some two years ago I’d got the plan to decorate my roof gear with a Hygain AV-620. I had heart a lot of praise about this antenna and I could buy a used one in good condition and […]
Something I haven’t done for a long time: a frequency list
While planning a short holiday on the island of Texel I’ve decided to take a scanner with me. Since the deployment of the Tetra network C2000 listening to a scanner has died very soon. And indeed there is not much left to listen to: companies have moved to cell phone usage, just like cab drivers. […]
