At ED1R we use industrial ball bearings on our towers to turn the antennas. The ball bearings are reliable IF you protect them properly. We learned this lesson the hard way. After almost three years in service, I feel confident sharing our solution for adequately protecting the SKF bearings on antenna towers.
Some years ago, SDR-Kits used to sell a small prototyping PCB perfect for experimenting with a Vector Network Analyzer. After many experiments, the female pin headers on my prototyping board wore out. Since SDR-Kits no longer sells it, I designed my version of this PCB. The KiCad sources of the VNA prototyping/test board are available on my Github profile.
The year 2020 started with outstanding tropospheric VHF propagation here in southern Germany. For the first time, I was able to copy the VHF beacon GB3NGI from Northern Irland at a stunning distance of 1300km. Read more about this great opening and listen to the audio recording I made.
The ST-Link/v2 is an in-circuit debugger and programmer for the STM32 and STM8 microcontroller families. Due to its capabilities, it is an extremely popular device and clones are available from your preferred Chinese trading platform for less than 5 euros. I recently ordered a few of these cheap ST-Link/v2 clones for a new project. However, making them work was pretty frustrating. Read on to learn about the problem, the symptoms, and the (super) easy fix.
Both ICOM radios, the IC7300 and the IC9700 allow a variable transmission (TX) delay. This comes in handy if external peripherals like amplifiers and/or pre-amplifiers are used. These devices often have slow mechanical relays. It is good practice to wait until the complete transmission chain is ready before RF is applied. Out of curiosity, I measured and verified the adjustable tx delay on both radios.
Earlier this year, Github released their workflow automation tool Actions. Github claims to provide nothing less than * world-class* CI/CD with Actions. After its release in Autumn 2019, I took the chance and migrated the multi-stage CI Pipeline of remoteAudio to Github Actions.
- OLDER POSTS
- page 1 of 8