Tobias (DH1TW)

3 minute read

40 inch TV desktop monitor

My standard development environment was for some years a 24” standard HD monitor together with the 15” Retina display from my Macbook Pro. Recently I felt more and more frustrated about continous window tabbing. The available screen estate was just not enough anymore.

In my search for a bigger screen, I wondered if it wouldn’t be possible to use a 4k TV instead of a pair of > 28” PC monitors. The advantage of the 4K display is of course its resolution of 3840px x 2160px and much more afforable price than a comparable set of PC monitors.

There are several things to consider when upgrading to 4k displays, but in my case, everything worked out well - almost out of the box. I couldn’t be happier with the result!

Tobias (DH1TW)

2 minute read

cart for deploying antenna radials

At our Contest Station ED1R we are limited in space. Therefore we have to install before the contests our low band verticals and beverages - and of course after the contests, take them down and bring them into the storage again. Over the last years we started optimizing the way how to rapidly deploy and remove radials.

Earlier we used a bunch of garden hose carts, which were inexpensive, but after three contest seasons, they started falling appart. A more solid solution was needed.

This time we build a solid cart, using surplus military equipment.

Tobias (DH1TW)

3 minute read

Once your contest station grows bigger and you add more antennas to turn, it becomes quite annoying to move around the physical rotator controllers between the operating positions inside the shack. Desperate for a better solution, I developed a server software which provides access to the Rotators through the network. Now all rotators can be controlled either directly through Win-Test, TCP socket, or through a Web-Interface.

Tobias (DH1TW)

2 minute read

dg8saq vnwa

A few years ago I migrated almost entirely to OSX & Ubuntu. However I still had to maintain a Windows copy on one of my harddrive partitions, since a few applications were just available for Windows. In particular, DG8SAQ’s superb Vector Network Analyzer (VNWA) software. I can already use most of the applications in a Virtual machine, with the benefit of not having to reboot and change the OS, but DG8SAQ’s software with it’s USB I/O always gave me hard time. Finally I figured out what need’s to be changed. Now the VNWA runs also smoothly in a Virtual Machine.

Tobias (DH1TW)

2 minute read

dxheat landing page

Over last 8 month I was digging deep into Web Development. The result went yesterday public – DXHeat.com. Instead of building just “another” Web DX Cluster, I tried to build something innovative with new, unique features. Best is to check it out by yourself!

Tobias (DH1TW)

3 minute read

garden hose cart reused for deploying radials

At our contest station ED1R we have no space for permanent Lowband Verticals. Each Contest, the verticals have to be installed temporarily in a field nearly. Especially the deployment and removal of the antenna radials is very time consuming. Over time we optimized our system which reduced the required time from 2 hours down to 30 minutes.

Tobias (DH1TW)

2 minute read

the end of an oxidized coax cable

This question bugged me after trying to exchange the connectors of a 25m long Aircell7 coax cable. During preparation I discovered a black inner conductor. I seems water entered the cable. Do I have to throw it away? Read more to discover a probably unexpected answer!

Tobias (DH1TW)

3 minute read

4O3A triplexor with switchable terminators

Until today, I’m fascinated what can be achieved with good filters. At our Contest Station ED1R we bought a Triplexor (10m/15m/20m) in order to be able to use our new Optibeam OB11-3 on the three bands simultaneously.