Category Archives: Technical articles

Alpin 100 amplifier high voltage issue

Alpin 100 amplifier high voltage issue

About two weeks ago, my Alpin 100 suddenly failed whilst transmitting. Shutdown with error 52. The manual stated that the high voltage was less than 1500 V or over 3300 V. I tried to restart and immediately went to the HV menu, the voltage was about 2100 V, which was much lower than the expected… Continue reading »

Icom IC-7100 stability test

Icom IC-7100 stability test

Not too long ago, a pre-owned Icom IC-7100 was acquired, as a replacement for the IC-706 mk II. Although the 706 is a small, versatile and a “value for money” little devil, it has its habits. On 2 metres, the frequency drift is very annoying and way too excessive for narrowband digital modes. Even in… Continue reading »

Visiting F6GYH

Visiting F6GYH

In September, I paid a visit to Bernard, F6GYH. Bernard lives in Fayl-Billot, which is about 15 minutes of driving from my French QTH. His location is excellent for VHF and up, because he has nearly 360 degrees unobstructed sight. Even with a tower of modest height, his antennas have a clear view to the… Continue reading »

Do we really need this crap?

Do we really need this crap?

This article drew my attention. Another story about “Megahertz” wireless power transfer. If something is going to kill radio communications, this is spot on: Wireless power transfer Old school efficiency There were times we had trains. Electric trains. In The Netherlands, most railway lines use electricity to convey power to the locomotives (like this one… Continue reading »

The Fox and Hounds

Today, I stumbled upon a write-up of Joe Taylor, K1JT about developing a version of FT8, intended to be used by DXpeditions. In spite of the fact, that I do not favour FT8, especially because it takes out the lower tier of the signal to noise range, I consider this an interesting and valuable development…. Continue reading »