Gysel couplers

23/07/2013 graat 0

The Gysel coupler (under construction)   There are many ways in combining amplifiers. Wilkinson dividers, hybrid couplers or rat-race couplers are the best known couplers […]

Remote antenna switch

16/01/2013 graat 0

As a result of the solid state protection found on this web-page I decided to play with a remote antenna switch which could switch up […]

HF amplifier 2 x GS31

12/11/2011 graat 0

Below you see some pictures of my HF amplifier. I used some chain gearing to move a pot-meter together with the vacuum caps and the […]