PA protection system

22/12/2018 graat 0

In order to provide a more clear overview on the protection system. You will find the blockdiagram below: It consists of the Power / SWR […]

Receive splitters HF

25/01/2015 graat 0

To experiment with 2 receive antennas on the lower bands I  needed some kind of splitter / combiner with some isolation between te ports. A […]

600M Power coupler

24/06/2014 graat 0

Below some photographs of my 300 KHz to 5 MHz coupler. The coupler is build on a Philips core. Probably the TN 36/23/15 3C90 material. […]

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 […]

1 2 3