Coaxrelay homemade out of cheap relays
The need for coaxrelays for the new 50-70 MHz amplifier led to this design. I had very good experiences with the Fujitsu relay which datasheet […]
0 – 100 MHz
Coupler from 1.5 to 70 or 80 MHz
Coupler from 1.5 to 70 or 80 MHz Published here are 2 couplers with a T94-2 and a T94-6. The first coupler was build with […]
Universal triode input board
To build another tube amplifier, I needed a matching to the 50 Ohm output of my solid state transceiver. It had to be universal and […]
Receive splitters HF
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
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. […]
HF-high power coupler 1,5 – 30 MHz
For my Arduino power / SWR meter needed a coupler for 1.5 – 30 MHz. It was easy to find a design. I used the […]
70 MHz low pass filter
Low pass filter for 70 MHz In need of a low pass filter for my 70 MHz transverter, I decided to build the filter […]
Remote antenna switch
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 […]
Using the specan as a dipmeter
Using the spectrum analyser as a dipmeter For a long time I never had the need to have a dipmeter for HF and VHF. This […]
HF amplifier 2 x GS31
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 […]