100 – 1000 MHz – The PA3CSG website

30/12/2020 graat 0

The PASTA-Meter Version III of the power and SWR meter. This time with nextion TFT screen. Because of TFT screen it looks nice and for […]

23/11/2018 graat 0

Preamp using the ATF54142 FET This design was made in 2006. It came back to my attention as my friend Jack PE1KXH asked for another […]

10/04/2017 graat 0

The AD8307 is a nice logarithmic amplifier with a lot of uses for amateur radio. My SWR Power meter is build around it. (LINK) The […]

05/05/2019 graat 0

On his webpage Hans published his GPS receiver already a long time ago. It can be found HERE As an extra Hans put in the […]

27/07/2017 graat 0

For my newly build 50-70 MHz amplifier I needed a suitable driver. I needed about 5W drive. I started with a CATV module, the BGY888. […]

10/06/2017 graat 0

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 […]

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 […]

31/01/2015 graat 0

144 MHz Bandpass filter revisited The 144 bandpass filter as shown on my website (here) has been a very popular article. It was the most […]

03/10/2012 graat 0

For operation on 2320MHz I needed a receive power splitter for my IF 144 MHz. It had to cover the 100-150 MHz range. The first […]

17/02/2012 graat 0

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 […]