RF construction – The PA3CSG website

28/12/2021 graat 0

In order to get back on 10 GHz EME I needed a feedhorn for my 0.25 F/D dish. Not easy to find! Paul W1GHZ paper […]

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 […]

30/06/2015 graat 0

0-10 MHz receive over UTP? For a long time I had the idea to use UTP (Unshielded Twisted Pair) cable for my receive antenna, […]

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 […]

03/02/2015 graat 0

50 MHz Bandpass filter The last band for this filter was the 50 MHz band. With 6 turns inductor and a 22 pF capacitor it […]

03/02/2015 graat 0

70 MHz bandpass filter When working on the 144 MHz bandpass filters, these were tunable over such a wide range that 70 MHz was almost […]

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 […]

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 […]

24/12/2018 graat 0

Introduction For my new to build HF PA I was looking for 3 turns counters for vacuum capacitor and / or a roller inductor. These […]

21/12/2018 graat 0

I broke my plate choke! It was too close to the coolers of the GS35 in the amplifier. The result was a burned choke. I […]