SWR + Power meter with TFT screen Version III
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 […]
0 – 100 MHz
0-10 MHz receive over UTP?
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, […]
50 MHz Bandpass filter
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 […]
Turns Counter for vacuum capacitor or roller inductor
Introduction For my new to build HF PA I was looking for 3 turns counters for vacuum capacitor and / or a roller inductor. These […]
70 MHz bandpass filter
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 […]
AD8307 Frequency compensated
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 […]
Anode Plate choke and measurements
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 […]
ON4CDU, GPS frequency standard & much more
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 […]
Broadband amplifier from 50 to 450 MHz
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. […]
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 […]