Modified VK5JST Antenna Analyser

 

 

The first one worked fine, but as others have commented, I didn’t find the tuning rate convenient, nor the fine tuning.

I decided I only wanted to cover up to 10m, so changed the bands to only 3, with less redundant overlap.

It now has the following ranges:-

Low      1.54MHz   to   5.01MHz

Med      3.63MHz   to   11.75MHz

Hi        10.67MHz   to   35.23MHz

Range selection is by a three way toggle switch, with LEDs to indicate the selected range.

Tuning is via a 10 turn pot, there is no need for  fine tuning.

 am brd

The board was modified with a cut-out to clear the pot. The extra mounting screw fixes into the new hole at about 10 o’clock from the big hole. Notice the piggyback regulator for the tuning circuit.

fr

 

I decided that the turns counting knob wasn’t useful, and replaced it with a larger plain knob.

Now, just to make a front panel sticker to cover all the screws!

ak

ah al

Leave a Reply