Tag: hf

Magnetic loop controller PCB – design by Loftur E. Jónasson – TF3LJ / VE2LJX

9A1GS

This is a magnetic loop controller board designed by Loftur TF3LJ and VE2LJX. This PCB was designed by 9A1GS (former 9A3GOS) (me) and assembled by two assembly factories. Each factory made 5 boards (minimum order quantity).

There is one via under the stepper driver which could be a little bigger, but I was driving 2 amps to a stepper motor without an issue.

Original design and documentation: https://sites.google.com/site/lofturj/to-automatically-tune-a-magnetic-loop-antenna

PDF Automatic_Magnetic_Loop_Controller_BOM_and_building_instructions_Rev3-Rev4PCB_r02Download PDF file

You can upload a compiled hex file to a teensy microcontroller or use Arduino environment to modify it and compile it yourself.

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Using Shift, Width and Narrow filter on a radio

9A1GS

Signal filtering on Yaesu FT-891

DEMO WITH VIDEO

When using js8call or more crowded ft8 frequencies, there are signals coming from all directions, some stronger and some weaker. And it looks like this.

Brighter yellow signals are stronger ones, but there are some fading signals in the middle, probably also decodable without a need to isolate them to ‘hear’ them better, but signals on a far right side we most probably need to isolate.

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