Month: April 2020

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 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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Anytone 578 mobile and 878 handheld VHF/UHF ranging and remote monitor

9A1GS

Among other great functionalities available on Anytone DMR radios, I just recorded how you can initiate a remote monitor and ranging request from one radio to another.

With ranging request, the receiving station is replying with a location. On a successful receive, initiating station either shows you distance/bearing between two radios or GPS coordinates of the second radio. If a receiving radio, that initiated a request, has a GPS lock, distance and bearing will be shown. Without a GPS lock, just a GPS coordinates of a remote radio will be shown. Of course, remote radio needs to have a GPS lock.

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