Our local Amateur Radio club is building a Radio Direction Finding TDOA (Time Difference of Arrival) detector that has LED's to indicate the direction (Left or right) of the fox. Here are the build instructions. (Note: this project was originally presented by NZ1J. See his video: https://www.youtube.com/watch?v=mNqUKYkifOo&t=68s ) Here is the completed project: We start with the schematic: Note that you either install PIN Diode pairs s D3 and D2, or Diodes pair D1 and D4. The difference between these is the packaging. If you are ok with Surface mount, then install D1/D4. If you want discrete components use D3/D2. Next is the PCB. The PCB can be ordered using the GRBR files available from the author. The BOM for the electronic parts is as such: Doppler Direction Finder Bill of Materials 11/12/2021 Qty Part Digi-key Part Numbe...
This article describes a few projects that I built from plans for Amateur Radio Fox Hunting. Basically, the hobby/sport is for someone to hide a few low power "Foxes", which are small transmitters that beep or send Morse Code, and then have a bunch of HAM's try to find them. The first project that I built was a Yagi Antenna (Directional receiver) and a 4MHZ Offset Attenuator. The attenuator is needed when you get close to the fox and you need to reduce the power of the received signal. I struggled with this setup because, on my first 2 fox hunts, there was too much reflection and multi-path interference. This causes false direction detection and if you are not mentally prepared for this, you want to throw all of your equipment into a garbage can and take up a different hobby. There are some truly strange individuals who find this frustration fun and enjoy making other people suffer, but I will leave that discussion for another day. Anyw...
I purchased a new BoXZY (3D printer, laser and CNC Mill) and have been pretty pleased so far. See https://boxzy.com/ One little issue though is that I have been trying to configure it so that I can 3D print from my laptop without having to connect a USB cable to the printer. The layout in my office is not convenient for the cable to span across the room. Also, when I start using it for CNC Milling, I do not want to necessarily have my laptop too close to the router making all the dust. My first attempts to install Repetier Server on various platforms was less than successful. I found that I often would get the error message "Exception during socket read:Too many items in the combo box" when I connected the application to whatever server that I configured. What confused me is that it would work perfectly on one of several computers,. but I could not find a root cause. In addition, I received a Smart Controller (Beta) from BoXZY which came with Windows 10 H...
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