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What I didn't learn in school about History.

Interesting videos about the fall of intellectual advancement in early 1100 AD.


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"Blinky" TDOA RDF Detector

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...
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Radio Direction Finding - TDOA

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...
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Repetier host "Exception during socket read:Too many items in the combo box" - Solved!

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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