I recently acquired a used –and seemingly a little faulty– uSDX+. These are the little SDR transceivers all over eBay based on the tr(uSDX) devleopment and produced by a plethora of vendors of varying quality. I believe mine is what is called the ‘white buttons’ model — in reference to the different variations that turn …
A few months back I got a chance to head out on another fox hunt in the same public conservation land. Again, using the Yagi with 4Mhz offset attenuator, I was able to quickly locate the general area of each fox, but up close to such strong signals (5W Baofeng transmitters), I was again completely …
While a collection of pieces sitting on the bench is great for playing around, if I plan to deploy my foxhunt transmitter to the real world, I need to package it up for the outdoors. Many of the larger foxhunt transmitters seem to use ammo cases or pelican cases, which should be fairly waterproof. Trying …
Since the Mic and Speaker on the Baofeng share a pin, I found I can use the same pin I use to monitor the DTMF to output CW as well. Quick software update, borrowing heavily from the code I found for the DTMF foxhunt controller, which included functionality to tone out CW messages, I was …
I came across a series of Youtube videos which referred me to a now defunct website where someone had posted Arduino codes for a couple of foxhunt controllers– one of which used DTMF codes to activate/deactivate or play special tone sequences. I thought that sounded nifty to potentially add to my controller, so I eventually …
I had some free time and wanted to move the circuit to a more usable/permanent design, so I got an Arduino Uno prototype shield and moved the circuit over. This was my first time doing this type of work, so while my connections ultimately worked, my layout was a bit lackluster, crossed-over wires and most …
One of the first mods I wanted to make to my initial Baofeng Foxhunt Transmitter was to replace the clunky 5v relay with a more efficient transistor to switch the PTT. Not having a lot of electronics engineering experience, I did a little research into some ‘transistor as switch’ circuits and a general purpose NPN …
I thought it would be a fun project to try to put together my own foxhunt transmitter. While I initially thought of several ideas for low power transmitters, most designs require some knowledge of transmitter circuits to avoid harmonics and things of this nature. I figured it would be easier to start by leveraging a …
As a next step in my foxhunting setup, I was looking to build an attenuator. I had seen a few different plans and styles, but came across a great little kit from KC9ON for his v5 Attenuator and picked it up for about $15 shipped. The kit comes with all the parts well labelled and …
I always enjoy a good project, so when I came across what looked like a good beginner antenna project I couldn’t resist. I had heard a bit about foxhunting, an activity where hams use various methods to locate a hidden transmitter, and came across a local group, the NEMassFoxHunters, who hides transmitters throughout the summer …
