#direction finding

A friend of mine did not know where the septic tank in their home was. I’ve figured out that this could be a fun opportunity for radio direction finding. A while back I bought several super cheap 433MHz OOK transmitters. They are about $1-$2 each -- not too much for literally throwing something down the drain. 

I soldered a small LiPo battery, connecting both VCC and data to the 3.3V+ of the batter, having the device on transmit mode all the time. I also soldered a 10cm wire to the antenna port. 

To keep everything waterproof, I put the setup in a small bag -- and sent it down the toilette with the help of my assistant Alan!

It took a few tries, but the package was drained and started flowing towards the tank. For tracking I used my new IC-705, which has a nice waterfall plot on the screen, so I can see the peak. For antenna, I used the Arrow. 

It was nice seeing how the frequency of the transmitter changes as it is loaded by the water-- but then stabilizing nicely once it set still (consecutive toilette flushing would shift the frequency a little bit!).  Using this setup we were able to identify the location of the tank, which ended up underneath the deck!

The 75 meter amateur band is "4chan for boomers." Drilling fown even deeper, I refer to 3860 kHz as "Prepper City" due to the decade or longer that the alt-right hams have been in there talking about their guns, the end times, and so many geopolitical conspiracies.

Their rage attracts jammers like flies are attracted to a rotting carcass. Here is a nearly two hour video, screencapped mostly in Skywave Linux, of some work geolocating the jammers.

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