2017-08-08, 04:50
One final experiment for the night...
I still have my software defined radio dongle connected to my Blitzortung receiver's amplifier output.
Then I started recording...
After a couple of minutes, I turned off all the circuit breakers in my house.
(Lower on the waterfall is earlier in time.)
![[Image: F7YYhA7.png]](http://i.imgur.com/F7YYhA7.png)
Lots of noise is eliminated, but not everything! Those pesky 25 kHz and 60 kHz signals are still there..
Next, I left everything off for a couple minutes, then I turned the breakers back on.
![[Image: PdA3bmj.png]](http://i.imgur.com/PdA3bmj.png)
You can see interesting emissions as my devices powered back up. I suspect that this coincided with routers booting up, etc.
I still have my software defined radio dongle connected to my Blitzortung receiver's amplifier output.
- I turned all the (LED) lights on in my apartment, and switched on as many gadgets and devices as possible (my PC, fans, radio).
- I powered my Blitzortung receiver from a USB battery pack.
- I disconnected my laptop charger (the laptop that I used to record this data) from its outlet. The charger generates significant interference, which tends to confound my measurements.
- I set up my software-defined radio dongle and GQRX to record a waterfall plot that was five minutes long.
Then I started recording...
After a couple of minutes, I turned off all the circuit breakers in my house.
(Lower on the waterfall is earlier in time.)
Lots of noise is eliminated, but not everything! Those pesky 25 kHz and 60 kHz signals are still there..
Next, I left everything off for a couple minutes, then I turned the breakers back on.
You can see interesting emissions as my devices powered back up. I suspect that this coincided with routers booting up, etc.
Stations: