Old data

[gar]

190811-1048 EDT

I tried to replicate some measurements from a couple years ago.

See thread
https://forums.mikeholt.com/showthread.php?t=186187&highlight=high+quality+emf+meter
and my plots at post 26.

I don't see the 4 and 8 Hz signals now that were present two years ago. Note these are not precisely 4 and 8, are not harmonically related, and not a sub-harmonics of 60.

I do see much more noise now, some of which is from my dimmers, but with my dimmers off there is still more present that looks like dimmers.

Going to a slower sweep rate I see a loss of much of the noise every 22 milliseconds for a short duration. Note 22 milliseconds is 45.5 Hz. Definitely not 50 Hz.

The loss of noise periods looks like a sync signal and thus some of the noise may be data.

This noise was not present 2 years ago. But my sensing coil is not in the same location. Presently the coil is on the dining table, two years ago I believe it was on my bench in the basement.

May try an experiment in backyard and on battery power.

.

 

[hbiss]

The electric meters we have now transmit and receive data via powerline carrier.

-Hal

 

[gar]

190811-1223 EDT

hbiss:

I believe our meters are in the 900 mHz region, and interrogated somewhat after midnight. They also send some local WiFi data constantly.

I do believe that some of what I am seeing is data, but no apparent carrier frequency.

.