[Lowfer] AC utility meter data signal

[Dexter McIntyre W4DEX]

I just uploaded a spectrum display of my utility meter transmitting it's 
data.  It appears most of the energy is around 4 kHz but the 
transmission can be heard well up into the AM BC band.  Maybe higher.  
I've been trying different antenna configurations trying to detect other 
meter transmissions in the area.  This evening I was able to detect at 
least a dozen.  Fortunately most are very weak.  Only the one on my 
house and another on my property creates significant QRM.

http://www.w4dex.com/misc/ac_utility_meter_data.jpg

Dex