Power Line Carrier RF Signal Always on and it is a Pure Tone

We must demand  a Federal investigation into the Environmental pollution caused by the BPL/PLC backbone of the so called smart grid…..Sandaura

Moreover, the report asserts that the field emission requirements for PLT should be somewhat more restrictive than the 20 dBμV/m limit because the PLT signal might be an ”always on” signal, and the geographical concentration of PLT units within a certain area might be fairly high.

NTIA Report 04-413

POTENTIAL INTERFERENCE FROM

BROADBAND OVER POWER LINE (BPL)

SYSTEMS TO FEDERAL GOVERNMENT

RADIOCOMMUNICATIONS AT 1.7 – 80 MHz

Phase 1 Study

VOLUME II

technical report

FF.4 REGIONAL DEPLOYMENT MODEL

In order to assess the aggregated electrical field strength arising from future,

wide-scale deployments of BPL systems, a regional deployment model for BPL networks is proposed herein.

The model characterizes the number and distribution of active BPL

devices across the entire United States. Among other things, the results of this model will be used to characterize the effect BPL systems have on distant federal communication systems due to any increase in background noise level as a result of ionospheric propagation of unintentional BPL radiated emissions. This will also help address concerns that other countries may have with deployment of BPL systems in the United States.

Page B2 shows links to videos of countries testing BPL

OVSV /

Austria Video Showing Effect of PLC in Tirol, Austria

AUSTRIA:  During an emergency exercise of the Austrian

Red Cross in May 2003, communication was massively disturbed by PLC, with interference levels exceeding the limits by a factor 10,000.

___________________

FINLAND:

In October 2001, FICORA measured disturbance levels in the PLC test network in a residential area. The measurements revealed that data transmission caused a significant rise in disturbance levels inside buildings, and outside near buildings and underground cables. The measured levels were significantly higher than NB30.

___________________

“On Radio Interference Assessments of Access PLC System,” JARL/Japan.

Measurements were conducted to evaluate the impact of overhead access PLC to the

amateur radio service and broadcasting service. Three cases were examined. First, the

S/N of an AM signal and SINAD of a CW carrier were measured, and the results showed

unacceptable degradation of HF broadcasting services from PLC interference. Second,

observation using a spectrum analyzer showed that the HF broadcasting signal was

completely jammed by the BPL modem operation. Third, measurement of the far-field

component showed that short wave radio was jammed by the PLC signal at 156 meters

away, and the PLC signal became undetectable at a distance of 200 to 400 meters. The

experiment concluded that access PLC systems jam HF broadcasting and other radio

communication services.

“Interference measurements in HF and UHF bands caused by extension of power line

communication bandwidth for astronomical purpose,” Japan. Two sets of modems,

spread spectrum and OFDM, of the access PLC system were tested for the interference

effect to radio astronomical observation. It was found that in the HF band, the PLC noise

exceeds the level of the galactic noise by more than 30 dB when the two systems were

180 meters apart. In the UHF band, spurious emission near 327 MHz was observed at a

55 meter distance. In both cases, the interference noise exceeds the limit in ITU-R Rec.

RA 769-1 for protection of radio astronomical observation. Safety separations to meet

RA 769-1 limit are estimated to be 219 km and 12 km at 9.2 MHz and 327 MHz,

respectively. The report concluded that PLC is harmful to radio astronomical observation in both the HF and UHF bands.

https://www.ntia.doc.gov/files/ntia/publications/ntia_bpl_report_04-413_volume_ii.pdf

 

 

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