"KØHB" wrote

While GWB calls for relaxing Part 15.....

There needs to be technical standards to make
possible new broadband technologies, such as the use of
high-speed communication directly over power lines. Power lines
were for electricity; power lines can be used for broadband
technology. So the technical standards need to be changed to
encourage that.

.....the NTIAyesterday (4/27/2004) released a paper which argues
AGAINST relaxing Part 15 (see below). Full NTIA report at
http://www.ntia.doc.gov/ntiahome/fcc...bpl/index.html


"Critical review of the assumptions underlying these analyses
revealed that application of existing Part 15 compliance
measurement procedures for BPL systems results in a significant
underestimation of peak field strength. Underestimation of the
actual peak field strength is the leading contributor to high
interference risks. As applied in current practice to BPL
systems, Part 15 measurement guidelines do not address unique
physical and electromagnetic characteristics of BPL radiated
emissions. Refining compliance measurement procedures for BPL
systems will not impede implementation of BPL technology because
BPL networks reportedly can be successfully implemented under
existing field strength limits.

"Accordingly, NTIA does NOT recommend that the FCC relax Part 15
field strength limits for BPL systems. Further based on studies
to date, NTIA recommends several "access" BPL compliance
measurement provisions that derive from existing Part 15
measurement guidelines. Among these are requirements to: use
measurement antenna heights near the height of power lines;
measure at a uniform distance of ten (10) meters from the BPL
device and power lines; and measure using a calibrated rod
antenna or a loop antenna in connection with appropriate factors
relating magnetic and electric field strength levels at
frequencies below 30 MHz."

Sunuvagun,

de Hans, K0HB