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#1
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Any interference is unwelcome, and if it can be prevented, then I say do it
! Why should anyone have to pay for new receivers or new equipment to compensate for problems caused by some large company who can bend and twist the law to their own advantage ? Why should anyone put up with this kind of bull crap ? Amateurs are held to strict limits on the amount of interference they can cause - why should any one put up with a big company's intereference, and what makes them less liable for preventing interference than hams ? I don't buy the argument about coherence. It is already no picnic listening to interference even if you do have a noise blanker or noise reduction circuit. We don't need more degradation of the signal. "Jim Nye" wrote in message ... The claim that BPL will seriously and negatively impact amateur radio is simply fear, uncertainty, and doubt (FUD) spread by the ARRL. That organization needs to justify its existence, and the BPL issue is a convenient way for it to show its activism. The ARRL has apparently followed the path of other self-justifying organizations such as NOW and the NAACP. Unfortunately, the technically unsophisticated do not recognize the difference between coherent and non-coherent noise, and this makes it easy for the ARRL to spread its FUD. But the fact is that, if BPL signals are heard at all, they are coherent (have a predictable phase and amplitude) and therefore can be completely removed at the receiver. This can be done in many ways, most of which amount to nulling the BPL signals by introducing an identical signal which is 180 degrees out of phase with the original. As a matter of fact, most current HF transceivers have what they call a "noise reduction" option already built into them which uses the nulling method to accomplish its goal. Therefore, many amateurs and SWLers already have the needed equipment to deal with any BPL "interference." The ARRL reports have conveniently omitted any mention of the coherency issue, and their measurements are therefore flawed, because they don't reflect real world situations. So take the ARRL claims with a large grain of salt, and don't succumb to the FUD they are spreading. Instead, do some reading on your own by going to non-ARRL web pages such as http://www.uplc.utc.org, and http://www.wave-report.com/tutorials/bpl.htm before accepting the ARRL claims at face value. |
#3
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Jim Nye wrote:
The claim that BPL will seriously and negatively impact amateur radio is simply fear, uncertainty, and doubt (FUD) spread by the ARRL. That organization needs to justify its existence, and the BPL issue is a convenient way for it to show its activism. The ARRL has apparently followed the path of other self-justifying organizations such as NOW and the NAACP. Unfortunately, the technically unsophisticated do not recognize the difference between coherent and non-coherent noise, and this makes it easy for the ARRL to spread its FUD. But the fact is that, if BPL signals are heard at all, they are coherent (have a predictable phase and amplitude) and therefore can be completely removed at the receiver. This can be done in many ways, most of which amount to nulling the BPL signals by introducing an identical signal which is 180 degrees out of phase with the original. As a matter of fact, most current HF transceivers have what they call a "noise reduction" option already built into them which uses the nulling method to accomplish its goal. Therefore, many amateurs and SWLers already have the needed equipment to deal with any BPL "interference." The ARRL reports have conveniently omitted any mention of the coherency issue, and their measurements are therefore flawed, because they don't reflect real world situations. So take the ARRL claims with a large grain of salt, and don't succumb to the FUD they are spreading. Instead, do some reading on your own by going to non-ARRL web pages such as http://www.uplc.utc.org, and http://www.wave-report.com/tutorials/bpl.htm before accepting the ARRL claims at face value. Noise is noise. The "noise blanker" switches in 80s tabletops were meant for the Soviet "woodpecker" radar and probably won't work for BPL. Besides, BPL is so loud that it could easily overtake noise blanker switches. It's the equivalent to jamming all of HF-which, if you're conspiracy minded, may or may not be one of the goals. Oh, and as for noise blankers, portables don't have them. |
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