Amen brother tell it! Tom Cokenias T.N. Cokenias Consulting P.O. Box 1086 El Granada CA 94018 Tel 650 726-1263 Cell 650 302-0887
Sent from my iPhone On May 18, 2010, at 7:19 PM, "o. laney" <[email protected]> wrote: Why do you assert that government users are not concerned? They are very concerned, do studies, publish papers, and hold conferences. However, public safety and defense concerns are not usually for public consumption. My government contacts who conduct field studies tell me that even NATO is concerned, the problem being that the aggregate transmitting power on miles of radiating lines is enough to be detectable after ionospheric bounce. We're talking very large distances. By any measure, BPL/PLC in the HF band is dung. BPL was conceived by businessmen who don't know coax from garden hose, implemented politically on the business side and by engineers they pay but don't listen to on the technical side. Among other critical services in the HF band there are long distance aircraft and maritime communications, research telemetry, and all sorts of other things that depend on reliable reception of weak signals. These are scattered all through the HF band, and notching the hams is politically expedient but no protection for these other users. Believe me, the FCC is in the loop on this, but Michael Powell rammed approval down the throats of staff. He's a lawyer, and science be damned. Now shut up about the hams. They have sound science behind them and the technical problems cannot be finessed away. You do understand, I hope, that notching means in-band energy reduction, but not elimination. It helps but is not a panacea by any stretch of the imagination. And yes, the hams are well regarded for their ability to provide emergency communications. The amateur service is predicated on such capability along with advancement of the technical art, and not simply as an indulgence for hobbyists. Orin Laney On Tue, 18 May 2010 15:59:43 -0500 Mark Gandler < <mailto:[email protected]> [email protected]> writes: Unfortunately, hams complaining about anything and everything related to BPL, even small home Ethernet adapters, which are notched, signals are lower power and they get significantly reduced power beyond any circuit breaker. And those products are easier targets, as there are more of them around, they are on store shelves and fall under EMC Directive. and why are the majority of the complaints come from UK? BPL has much higher sales in Germany and France. As well we are not getting any complaints from any government operations. If hams will be the only ones with communication devices left during the disaster, please make sure to post your addresses, so we can all flock to it, I am not joking. ________________________________ From: <mailto:[email protected]> [email protected] To: [email protected]; - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to < <mailto:[email protected]> [email protected]> All emc-pstc postings are archived and searchable on the web at <http://www.ieeecommunities.org/emc-pstc> http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: <http://www.ieee-pses.org/> http://www.ieee-pses.org/ Instructions: <http://listserv.ieee.org/request/user-guide.html> http://listserv.ieee.org/request/user-guide.html List rules: <http://www.ieee-pses.org/listrules.html> http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas < <mailto:[email protected]> [email protected]> Mike Cantwell < <mailto:[email protected]> [email protected]> For policy questions, send mail to: Jim Bacher < <mailto:[email protected]> [email protected]> David Heald < <mailto:[email protected]> [email protected]> - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]>
