Amund, Thanks for the information. I can understand and appreciate the importance of that on ocean going vessels. However, I don't mean to be cynical, but is a bass boat considered to have what equates to a bridge on a cruise ship or ocean liner?
After all, this is a bass boat used on a small lake with one VHF radio. Kind Regards, Sam Wismer Engineering Manager ACS, Inc. *Tel: (770) 831-8048 *Fax: (770) 831-8598 *Web: www.acstestlab.com *swis...@acstestlab.com From: am...@westin-emission.no [mailto:am...@westin-emission.no] Sent: Thursday, September 18, 2003 3:08 PM To: Sam Wismer; EMC 2 Subject: SV: EN 60945 Hi Sam, Quote IEC60945: "This standard specifies minimum performance requirements, methods of testing and required test results for general requirements which can be applied to those characteristics common to all equipment described hereunder: a) shipborne radio equipment ............. b) shipborne navigational equipment ........... c) for EMC only, all other bridge-mounted equipment, equipment in close proximity to receiving antennas, and equipment capable of interfering with safe navigation of the ship and with radio-communications (see IMO Resolution A.813)". So, it seems that the EMC part of IEC60945 applies to all equipment installed on the bridge. The special case regarding EMC is that the radiated emission limit within the band 156-165MHz is 24dBuV/m @ 3m distance. Quote IEC60945: "Above 30 MHz all ships carry a VHF receiver operating in the band 156 MHz - 165 MHz. For the VHF band IMO requires a receiver sensitivity of 2 ?V e.m.f which equates to a field strength of 3 ?V/m at the antenna. For a typical separation of 15 m between the bridge and the VHF antenna, the free-space field strength at 3 m is 15 ?V/m (23,5 dBV/m) to give 3 ?V/m at the antenna, so a tighter limit is a requirement for operation of VHF communications (figure 4)". Amund Fra: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]Pa vegne av Sam Wismer Sendt: 18. september 2003 20:26 Til: EMC 2 Emne: EN 60945 Hello Group, Been a while.. Hope all has been well with everyone. I have a client who manufactures fish locating equipment designed to be used on recreational vessels such as your standard bass boat. My client has been getting his equipment tested to EN 60945 because it used in the vicinity of navigational equipment that is required to be on the craft, such as the VHF radio. On a bass boat used in the local lake, that is about the extent of the navigational equipment on the boat. It is my opinion that EN 60945 is a bit extreme for this equipment, in this environment - the local lake. Also since his equipment is not navigational equipment, EN 60945 should not even apply. His or his previous labs, reasoning, for applying EN 60945, was that since it was in the vicinity of navigational equipment, it should apply. Any comments? Thanks Kind Regards, Sam Wismer This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
