Hi Urs, I'm also puzzled by this.
Since the EW flight recorder is an IGC approved device, it meets the IGC specification and therefore any cable wired to this spec should work, whether it was designed specifically for EW or for any other IGC approved Flight Recorder. As you correctly say, it is an IGC requirement that pins 1-2 and 7-8 are paralleled - the reason as I recall it is for compatibility between 6 and 8 pin RJ plugs. If it is true that this paralleling defeats the reverse polarity protection in the EW then it follow that EW has in effect got NO reverse polarity protection, because all cables created to the IGC spec are the same. The alternative explanation is that supplied EW cables don't have this parallel wiring and therefore don't conform to the IGC spec. Cheers Tim -----Original Message----- From: aus-soaring-boun...@lists.internode.on.net [mailto:aus-soaring-boun...@lists.internode.on.net] On Behalf Of Urs Rothacher Sent: Thursday, 20 May 2010 17:04 To: 'Discussion of issues relating to Soaring in Australia.' Subject: Re: [Aus-soaring] TECHNICAL ALERT 1) IGC Flight Recorder specifications require pin 1&2 and pin 7&8 on the RJ-45 connector of a IGC compliant cable to be in parallel... http://www.fai.org/gliding/system/files/tech_spec_gnss.pdf#page=32 2) There is no such thing as a "FLARM cable" or "FLARM connector". FLARM has never shipped any assembled cables. Am I missing something? Urs FLARM -----Original Message----- From: aus-soaring-boun...@lists.internode.on.net [mailto:aus-soaring-boun...@lists.internode.on.net] On Behalf Of Mike Borgelt Sent: Mittwoch, 19. Mai 2010 18:43 To: Discussion of issues relating to Soaring in Australia. Subject: Re: [Aus-soaring] TECHNICAL ALERT Those of using EWMicrorecorders should be very careful to NEVER plug a FLARM connector into the EW by mistake. The EW has built in reverse polarity protection but the FLARM cable by paralleling pins 1 and 2 and pins 7 and 8 on the connector defeats this. Take care! Damage by this method constitutes misuse and is not covered by warranty. The damage is quite distinctive. Mike Borgelt Instruments - manufacturers of quality soaring instruments since 1978 phone Int'l + 61 746 355784 fax Int'l + 61 746 358796 cellphone Int'l + 61 428 355784 email: mborg...@borgeltinstruments.com website: www.borgeltinstruments.com _______________________________________________ Aus-soaring mailing list Aus-soaring@lists.internode.on.net To check or change subscription details, visit: http://lists.internode.on.net/mailman/listinfo/aus-soaring _______________________________________________ Aus-soaring mailing list Aus-soaring@lists.internode.on.net To check or change subscription details, visit: http://lists.internode.on.net/mailman/listinfo/aus-soaring No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.819 / Virus Database: 271.1.1/2862 - Release Date: 05/20/10 04:26:00 _______________________________________________ Aus-soaring mailing list Aus-soaring@lists.internode.on.net To check or change subscription details, visit: http://lists.internode.on.net/mailman/listinfo/aus-soaring
