From: "Arnold Tibus" <[EMAIL PROTECTED]> Subject: Re: [time-nuts] GPS failure... Date: Tue, 7 Feb 2006 22:47:59 +0100 (MET) Message-ID: <[EMAIL PROTECTED]>
> Hello Magnus, Hi Arnold, > was there no small hole on the lower side, underneath, > was it blocked by the little spider? No, the hole I think was intended for that purpose was hidden under the label giving away what manufacter and model-number it is. > Offshore working with meteorologic sensors and electronics, > I experienced personally that it is not a very good idea to build > antennas or other electronic devices into hermetic cases > without a breating hole in it (well protected against rain and > drops of water, possibly contain a filter device) unless the case > is not pressure cycling proof, including cables and connectors. I think this device had one designed. But I suspect it was put out of action by the label. :P > Due to temperature and air pressure changes, > these devices are breathing air with humidity via the connectors, > coaxial and other cables, which in colder phases is condensing > and remaining inside, that way filling up the box, drop per drop. Which is what I suspect this baby died off. > The 2nd way is to build a real pressure proof box with hermetic > feed through connectors (glass or ceramic insert, O-ring sealed), > capable to withstand more than 1 meter of water immersion. Well, yes. Thing is, I'm not building them, I am just trying to use one or two antennas. > Good luck and have fun, > > Arnold, DK2WT Thanks for the insight. It is along the lines of what I have a gut-feeling of, but it is good to get confirmation. Cheers, Magnus _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts