Sounds like an application just calling for "hard line". I have some 75 foot lengths of 1/4" Superflex that I'll have to drag out and look at.
73, Dick, W1KSZ -----Original Message----- >From: Mark Sims <[EMAIL PROTECTED]> >Sent: Jun 13, 2008 5:37 PM >To: [email protected] >Subject: [time-nuts] Non-impedance matched antenna cables > > >A while back I did a project that used a 100 foot piece of (supposedly) fairly >good quality RG58. I checked it with my TDR and then installed it in an >outdoor application where it ran for a couple of weeks in good ole' Texas >weather. The outdoor connection was covered by a glass jar so water >infiltration of the connector was not an issue. Also the cable was not >hanging, so stretching under its own weight was probably not an issue. > >When the project was then over I happened to check the cable with the same >TDR. Its effective electrical length had changed by around a foot! A >half-wave of GPS is around 4 inches. I think that most commercial coax is way >too unstable to maintain that kind of precision in a real-world installation. >A .2% shift in velocity factor or cable length in a typical 100 foot run would >be 1/4 wave of GPS signal. > >> ---------------------------------------- >> >Depends on the cable length and the temperature excursions it experiences. >For short runs its well worthwhile. >For longer runs the cable attenuation will help reduce the effect of >mismatches at either end. > >_________________________________________________________________ >Instantly invite friends from Facebook and other social networks to join you >on Windows Live™ Messenger. >https://www.invite2messenger.net/im/?source=TXT_EML_WLH_InviteFriends >_______________________________________________ >time-nuts mailing list -- [email protected] >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
