I initially had 50 feet of RG-58/U going to my GPS antenna. The loss was likely around 12 dB. That cable eventually failed, and all I had was a 100 foot length of the same type of cable, and surprisingly the GPSDO still worked ok. Recently I purchased a 35 foot length of 3/8th inch hardline with factory-installed N connectors on eBay for $40. The loss should be less then 2 dB. Obviously it works, but I cannot tell that the 10 dB reduced loss from the original cable made any difference. Rob, NC0B
Sent from my iPad > On Dec 6, 2015, at 7:00 AM, "David J Taylor" <david-tay...@blueyonder.co.uk> > wrote: > > > > Bert, > > Extending the RG-6U using N-connectors should not be giving you more > than 0.20 dB, probably less. Considering that you have have 6.12 dB per > 100 feet in RG-6U at 1 GHz (should be about 8 dB @ 1.575 GHz), so it > will be more. Using N-connectors to extend the cable-stretch isn't going > to be a major issue, it may be the cable length that could present an issue. > [] > Cheers, > Magnus > ============================= > > From: Bert Kehren via time-nuts > > Thank you all for the information, worse case I look at 70 feet with two > couplings all in an inaccessible attic. The cable is quality but vintage > 1989. Part of an extensive cable TV wiring. So far nine with two I am not > able > to locate the other end.The way they are installed I am not able yet to use > one of them to pull a new one in. > Twenty years ago I probably would have risked crawling in there. Don't want > to fall 16 feet at age 73. > Bert Kehren Palm City . > ============================ > > Magnus, > > RG-6U is 75-ohm cable and uses type F connectors (horrible!). Any F-N > adapters and the impedance mismatch would surely introduce more loss than a > simple Female-Female F connector. > > Bert, > > If the cable is that old, 1989, I would consider replacing it with a more > recently purchased cable, which will not have deteriorated, and may have > lower loss. I appreciate that may not be possible in your case. > > Cheers, > David > -- > SatSignal Software - Quality software written to your requirements > Web: http://www.satsignal.eu > Email: david-tay...@blueyonder.co.uk > Twitter: @gm8arv > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > > -- > If this email is spam, report it to > https://support.onlymyemail.com/view/report_spam/ODExMjI6MTgzMTgxMzk0Nzpyb2JAbmMwYi5jb206ZGVsaXZlcmVk > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.