Hi Ryan, For the few years I've been on time-nuts, I understood the consensus view to be to get a good quality RG-6QS satellite cable. A few of the posts in this thread have made me wonder if the consensus is changing, or if it's just too much trouble to stand up to the crowd. I've got about 300 ft of CerroWire RG-6QS leftover from Home Depot in the garage. I looked at the datasheet, and it's confusing. For the attenuation at 1000MHz, they list 21.45DB per hundred with the superscript "1". However there is nothing on the page noting whether that "1" means per 100 feet or per 100 meters. Looking at the competition it would appear that that's per meter. Unfortunately, I don't have the right connectors to hook it up to my SA to see. OTOH, 100 ft runs from this spool don't show any noticeable (i.e. problematic) attenuation of the signal. Maybe someone else with a spool of RG-6 in the garage could give use some real world attenuation figures at L1?
But, rather than over-engineering or over-angsting this issue, it's probably OK to just pick one and use it. It's not likely to make any real difference unless you have a run in the many hundreds of feet. Bob - AE6RV -------------------------------------------- On Fri, 4/22/16, Ryan Stasel <rsta...@uoregon.edu> wrote: Subject: Re: [time-nuts] RG6 or LMR400 for GPS Antenna (Symmetricom 58532A and T-bolt) To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Date: Friday, April 22, 2016, 4:09 PM Paul, LOL! So, along those lines… one other question, since I can’t find my belden, I’ll be buying some coax. Anyone have any opinions about RG6 for CCTV vs CATV? My understanding is the CCTV version always has a solid copper center conductor (which in my mind would mean less voltage loss for the DC power going to the antenna), or I’m still overthinking it and should just go with standard RG6? Thanks! -Ryan Stasel > On Apr 21, 2016, at 13:04 , paul swed <paulsw...@gmail.com> wrote: > > Ryan a slight heads up. > Time Nuts is not about time accuracy as many people assume. > Its actually about the time we all waste looking for what we know we have. > We just measure that time accurately. > I do not use anti seize. Nothing against it just one more glob of stuff to > deal with. > If you use the heat shrink and it seals your done for my 2 cents. > Paul > WB8TSL > > On Thu, Apr 21, 2016 at 1:07 PM, Ryan Stasel <rsta...@uoregon.edu> wrote: > >> All, >> >> Really awesome answers, thanks! >> >> For the sealing question, it was more of a “should I bother with something >> like anti-seize” or the like on the actual thread-thread N interface. The >> actual connector crimp, was planning on just using a couple layers of the >> heat-shrink with adhesive. That is all going to be internal to the mast >> anyway, so direct weather contact should be minimal. It’s also on the side >> of my chimney, that gets very little to no direct sun, so UV exposure >> should be minimal. But good note on that regard. >> >> Pete, thank you very much for the info wrt the antenna and amp, and also >> the fact the Trimble starter kit came with RG6. I’m going to see what my >> seller wants for LMR400, but otherwise, I’ll just use RG6. It’s certainly >> easier to handle. I did find some datasheets on the stuff that Home despot >> (har har) sells (Southwire ( >> http://www.southwire.com/ProductCatalog/XTEInterfaceServlet?contentKey=prodcatsheetOEM80)). >> I swear I have a box of Belden somewhere, but I can’t seem to find it. >> >> Thanks again! >> >> -Ryan Stasel >> >>> On Apr 21, 2016, at 06:02 , paul swed <paulsw...@gmail.com> wrote: >>> >>> With respect to sealing. Everyone has a method. >>> I use what I learned in the Navy. I could see how well the connections >> held >>> up in the worst conditions sun cold heat wet humidity... >>> Layer of rubber tape >>> scotch kote >>> Layer of plastic tape >>> scotch kote >>> If done well the connector releases just fine even after 5 or more >> years. I >>> want to say 10. But then woodpeckers have a way of shortening the life of >>> connectors and coax. >>> The approach is really layers and the top to deteriorate over time... >>> But as I say everyone has their own approach. >>> Regards >>> Paul >>> WB8TSL >>> >>> On Wed, Apr 20, 2016 at 9:03 PM, Ryan Stasel <rsta...@uoregon.edu> >> wrote: >>> >>>> Bob/Paul, >>>> >>>> Thanks. And there's the rub... Who knows what the specs are on "generic" >>>> RG6 QS. I'll see what my seller wants for their LMR400, but otherwise >> yeah, >>>> RG6 is just easier. I have both compression and crimp connectors for it, >>>> including some RG6 N-connectors (yeah, they're probably for LMR300, but >>>> they work). >>>> >>>> Other question: any tips for the exterior N connection? I can >>>> "weatherproof" the actual cable-connector crimp, but I'm curious if >> anyone >>>> bothers to "lube" the N connector to keep moisture from otherwise >> seizing >>>> it up. >>>> >>>> Thanks! >>>> >>>> Ryan Stasel >>>> IT Operations Manager, SOJC >>>> University of Oregon >>>> >>>> Sent from my iPhone >>>> >>>>> On Apr 20, 2016, at 17:00, Bob Camp <kb...@n1k.org> wrote: >>>>> >>>>> Hi >>>>> >>>>> RG-6 Quad Shield should be fine as long as it’s meeting the published >>>> specs. The advantage of LRM-400 is that you likely *know* where it came >>>> from and what the specs are. >>>>> >>>>> If you decide to split the antenna between GPSDO’s, a powered splitter >>>> is a really good idea. Each time you split another 2 ways, you loose 3 >> db. >>>> Get at least a 4 way splitter …. >>>>> >>>>> Bob >>>>> >>>>>> On Apr 20, 2016, at 4:41 PM, Ryan Stasel <rsta...@uoregon.edu> wrote: >>>>>> >>>>>> All, >>>>>> >>>>>> I’m going to be installing a “permanent” antenna at home, and will >> need >>>> a run of about 100ft to get from my workstation, to the mast I’ll be >>>> mounting the antenna on (Symmetricom 58532A). I’ve seen some indication >>>> that both the antenna and the Trimble Thunderbolt won’t have any issues >>>> with running over 75ohm cable, but thought I’d ask the “experts” whether >>>> I’d be better off with some RG6 Quad-shield, or LMR400 (I’ve got a local >>>> source that doesn’t know what LMR400 is, or what it’s worth)? >>>>>> >>>>>> Obviously I’d prefer to run and crimp RG6, but if I’d be better off >>>> with LMR400, I’d rather run that now than go back into the crawlspace >>>> again. =) >>>>>> >>>>>> Also, if it helps, I’ll probably have a Symmetricom/HP 58516A at/near >>>> the T-bolt so I can experiment with other GPS(DO)s as well (especially >> one >>>> of the JRMiller boards I bought and built (but never finished) ages >> ago). >>>> Which brings the question, will the T-bolt provide the oomph needed to >>>> power that splitter and the antenna over that length of cable? >>>>>> >>>>>> Thanks! >>>>>> >>>>>> -Ryan Stasel >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> 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. >>>>> >>>>> _______________________________________________ >>>>> 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. >>>> _______________________________________________ >>>> 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. >>>> >>> _______________________________________________ >>> 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. >> >> _______________________________________________ >> 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. >> > _______________________________________________ > 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. _______________________________________________ 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. _______________________________________________ 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.
