What about LDF4-50A coax cable? Is it a better choice than FSJ4-50B? Howard
--- In Repeater-Builder@yahoogroups.com, "Jeff DePolo" <[EMAIL PROTECTED]> wrote: > > > I think this is, or should be, a repeater-builder FAQ. > > Foil+braid cables like 9913, LMR-series, etc. should generally NOT be used > in duplex environments. Although a few may report results to the contrary, > braid-over-foil cables produce noise due to the dissimilar metal contact, > particularly as the cable ages/weathers. As such, they should be avoided. > > Double-silver-shield cables such as RG-142B/U or RG-400/U are RG58- sized > cables good for short runs at UHF and below. Their use at 900 or above > should be kept to very short lengths and/or power levels under 100 watts due > to the losses involved. RG-393 is slightly smaller in diameter than RG8 and > is constructed using dual silver braids like RG-142B/U and RG- 400/U, so it > is good choice for longer runs and/or higher power levels. RG214/U is also > a good choice except at very high power levels as, unlike the others cited > above, it has a solid polyethylene dielectric instead of teflon. RG-223 is > a smaller version of RG-214, again with a double silver braid and poly > dielectric. Be careful when ordering RG-214's. There are "commercial" > grades of RG-214, as compared to mil-C17 types, which have bare copper > braids instead of silver plated. Bare copper braids, even if > double-shielded, should be avoided for the same noise-generating reasons as > in the case with foil+braid cables. > > Solid-shield cable such as Superflex-type Heliax (FSJ1-50A 1/4", FSJ2-50A > 3/8", FSJ4-50B 1/2") is the best in terms of both loss-versus- size, lack of > duplex noise, and shielding properties. > > Hope this helps. > > --- Jeff > > > -----Original Message----- > > From: Repeater-Builder@yahoogroups.com > > [mailto:[EMAIL PROTECTED] On Behalf Of Howard Z. > > Sent: Wednesday, June 06, 2007 5:13 PM > > To: Repeater-Builder@yahoogroups.com > > Subject: [Repeater-Builder] Which coax cables to use with repeaters? > > > > I have read that one should use dual-shielded cables. > > > > Which cables are these? > > > > Is Belden 9913F7 a good choice? > > > > Here is its description: http://www.therfc.com/9913f.htm > > > > > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > No virus found in this incoming message. > > Checked by AVG Free Edition. > > Version: 7.5.472 / Virus Database: 269.8.11/837 - Release > > Date: 6/6/2007 2:03 PM > > > > >
