I did make one jumper using some RT142, with an RCA on one end, and an N on the other. Seemed to work okay. I still have that cable, I think, don't recall for sure. I used it with a Mastr II base from the RX port to a duplexer can. I did trim the insulation between the two shields so both layers were common at the nds. Would be nice to use some between the duplexer Tee and either a PolyPhaer or direct to 7/8" hardline. Desiring to keep as short as practical to keep losses down at 442 MHz. I hate trying to use junk cable. The duplexer has what looks to be RG142 for its jumpers.
I bought the cable thinking it was the same as RG142. Wayne WA2YNE On Mon, 12 May 2008 22:20:14 -0500, Eric Lemmon <[EMAIL PROTECTED]> wrote: > Wayne, > > My contact at Times Microwave Systems advised me that "RT-142" is a > triaxial > cable in their "REMIT" specialty product line. The name refers to > "Reduced > Electro Magnetic Interference." Although Times does claim that "RT-142 > is > manufactured in accordance with the material requirements of MIL-C-17" > it is > not a QPL-listed product. Times will not mark the jacket unless > specially > requested by the customer. Here are the specs from the REMIT catalog > page: > > Inner Conductor - 0.039" SCCS > Dielectric OD - 0.116" > Dielectric Material - Not specified > Shield Braids - SC > Shield Coverage - Not specified > Jacket Material - FEP > Jacket OD - 0.215" > Nominal Impedance - 50 ohms > Nominal Capacitance - 29.4 pF/ft > Max Operating Voltage - 1,900 VRMS > Max Attenuation at 400 MHz - 9.0 dB/100 ft > Velocity of Propagation - Not specified > > If this cable is used in place of double-shielded coaxial cable such as > RG-400, the insulating barrier should be trimmed back from the connector > clamping or crimping area, so that there is positive metal-to-metal > contact > between the shields at both ends of the jumper. Care must be taken to > select connectors that fit the dielectric without slop; otherwise, a > significant "impedance bump" will occur at the cable/connector interface. > > 73, Eric Lemmon WB6FLY > > -----Original Message----- > From: [email protected] > [mailto:[EMAIL PROTECTED] On Behalf Of Wayne > Sent: Sunday, May 11, 2008 8:34 PM > To: [email protected] > Subject: Re: [Repeater-Builder] Best coax for short jumpers in repeater > cabinet? > > I have some cable that I cannot find the true information for. > it is labeled as follows: > 68999, TIMES MICROWAVE SYSTEMS, RT142 > It is not listed, at least not readily seen, on the Times microwave web > site. > It appears to be a version of RG142. > It is tan outer cover > Double shielded, high density silvered (or tinned) with insulation > between teh two shields.. > clear solid inner insulation, and stiff solid center conductor. > I bought it to use as RG142 for jumpers. > It looks virtually the same as some labeled RG142 that came with a > Micor > UHF duplexer, though less flexible than the RG142 seems to be. > I now wonder if it is interchangeabe or not? > I have never seen any cable labeled RT instead of RG... > > Wayne WA2YNE > -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
