RG142/U cable is used all the time in duplexers. Extreme care is required to ensure that the silver/copper plating is not scratched or nicked when the connectors are put on and the pins on the center conductor needs to be soldered.
The better cable should be used where the RX and TX signals are present first and then on the transmitter side so that noise generation is minimized. --- In Repeater-Builder@yahoogroups.com, Larry Horlick <llhorl...@...> wrote: > > So in a "duplex" application, if the supply of the better cable is limited, > it's better to use it on the rx side? > > On Sun, Mar 7, 2010 at 6:42 PM, Dan Saputo <dan17...@...> wrote: > > > > > > > "Real" as it refers to the original military-spec'd construction of the > > cable. "Type" meaning similar to original spec but likely not exact. > > common differences in "Type" cable might be tinned vs. silver plated > > conductors, dialectric material etc. > > > > Spec RG-142 has a silver-plated steel center conductor. repeated flexing > > can cause the thin plating to fracture off creating duplex noise. i've > > personally not had this problem but it is a documented issue. > > > > Dan > > k8plw > > > > --- On *Sun, 3/7/10, Larry Horlick <llhorl...@...>* wrote: > > > > > > From: Larry Horlick <llhorl...@...> > > Subject: Re: [Repeater-Builder] Re: LMR Cable > > To: Repeater-Builder@yahoogroups.com > > Date: Sunday, March 7, 2010, 6:24 PM > > > > > > What is the difference between real and un-real RG214? And what is the > > problem with RG-142? > > > > lh > > > > On Sun, Mar 7, 2010 at 6:24 PM, NORM KNAPP <nkn...@twowayradio. > > net<http://us.mc560.mail.yahoo.com/mc/compose?to=nkn...@...> > > > wrote: > > > >> > >> Those are usually the preferred types of cables. You should have no > >> problems with either of those. I prefer REAL RG214/U., but RG400/U, RG393 > >> or > >> RG223/U will work. Avoid RG-142 and RG-9/U. Superflex is also a good > >> choice. > >> Don't even think about any LMR type or > >> similar. > >> N5NPO Norm > >> > >> ----- Original Message ----- > >> From: Repeater-Builder@ yahoogroups. > >> com<http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com><Repeater-Builder@ > >> yahoogroups. > >> com<http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com>> > >> > >> To: Repeater-Builder@ yahoogroups. > >> com<http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com><Repeater-Builder@ > >> yahoogroups. > >> com<http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com>> > >> > >> Sent: Sun Mar 07 16:54:30 2010 > >> Subject: Re: [Repeater-Builder] Re: LMR Cable > >> > >> > >> > >> Any problems with RG-214 or RG223 for duplexers/multi- couplers/ > >> combiners? > >> > >> lh > >> > >> > >> On Sun, Mar 7, 2010 at 5:50 PM, Dan Saputo <dan17...@yahoo. > >> com<http://us.mc560.mail.yahoo.com/mc/compose?to=dan173mi%40yahoo.com><mailto:dan17...@yahoo. > >> com <http://us.mc560.mail.yahoo.com/mc/compose?to=dan173mi%40yahoo.com>> > >> > wrote: > >> > >> > >> > >> > >> well-documented and caused mainly by the use of foil shielding as in the > >> lmr series. gets worse as cable ages and internal braid-foil contact > >> degrades. Although not as big of a problem with lmr due to an insulating > >> layer over the actual foil. beware of belden 9913 and lmr look-alikes. > >> trouble when used duplex. > >> > >> Dan > >> k8plw > >> > >> --- On Sun, 3/7/10, Chuck Kelsey <wb2...@roadrunner. > >> com<http://us.mc560.mail.yahoo.com/mc/compose?to=wb2edv%40roadrunner.com><mailto:wb2...@roadrunner. > >> com<http://us.mc560.mail.yahoo.com/mc/compose?to=wb2edv%40roadrunner.com>> > >> > wrote: > >> > >> > >> > >> From: Chuck Kelsey <wb2...@roadrunner. > >> com<http://us.mc560.mail.yahoo.com/mc/compose?to=wb2edv%40roadrunner.com><mailto:wb2...@roadrunner. > >> com<http://us.mc560.mail.yahoo.com/mc/compose?to=wb2edv%40roadrunner.com>> > >> > > >> Subject: Re: [Repeater-Builder] Re: LMR Cable > >> To: Repeater-Builder@ yahoogroups. > >> com<http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com><mailto:Repeater-Builder@ > >> yahoogroups. > >> com<http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com>> > >> > >> Date: Sunday, March 7, 2010, 4:56 PM > >> > >> > >> > >> Passive Intermod. In other words, it tends to be a source in which > >> intermod > >> can be generated easily. > >> > >> Chuck > >> WB2EDV > >> > >> ----- Original Message ----- > >> From: "rffun" <radio...@her. forthnet. gr <http://us.mc560. mail.yahoo. > >> com/mc/compose? to=radiocom% 40her.forthnet. > >> gr<http://us.mc560.mail.yahoo.com/mc/compose?to=radiocom%40her.forthnet.gr>> > >> > > >> To: <Repeater-Builder@ yahoogroups. com <http://us.mc560. mail.yahoo. > >> com/mc/compose? to=Repeater- Builder%40yahoog > >> roups.com<http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com>> > >> > > >> Sent: Sunday, March 07, 2010 3:33 PM > >> Subject: [Repeater-Builder] Re: LMR Cable > >> > >> > <LMR and similar cables are not rated for low PIM> > >> > What exactly do you mean by PIM ? > >> > rffun > >> > > >> > --- In Repeater-Builder@ yahoogroups. com <http://us.mc560. mail.yahoo. > >> com/mc/compose? to=Repeater- Builder%40yahoog > >> roups.com<http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com>> > >> , Larry Horlick <llhorlick@ ..> > >> > wrote: > >> >> > >> >> Indeed. I'll read the archives. Thanks. > >> >> > >> >> 73 > >> >> > >> >> On Sun, Feb 28, 2010 at 8:59 PM, Chuck Kelsey <wb2edv@> wrote: > >> >> > >> >> > > >> >> > > >> >> > The subject comes up on this list about every other week. I can only > >> >> > assume > >> >> > you are new. > >> >> > > >> >> > LMR and similar cables are not rated for low PIM, a fact verified by > >> >> > the > >> >> > manufacturer. > >> >> > > >> >> > Chuck > >> >> > WB2EDV > >> >> > > >> >> > > >> >> > > >> >> > ----- Original Message ----- > >> >> > *From:* Larry Horlick <llhorlick@ ..> > >> >> > *To:* Repeater-Builder@ yahoogroups. com <http://us.mc560. > >> mail.yahoo. com/mc/compose? to=Repeater- Builder%40yahoog > >> roups.com<http://us.mc560.mail.yahoo.com/mc/compose?to=Repeater-Builder%40yahoogroups.com>> > >> > >> >> > *Sent:* Sunday, February 28, 2010 8:49 PM > >> >> > *Subject:* Re: [Repeater-Builder] Micor Stock Power Supplies > >> >> > > >> >> > I've never heard of it. As an installer, I'm always under pressure to > >> > >> >> > use > >> >> > less expensive feedlines than the venerable Heliax, and I had often > >> >> > considered LMR, but never actually succumbed to the temptation. This > >> is > >> >> > interesting information. Is this a well documented phenomenon? > >> >> > > >> >> > Anyone else like to chime in on this... > >> >> > > >> >> > Larry > >> >> > > >> >> > > >> >> > > >> >> > > >> >> > > >> >> > >> > > >> > > >> > > >> > > >> > ------------ --------- --------- ------ > >> > > >> > > >> > > >> > Yahoo! Groups Links > >> > > >> > > >> > > >> > >> ------------ --------- --------- --------- --------- --------- - > >> > >> No virus found in this incoming message. > >> Checked by AVG - www.avg.com > >> Version: 9.0.733 / Virus Database: 271.1.1/2728 - Release Date: 03/07/10 > >> 02:34:00 > >> > >> > >> > >> > >> > >> > >> > >> > >> > > > > > > >
