Re: [Repeater-Builder] Re: Mastr II mods and parts
Heliax for the transmission line. Superflex heliax for jumpers. RG-400 (not LMR-400, there is a huge difference) can be used for short jumper runs. RG-400 has a brown Teflon jacket and two layers of silver-plated braid. There are other cables that are acceptable, but these are my favorites. Chuck WB2EDV - Original Message - From: Michael H. Cox To: Repeater-Builder@yahoogroups.com Sent: Monday, January 04, 2010 12:41 AM Subject: Re: [Repeater-Builder] Re: Mastr II mods and parts What cable do you guys recommend? Thanks, Michael H. Cox michaelh...@gmail.com
Re: [Repeater-Builder] Re: Mastr II mods and parts
In case you haven't been to this site, there is more reading than you can shake a stick at regarding repeaters: http://www.repeater-builder.com/rbtip/ Chuck WB2EDV - Original Message - From: Michael H. Cox To: Repeater-Builder@yahoogroups.com Sent: Monday, January 04, 2010 12:41 AM Subject: Re: [Repeater-Builder] Re: Mastr II mods and parts What cable do you guys recommend? Thanks, Michael H. Cox michaelh...@gmail.com
Re: [Repeater-Builder] Re: Mastr II mods and parts
At 1/3/2010 21:54, you wrote: For connection between duplexer and radios I like 1/4 Superflex, but RG400 or RG142 is also great. To a duplex antenna for short runs those same cables could be used, keeping loss figures in mind. Otherwise appropriately sized Heliax or equivalent cables should be used. RG214 is the best choice for hardline-to-antenna jumpers. I also use is for the duplexer-to-radio cables unless I need more flexibility, in which case I use RG223. Bob NO6B
[Repeater-Builder] Re: Mastr II mods and parts
I totally agree with that Bob. I believe the dissimilar metal *thing* has far less to do with generating noise and PIM, than the simple fact that we have separate wires and elements constructing the shield that have very bad electrical connections with each other. Aluminum is known to always form a non-conducting oxide on it when exposed to air. Non-silver plated copper braid wires can have the same problem, though not quite as readily if kept dry. In any case, there are thousands of potential diode mixers per foot of cable. I too, use only silver-plated braid or solid copper such as Superflex. I'll never forget the piece of RG213 that I once had feeding a repeater antenna that easily generated noise when taken in hand and flexed. I say all the good luck to those that successfully use 9913 and similar cables in duplex service. I'll use cables that are virtually certain to *not* generate duplex noise in my installations. Laryn K8TVZ BTW, they don't need to be dissemilar metals. I once confirmed a 100% copper braided RG-213 jumper as a PIM source. I only use silver-plated braided coax beyond the duplexer from now on. Bob NO6B
Re: [Repeater-Builder] Re: Mastr II mods and parts
What cable do you guys recommend? Thanks, Michael H. Cox michaelh...@gmail.com -Original Message- From: larynl2 lar...@hotmail.com Date: Mon, 04 Jan 2010 05:36:20 To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Mastr II mods and parts I totally agree with that Bob. I believe the dissimilar metal *thing* has far less to do with generating noise and PIM, than the simple fact that we have separate wires and elements constructing the shield that have very bad electrical connections with each other. Aluminum is known to always form a non-conducting oxide on it when exposed to air. Non-silver plated copper braid wires can have the same problem, though not quite as readily if kept dry. In any case, there are thousands of potential diode mixers per foot of cable. I too, use only silver-plated braid or solid copper such as Superflex. I'll never forget the piece of RG213 that I once had feeding a repeater antenna that easily generated noise when taken in hand and flexed. I say all the good luck to those that successfully use 9913 and similar cables in duplex service. I'll use cables that are virtually certain to *not* generate duplex noise in my installations. Laryn K8TVZ BTW, they don't need to be dissemilar metals. I once confirmed a 100% copper braided RG-213 jumper as a PIM source. I only use silver-plated braided coax beyond the duplexer from now on. Bob NO6B
[Repeater-Builder] Re: Mastr II mods and parts
For connection between duplexer and radios I like 1/4 Superflex, but RG400 or RG142 is also great. To a duplex antenna for short runs those same cables could be used, keeping loss figures in mind. Otherwise appropriately sized Heliax or equivalent cables should be used. Laryn K8TVZ --- In Repeater-Builder@yahoogroups.com, Michael H. Cox michaelh...@... wrote: What cable do you guys recommend? Thanks,
