Thanks, Jim. Many of us will benefit from your thoughts. When the time comes to make a permanent installation with the KXPA100, I'll be sure and re-read your email.
I already have the KX3 set up in the mobile. It is working fine, but antenna efficiency isn't very good with the Hustler type. The amp will give a good boost to output. Receiving is already pretty good due to the KX3's performance. 73, matt W6NIA On Sun, 12 Jan 2014 10:57:14 -0800, you wrote: >On 1/12/2014 10:26 AM, Matt Zilmer wrote: >> Wiring to the >> KXPA100 is 8 AWG, with two "transfers" to APPs at a relay enclosure >> for power control in the trunk. The source is the Civic's battery. >> The KXPA is located in the trunk. > >Several thoughts about this. First, noise pickup on the power wiring >will be greatly reduced by making it twisted pair. Second, unless the >SWR is REALLY high, much less power will be lost in coax than in the DC >wiring. Third, ALL of this wiring should have common mode chokes on it >to further minimize noise pickup and RFI. > >My strategy would be to locate the amp based on convenience, on making >the DC cable shorter, and on the practicality of paths for routing the >needed wiring. > >I would use the best quality coax I could fit into the available wiring >routes. This is an application for the best quality transmitting coax >with a heavy copper braid shield. Remember that the shielding provided >by coax depends upon a shield that has very low resistance and very good >uniformity. Belden 9258 would be a great choice -- it's a RG8X form >factor (0.242-in o.d.), with #16 stranded copper center and a 95% copper >braid shield. > >Finally, there is probably little benefit to bonding the radio or the >amp to the frame of the vehicle. Thanks to the excessive application of >paint and the use of lots of non-metallic parts, chassis bonding of >modern vehicles is flaky at best, and a train wreck at worst (it is in >my 2006 Toyota big SUV). Indeed, one of the major challenges in a modern >vehicle is finding enough conductive structure to form a counterpoise >for an HF antenna. > >73, Jim K9YC >______________________________________________________________ >Elecraft mailing list >Home: http://mailman.qth.net/mailman/listinfo/elecraft >Help: http://mailman.qth.net/mmfaq.htm >Post: mailto:Elecraft@mailman.qth.net > >This list hosted by: http://www.qsl.net >Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
