While in the midst of a inner station rebuild. SO2R All patch cables
Radio/BPF/AMP/6X2 and then the common ground coax BUSS bar are made up of
Mil-SPC-RG400 Double silver shielded Teflon dielectric and cover.
Wayne W3EA
> On Fri,12/26/2014 7:34 AM, Rich Hallman - N7TR wrote:
> > Looking to see if good quality RG213 / RG8 (95-98% shield) is ok past the
> > amps to the high power 4O3A filters or should I use something like LMR400 /
> > BuryFlex for those connections to keep down the potential inter-station
> > interference?
>
> EMC authority Henry Ott teaches that shielding provided by coax depends
> on the resistance of the shield and its uniformity. W2VJN, author the
> the excellent guide to Managing Interstation Interference, noted in the
> second edition that stubs cut from coax with shield construction like
> LMR400 deteriorated over time sitting in his garage.
>
> My advice would be to use RG8/213-size coax with from a factory that you
> trust for excellent construction quality and having a dense copper braid
> and low shield resistance. Shield resistance is, of course, a function
> of skin effect, which in turn is a function of DC resistance and the
> o.d. of the conductor. The measured parameter for shielding
> effectiveness is the Transfer Impedance, which is the ratio of the
> differential voltage inside the coax to the common mode shield current.
> The lower limit on Zt is the shield resistance.
>
> 73, Jim K9YC
>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|