[TowerTalk] [Bulk] Terminate braid at top of tower...or

[Grant Saviers]

I've been using RG142 with double silver plated braid for chokes. It 
does have the advantage of 0.195" od and one time very small bend 
radius.  Rated 3.5kw and 1900 volts at 50MHz by Beldon,  works fine here 
at QRO.

Mine is real mil C-17 Thermax surplus,  I got a 1200' spool in an 
auction cheap.

Grant KZ1W


On 11/4/2014 11:19 PM, Jim Thomson wrote:
> Date: Tue, 4 Nov 2014 13:43:57 -0600
> From: "john at kk9a.com" <john at kk9a.com>
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] Terminate braid at top of tower...or
>
> There is no RG-393 inside my Array Solutions or Cal-Av Baluns.  Perhaps
> you are using 10,000+ watt versions?
>
> John KK9A
>
> ##  I have 393 in both the array solutions  w1jr boxes and also the cal-av
> EB-3 bead baluns.  Array solutions rates their box at  10-20 kw.... which I find
> hard to believe..esp with just 4 x 2.4 inch od , type 31 cores used. balun is rated for
> 160-10m.  The cal av balun is rated for 10 kw... and down to 8.5 kw on 10 +12m...
> and 5 kw on 6m.   The cal av balun will take it easily.
>
> ##  for the small amount of coax used in either style balun, I figured 393 was a better bet.
> It only has a 13 ga stranded, silver plated center conductor.  It will hit 200deg C
> when maxed out.    The smaller rg-400 /303 coax only has a 18 ga center conductor.
> It too, runs hot when maxed out.   They both need to be silver soldered.
>
> ##  last thing anybody wants is a blown balun..esp when way out on a boom.  I have seen
> several pix of folks removing huge arrays with a crane... then replacing the blown balun with
> an identical one !   They will get a repeat performance....and do it all over again. The hassle
> and expense of taking down a yagi is a pita..and huge $$ if a crane used.
> The slightly added cost of building the balun stronger is well worth it.   If it wont handle at least
> 2.5 kw RTTY  CCS   24/7 with 3:1  swr.... and some added inbalance, don’t install it.
>
> Jim  VE7RF
>
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