[TowerTalk] Skinny QRO coax jumpers for station interconnection

[N2TK, Tony]

Gedas,
Tnx for the info.
Looking on eBay I see several listings for RG400 from China. I had heard Harbour Industries in VT makes a high quality cable. Not sure about the stiff from China.,
N2TK, Tony 

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Gedas
Sent: Friday, March 16, 2018 2:13 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Skinny QRO coax jumpers for station interconnection

RG-303 is a good cable but not as good as RG-400 or RG-142 because it uses only a single shield.  Also, I would still use RG-400 over RG-213 because it meets his desire for a small O.D. cable and because he is using it for switching filters etc where the higher shielding effectiveness of the RG-400 is desirable and will offer better immunity to cross talk etc.

Plus, with a Teflon based coax you never have to worry about the center conductor migrating from center, even under QRO and extreme heat and tight bends.  I was biased when I posted using RG-142 because I was lucky enough to find a 1000' roll of it and have been using it for jumpers for years & years. But RG-400 is more flexible and of the same high quality as 142.

It used to be that RG-213 meant an upgraded quality version of a cable like RG-8 (solid dielectric & VF = 0.66) but with two copper braids vs. 
one. RG-214 was the same as RG-213 but used a silver coated copper center conductor and dual silver coated copper braids for even higher performance and better S.E.  For MIL applications we used lots of RG-223, RG-142, RG-400, RG-214, and of course tons of semi-rigid. I was very, very lucky when I was able to purchase five left-over 1000' rolls of new RG-214 for, you don't want to know, and have enjoyed giving most of it away to friends & family.

Gedas, W8BYA

Gallery at http://w8bya.com
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On 3/16/2018 1:33 PM, Rob Atkinson wrote:
> I see no mention of RG 303 and wonder if that's been discontinued.
>
> for jumpers I'd use 213.  If you need a tighter bend radius I'd 
> re-arrange or re-locate the connection points instead of using skinny 
> silver coax.
>
> Rob
> K5UJ
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