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
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
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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