El 27-06-14 19:45, Allodoxaphobia escribió:
On Fri, 27 Jun 2014 17:42:38 +0200, Wimpie wrote:
El 27-06-14 17:15, Ralph Mowery escribió:
I would like some opinions as if anyone could notice replacing 100 feet of
rg-213 with 7/8 inch or larger hardline would be noticiable.

One ham said when he did he could tell the differance. I just don't see
that going from about .4 db or less of loss to .15 db of loss on 80 meters
is going to be noticed. That is about like going from 100 watts of
transmitted power to maybe 105 watts or less.

In the past I have inserted some 1 and 3 db pads in line with a receiver to
see if I could tell the differance and have a hard time telling that even
the 3 db pad makes much differance in casual operation, especially below 20
MHz.
Maybe some have more sensitive ears than I have.

What kind of difference did he notice?

I am thinking of signal strength at target area, received signal
strength, S/N ratio, change in antenna radiation pattern, etc.

Some other thing to consider, what will be the VSWR in the line. If
that is really high, hardline can make a difference like coaxial
versus ladder line attenuation.

Other possibilities: He swapped out poor RF connectors for good ones.
Or, the WX beaten - possibly water penetrated coax was replaced by
better condition hardline.

Not pertaining, but at a previous QTH I used 1/2" Cable TV hardline to
feed a 6M beam, and 3/4" Cable TV hardline to feed a 2M beam. I had
nothing to compare it with, but I was Very, Very Pleased with the results.

All-in-all I believe the hardline will be more WX durable than the coax.
73
Jonesy


You are right, damaged/aged HW (cables/connectors) versus good HW can
make a difference. If so, in my opinion the "one ham" should have
mentioned relevant additional info.

--
Wim
PA3DJS
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