Haven't seen any response to this, James, and am probably not going
to be much help.

I've just used RG58 variants for up to 100' in permanent 
installations around the yard, 10 to15 years in some cases.   One of 
them runs through about 70' of rigid PVC electrical conduit IPEX 
#032907 and is buried.   Mind you, I've heard that although such 
conduit will keep the groundwater away from the coax, water vapor 
will condense inside, leading to a wet interior anyway.   That coax 
still seems to work,so maybe it's dry...or maybe not.
On DXpeditions, I've run over 500' of  RG58 coax to DKaz'es and such, 
and not suffered particularly.
best wishes,
Nick

At 22:26 2019-01-27, James Niven wrote:

I am curious as to what type of coax everyone uses for DKAZ antennas and
also general international shortwave band listening dipoles?
It's time to revamp my antennas and I want to use the right cable that will
last for a while.
I have read that RG-8U is good for long runs of a 100 to 150 feet, and if I
was to bury my coax, which is the best pipe/conduit to use to bring my
cables into the shack?
thanks
James Niven
Austin, Texas


											

There are a few important issues to consider with coaxial cable.

1) use a cable that doesn't have a cellular insulation that can take on
moisture i.e. RG58c

2) do not use cable that is silver plated especially in a salt environment
because the cable screen may disintegrate over time.

3) Most important! where the coax. is used to feed the voltage to an active
antenna or amplifier. Make sure that exposed connector does not take on any
moisture, otherwise there can be build-up of a conductive residue across the
connector and this will generate considerable noise with the feed voltage.
Ensure that the exposed connector is made water proof e.g. use a PVC fuse
boot packed with Vaseline or Dow Corning DC4 silicone grease.

Kind regards

Andrew Ikin

-----Original Message-----
From: Nick Hall-Patch
Sent: Monday, January 28, 2019 4:06 AM
To: Mailing list for the International Radio Club of America ;
nrc-am@googlegroups.com
Subject: Re: [IRCA] Coax Cable

Haven't seen any response to this, James, and am probably not going
to be much help.

I've just used RG58 variants for up to 100' in permanent
installations around the yard, 10 to15 years in some cases. One of
them runs through about 70' of rigid PVC electrical conduit IPEX
#032907 and is buried. Mind you, I've heard that although such
conduit will keep the groundwater away from the coax, water vapor
will condense inside, leading to a wet interior anyway. That coax
still seems to work,so maybe it's dry...or maybe not.

On DXpeditions, I've run over 500' of RG58 coax to DKaz'es and such,
and not suffered particularly.

best wishes,

Nick

At 22:26 2019-01-27, James Niven wrote:
>I am curious as to what type of coax everyone uses for DKAZ antennas and
>also general international shortwave band listening dipoles?
>
>It's time to revamp my antennas and I want to use the right cable that will
>last for a while.
>
>
>
>I have read that RG-8U is good for long runs of a 100 to 150 feet, and if I
>was to bury my coax, which is the best pipe/conduit to use to bring my
>cables into the shack?
>
>
>
>thanks
>
>
>
>James Niven
>
>Austin, Texas
>
>
>
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>original contributors and do not necessarily reflect the opinion of the
>IRCA, its editors, publishing staff, or officers
>
>For more information: http://www.ircaonline.org
>
>To Post a message: irca@hard-core-dx.com

Nick Hall-Patch
Victoria, BC
Canada

Thanks! Off the air for the night.

Colin Newell - Victoria - B.C. CANADA -

> On Jan 27, 2019, at 8:55 PM, Volodya S <canswl@gmail.com> wrote:
>
> Thanks to Colin Newell for getting a west coast Kiwi SDR on-line today. I
> compared my location (about 5 to 7 km away) to his. At 03:00, I noted that
> mostly on 1590 he's hearing KLFE from Seattle, with many "The Answer" IDs.
> For me, I'm also hearing weakly, a cochannel. Wasn't sure who it was until
> I heard "94.3", which make this the Tilamook, OR True Oldies station, KTIL
> which occasionally dominates the channel. All nice! 73, Walt
> _______________________________________________
> IRCA mailing list
> IRCA@hard-core-dx.com
> http://montreal.kotalampi.com/mailman/listinfo/irca
>
> Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers
>
> For more information: http://www.ircaonline.org
>
> To Post a message: irca@hard-core-dx.com
>

Thanks to Colin Newell for getting a west coast Kiwi SDR on-line today. I
compared my location (about 5 to 7 km away) to his. At 03:00, I noted that
mostly on 1590 he's hearing KLFE from Seattle, with many "The Answer" IDs.
For me, I'm also hearing weakly, a cochannel. Wasn't sure who it was until
I heard "94.3", which make this the Tilamook, OR True Oldies station, KTIL
which occasionally dominates the channel. All nice! 73, Walt

It matters a little because you lose power due to the mismatch.
In principle, you lose 5.7 dB when transforming 50 to 75 Ohms or vice versa. While not a lot, that is enough to make a noticeable difference with a small antenna or poor receiver. With a Beverage and a good receiver, no problem.
RG58 is the 50 Ohm standard and is super widely available.
But the most important reason to use 75 Ohm RF6 0 to me - is that the RG6 crimp connectors are waterproof.

Chuck