RG-6 with a CCS center conductor is all about the same as far as RF or DC
loss is concerned. Figure on .35dB/100' at 2MHz.
When I used 750' of RG-6 to feed the RCS-4 Beverage switch 25 years ago I
had no problem with the switching. I also used a small preamp at times.
That cable didnt last one winter before critters destroyed it and I ran
.412" CATV hardline which was already pretty much obsolete. That is still in
service and yearly tests show no additional loss which is .13dB/100'.
The 1/2" 75 Ohm CATV hardline comes in a hair less at .09dB/100'. I use the
3/4" for transmitting on HF since it was the most used during the network
construction and I was given huge amounts of partial to almost full reels
when the installation contractors left for Indiana for their next
job....real gypsies!
I use 7/8 and 1" for VHF and up.
Carl
KM1H
----- Original Message -----
From: "Bill Wichers" <billw@waveform.net>
To: "Timo Korhonen" <timo.korhonen@elisanet.fi>
Cc: <topband@contesting.com>
Sent: Thursday, June 26, 2014 5:27 PM
Subject: Re: Topband: Beverage feedline
The copper clad steel center conductor won't make much difference in terms
of loss on 160m. It is an issue if you will be powering Anything through
the coax (like amps or antenna selection relays) since the dc resistance
is higher.
If you need solid copper center conductor rg6 you can get that too - its
sold for satellite systems that run dc on the coax to power the LNB at the
dish. It will generally be more expensive. Solid copper center conductor
will be listed as type BC (bare copper) in the datasheets.
Sent from my iPhone
On Jun 26, 2014, at 11:12 AM, "Timo Korhonen" <timo.korhonen@elisanet.fi>
wrote:
Hi all,
We are putting up new beverages for 160/80 at OH5Z.
I have a question regarding the feedline. We have to make
quite long runs like 1500 feet.
When looking for a low cost 75 ohm coaxial I found a Belden
RG6 type cable which is reasonably priced.
Here is a link for technical data
http://www.farnell.com/datasheets/1733139.pdf
This cable has a copper covered steel inner conductor.
Is this an issue on low frequency like 1.8 MHz with long runs like 1500
feet?
Thanks for your help
73, Timo OG9X
oh5z.wordpress.com
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