Posted by
donovanf on
Feb 27, 2018; 1:23am
URL: http://elecraft.85.s1.nabble.com/RG-8X-tp7638643p7638651.html
W4KBX hasn't commented about the frequency at which he intends
to use 100 feet of RG-8X. 0.24 inch diameter coax -- no matter
what type or manufacturer -- isn't the best choice for 100 foot cable
lengths at 21 MHz or above.
It s a much better investment to step up to the next larger diameter
coax, especially at 50 MHz. LMR400 or LMR400-DB (waterproof
flooded coax) are much better choices for 100 foot cable lengths
at 21 MHz or above.
Of course its hard to beat LDF4-50A but at a cable length of only
100 feet the difference in loss compared to LMR400 is less than
1/2 dB at 50 MHz. You'll never notice the difference.
LDF4-50A or LMR600 is an excellent choice for a 200 foot coax
length at 50 MHz. Much beyond 200 feet at 50 MHZ and LDF5-50A
or LMR900 is a better choice.
All of this assumes proper installation. Moisture intrusion resulting
from poor installation practices will degrade your investment no
matter what coax you select.
73
Frank
W3LPL
----- Original Message -----
From:
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To:
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Sent: Monday, February 26, 2018 10:28:05 PM
Subject: [Elecraft] RG-8X
The original post by W4KBX was this: "I’m seeking recommendations for
RG-8X coax with the lowest loss. The total run will be about 100 feet."
You cannot defy physics and have low loss with 1/4" coax, no matter who
the manufacture is, but RG8X was his criteria.
John KK9A
Jim Brown K9YC wrote:
On 2/26/2018 11:02 AM, Bob McGraw K4TAX wrote:
> I did inquire as to the application. To feed a 6M yagi being a 6OWL6W.
My thinking, I would cringe at putting up a nice yagi such as this and
not use the feedline with the lowest loss possible. Most likely Andrew
LDF4-50A hardline.
Me too! The 350 ft run from my shack to the 3-el SteppIR is 7/8-in
hardline, transitioning to a short length of flexible coax for the
rotator loop. Scrounged the hard line used for roughly $1/ft. Loss is
about 1 dB on 6M.
73, Jim K9YC
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