Re: RG-8X

Posted by Bob McGraw - K4TAX on Feb 26, 2018; 11:15pm
URL: http://elecraft.85.s1.nabble.com/RG-8X-tp7638643p7638644.html

I found that not all RG-8X is created equal.  For one project, I
measured 3 or 4 different brands of new RG-8X to find that the loss can
vary considerably.  The measurement method was to use 50 ft, snake it
back an forth across the floor so as not to have adjacent coupling, the
ends fitted with N type connectors and connected to my Spectrum Analyzer
with tracking generator. Normal meaningful sweep was 0.1 MHz to 1
GHz.    I don't recall the numbers but I was a bit surprised to find
significant difference as I recall.  The project was in preparation of
antennas for Field Day operation.

73

Bob, K4TAX


On 2/26/2018 4:28 PM, [hidden email] wrote:

> 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
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]