[TowerTalk] RG-58 capacitor

[David Robbins]

Yeah, capacitance varies.  The 40pf/ft was the first one I saw in my belden
book, other variations were listed at 28 or 30pf/ft.

David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net:7373



-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
jimlux
Sent: Monday, June 26, 2017 04:20
To: towertalk at contesting.com
Subject: Re: [TowerTalk] RG-58 capacitor

On 6/25/17 4:20 PM, David Robbins wrote:
> Yes, rg58 should be about 40pf/ft.  just beware, if the length becomes 
> a significant fraction of a wavelength then you have to calculate the 
> impedance based on the length and velocity factor.
>

My table said 25 pF/ft.  RG-8/rg-213 is 13pF/ft


So, moral of the story is, check for the brand of your coax, and use the
appropriate length.

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