[TowerTalk] UL listed protector for ladder line

[Jim Brown]

On 6/13/2025 11:34 AM, Ken WA8JXM wrote:
> Not very well.  The voltage on a matched 50 ohm line at a KW is only 223v.
> On an open wire line presenting 2000 ohms at the arrestor, the voltage is
> 1400v.

This is really the heart of the problem, and even this value assumes a 
matched load. But most two-wire line is used at frequencies where the 
load is NOT even close to matched. In his excellent ARRL book on the 
topic, N0AX recommended a spark gap at a properly bonded entry panel.

73, Jim K9YC