[TowerTalk] SWR and voltage

[Steve Hunt]

Steve,

Firstly your figures are out for the 50 Ohm system; the figures are 
273.9V and 5.5A

Once the SWR is no longer 1:1, there is an infinite range of impedances 
for any particular SWR, and therefore an infinite range of voltages and 
currents for a dissipation of 1500W. However, here are the upper and 
lower limits:

2:1 SWR: 387.3V / 3.9A thru 193.6V / 7.7A

3:1 SWR: 474.3V / 3.2A thru 158.1V / 9.5A

Steve G3TXQ



On 26/09/2016 16:17, Steve NR4M wrote:
> Hello all,
>
> As I recall, in a 50 ohm system, 1500 watts is about 400 volts and 
> about 6 amps.   Could someone give me an approximation of what I could 
> expect at 2:1 and 3:1 SWR?
>
> Or, direct me to a formula.
>
> I am looking at some gas discharge devices to help me mitigate 
> lightning issues and damage.
> I have been using low voltage ones for years with low voltage DC 
> control lines and such, and now I'd like to try and apply them to the 
> coax lines.
>
> 73 de Steve NR4M
>
>
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