[TowerTalk] Fwd: Fwd: RG-149: 50 ohm/70 ohm - does it matter?

[Steve Hunt]

On 16/12/2013 15:34, Jim Lux wrote:
> But that doesn't get back to the original question..
>
> If I have a 75 ohm transmitter, 75 ohm coax, and a 75 ohm load, and I 
> put a 50 ohm Bird in the middle, what does it read.  I think 1:1  (or 
> FWD = something, REV = low)
>


No - it will read 1.5:1

 From the Bird 43 manual:

"Example - Consider using a Bird 43 to tune a 70 ohm line. If the load 
impedance is also 70 ohms, the wattmeter will measure a VSWR of 70/50 = 1.4"

Steve G3TXQ