[Elecraft] W2 Question

[Fred Jensen]

On 10/24/2013 11:00 AM, Richard Thorpe wrote:
> On a particular band I use the K3’s internal antenna tuner to tune
> the SWR to 1.0-1 or so it says.  I have a W2 attached inline and it
> reads an SWR of 1.7-1+ for the same setting.  Which is correct? can
> the W2 readings be adjusted/reconciled with the readings on the K3?
> is there a problem?  What is the point of the W2 if its it does not
> reflect ( no pun intended) the correct readings?

They're both correct.  The K3's internal tuner matches whatever 
impedance it actually "sees" at the antenna connector to the K3's output 
impedance [50 ohms] and thus the K3 "sees" 1.0:1 SWR.  Neither it, nor 
any other such tuner at the rig does anything to the SWR on the coax, 
and the W2 is measuring the SWR on the coax.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2014 Cal QSO Party 4-5 Oct 2014
- www.cqp.org