W2 Question

[Richard Thorpe-2]

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?

R Thorpe K6CG
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[Don Wilhelm-4]

The internal tuner does not change the SWR on the feedline (at the
output of the tuner).  It will change the SWR that is at the input of
the tuner, and that is the SWR indicated by the K3.  The W2 is
indicating the SWR at the tuner output (and that will not change with
tuning).

For those who want to have the feedline SWR and the power output
displayed, the W2 is "the way to go", if that does not interest you,
then it may not be of value to you.

73,
Don W3FPR

On 10/24/2013 2:00 PM, 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?
>
>

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[Rick WA6NHC]

The short answer is that they are both correct.  Each measures the SWR AT THAT POINT in the system.

Rick wa6nhc

Tiny iPhone 5 keypad, typos are inevitable

> On Oct 24, 2013, at 11:00 AM, Richard Thorpe <[hidden email]> 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?
>
> R Thorpe K6CG
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

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[k6dgw]

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

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