[Elecraft] A question on the P3 or actually the Tx Mon

[Alan Bloom]

The P3 shows total forward power.  The power delivered to the feedline 
is forward minus reflected.

With a 13:1 SWR, 73.5% of the power is reflected and 26.5% is 
transmitted.  If the transmitted power is 92 watts then the total 
forward power should be 347 watts.

Alan N1AL


On 03/05/2017 06:58 PM, Grady Harper via Elecraft wrote:
> I placed the DCHF-200 after my antenna tuner.  In other words, the
> DCHF-200 is between my tuner and antenna.  When relying on my tuner
> to match the antenna to the radio My power meter (on the P3) is
> showing an SWR of a little over 13:1 (which is about right) .  My
> meter on my tuner is showing about 92 watts of power headed down the
> antenna,but the meter on the P3 is showing over 200 watts.  My
> intended output being 100 watts.  Does the DCHF-200 show out-going
> pwr + reflected pwr?  The tuner matches the antenna to the radio, and
> the tuner meter shows a very very small amt. of reflected power. I
> put the DCHF-200 at this location, because if I had the tuner
> installed in the radio, this is where it would go.
>
> The antenna is a fan dipole trimmed for 40 meters and 20 meters.  I
> am on  3.810 MHz and without the tuner the SWR is about 13.2:1 here.
> The tuner matches the antenna to the radio with a SWR of very close
> to 1.0:1. .
>
> AJ4YA Grady
>
> Thanks.
>
> Sent from my iPad
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