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

[Vic Rosenthal]

This is one of my pet peeves with the W2 -- it does not have an option for delivered power. Yes, I know how to subtract, but it's beyond trivial to do this in the software, and it would be convenient.

Vic 4X6GP

> On 6 Mar 2017, at 05:32, Alan Bloom <n1al at sonic.net> wrote:
> 
> 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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