asrock70
Full Member level 4
I have a question about measuring RF power.
Have RF source 10MHz 0-100W , this works to Z load , if Zload is R=50 everything is sunny and Pout=U^2*R,
In this case, but Zload change impedance with temperature (significantly] the part of the performance is reflected back to the source
Therefore it is between source and load, SWR meter 2 or in more expensive 1. (If SWR exceeds 5, source si power down]
But what if I want to measure the actual power delivered to the load?
If I search RF watt meter I find many construction with AD8307 3 , but this measure only voltage and presumes 50 Ohm load.
The solution is **broken link removed** but this is for my complicated and expensive.
Is possible add current sense transformer, 4 and P=U*I when U=DC voltage form 3 and I=DC voltage from 4 ?
Or maybe somehow use information from 1 or 2 SWR?
Advise how to easily and cheaply measure output power?
Have RF source 10MHz 0-100W , this works to Z load , if Zload is R=50 everything is sunny and Pout=U^2*R,
In this case, but Zload change impedance with temperature (significantly] the part of the performance is reflected back to the source
Therefore it is between source and load, SWR meter 2 or in more expensive 1. (If SWR exceeds 5, source si power down]
But what if I want to measure the actual power delivered to the load?
If I search RF watt meter I find many construction with AD8307 3 , but this measure only voltage and presumes 50 Ohm load.
The solution is **broken link removed** but this is for my complicated and expensive.
Is possible add current sense transformer, 4 and P=U*I when U=DC voltage form 3 and I=DC voltage from 4 ?
Or maybe somehow use information from 1 or 2 SWR?
Advise how to easily and cheaply measure output power?