I keep telling you, apparently to no avail, all you need is a TLI.

Hi Reg, What I am attempting is to measure the PEP output power of a homebrew
solid state amplifier. The amp should provide about 20 db power gain. A TLI
will assure me I have a 50 ohm match. That was given in the orginal post.
What I was looking for was a fairly accurate wattmeter, assuming the load was
around 50 ohms. I was wanting to put a voltage divider at the input to my ATU.
I have several replies stating the voltage divider must be frequency
compensated to have a chance of accuracy. I have a surplus 100:1 scope probe I
will take a look, and report back.
73 Gary N4AST