[Amps] 432MHz power/swr measurement

[Augusto Yipmantin]

Hi all,
 
I am a little bit near to finish a cavity to get up to 400 watts output
on 432 MHz.
The thing is that I have a Yaesu YS-500 SWR meter, it can only give me a
readout up to 200 watts.
Could be possible to make some modifications to the resistors bridge to
increase the range to 2000 watts?
 
Any idea on how to measure swr and power with this swr meter is welcome,
 
Regards,
 
Augusto, OA4CVT