Recommend: A dBm caluculation small software

Please tell me how can i get the file "vb40032.dll" ?

Another one ......
You will find ratings of power in dBm, voltage level in dBμV or you ask yourself, which power amplification does my PA have really?
This little program includes several calculations for home brewers and should serve as rapid assistant.
For sure there are tables, calculators (who has the formulas kept in mind?) and software, which is more comfortable...
with English,German and Spanish doc.

Maybe you guys can try the RFSim99, it has some kinds tool included
a. Pi/T attenuator calculation
b. simple matching netwotk calculation
c. filter calculation
d. A calculator to do dBm/Vrms conversion and much more

The most important, it is free to use.
try here http://www.hydesign.co.uk or search by google