PD85004 Push Pull Amplifier design

hi,

i want to know about the transformer design used in the following link.

"***.qsl.net/in3otd/ham_radio/PD85004_PP_PA_II/PD85004_PP_PA_II.html"

How turn ratios are defined (BN 43-2402 and BN 43-202 cores ) ? Can i find any doc related to transformer design?

Regards

They are just Impedance Matching Transformers.He has optimized appropriate Input and Output Impedance for the PA and calculated.
That's it..

Is it 1:4 impedance transformer?
This design is for 10 Mhz . Can i use the same transformer design for 40 MHz?

I don't know but if it's designed with Ferrite Cores, the transformer is probably wideband transformer.