pa hf 5w

Curremtly iam designing the 5W Class AB PA and iam facing a problem of finding a high power transformer ( Balanced to unBalanced ) with ratios 4:1 ...
does anyone know any company or manufacturer that can i find this transformer ?
Notr : i search in coilcraft but their transformer only supports 2W maximum ...

What is the frequency range? If your bandwidth is small you can use transmission line types. Otherwise you can wind your own. The book Transmission Line Transformers by Jerry Sevick, W2FMI is a good place to start. This book is quite popular and may be in a local library.

If you are looking for HF transformers you may have luck at these places
http://www.communication-concepts.co...ansformers.htm

and

http://www.rfparts.com/combiner.html#Broadband

Both are great companies to deal with!

/WebDog

The frequency range iam using is around 10-100MHz is this transformers can support this frequency range

Here it is:
http://www.rhombus-ind.com/pt-cat/rf-2.pdf