ssb qrp bd139

Please I need to make out an amplification of an 2.2 MHz electric signal in order to have a 5W signal and I need if it possible a good scheme of this amplifier

Whats the gain of this amplifier and other specification including the application.

In fact I'm in need of using a Function generator wich can give me 20V maximum and passing by the amplifier I should get some 5-10Watt! and I have to generate a 2.2MHz signal.

I'm not too good in this but I think that a Class A or class B amplifier could be used. But I need an already working sheme if it is possible. Thank you very much

When you specify the output power you have to specify also the load impedance/resistance.

At this power and frequency there are a lot of audio or PS switching transistors that works, for example BD139 or IRF510.
http://www.nxp.com/acrobat_download/..._137_139_3.pdf
http://www.irf.com/product-info/data...ata/irf510.pdf

Just search the net for 3.5MHz (80m band) ham-radio QRP SSB power amplifier and you will find a lot of schematics. You have only to slightly tune for your needs.

http://lea.hamradio.si/~s57nan/ham_r...0m/ssb80pa.jpg
../imgqa/eboard/Antenna/rf-yxr0y1oc35q.gif

In fact the input impedance is about 50 Ohm, but the output one is only 10 Ohm or less, because I'm using this to generate some ultrasonic waves so the transducers are not well calibrated! but I think if I use an adaptator I can get a lower impedance at the output of the amplifier No?

But thanks a lot

I was about to suggest the CREE GaN amplifier but you output impedance is a concern.

http://www.cree.com/products/wireless_products.asp