RF power amplifier

Thread Starter

veerasamy

Joined Oct 7, 2009
8
I am currently working on radio transmission and reception at the frequencies of around 200MHz. The range of transmission is not currently important.
It is enough if I could transmit for 10 meters or so. My question is, Is it necessary to have a power amplifier? Can an ordinary gain block can be used?
Will antenna be able to radiate without PA?

thanks & regards,
veerasamy
 

studiot

Joined Nov 9, 2007
4,998
You should have no trouble using small signal transistors/FETs or other components to generate enough signal for transmission over 10 metres.

However it would not be wise to try to drive a transmitting antenna directly without interposing buffers to match the impedance levels.
 

Thread Starter

veerasamy

Joined Oct 7, 2009
8
Thank you Studiot. I am using the Gain block ICs. It is internally matched with 50 ohm impedance. Will there be any other issues?
 

studiot

Joined Nov 9, 2007
4,998
Use 50Ω coax to connect from the board to the antenna.

Depending upon the physical format of the antenna you may require a balun.

Altenatively you might try a printed circuit antenna. That should reach 10 metres.
 
Top