The best way to boost an RF transmitter? Answered
Here I have a small and simple FM transmitter based on a simple transistor oscillator, however, due its simplicity, is weak for my needs: I need to transmit the signal to a distance of about 33 feet.
Notice that I will use the transmitter in a rural location and around the building there are no other houses, so I will avoid the risk to cause interferences to other people.
Well, so I was thinking to implement an amplification stage, after the transmitter, and I ended up with the following schematic:
On the base of Q1 I have a female jack where i get the audio signal from an MP3 player.
However I have some doubts about resistors values for the amp stage: these values seems too much great to me:
I get the Transistor values (BFR36) from the datasheet: http://www15.zippyshare.com/d/nmSyQm6e/625003/BFR36.pdf
and I calculated the values here http://www.vk2zay.net/calculators/transistors/bjtBiasing.php (choosing "desing given emitter voltage")
The power supply, as shown in the schematic will be equal to 12 V DC.
But as I've said I'm not very convinced of resistors values for the amp stage, which seems too much greats. On the other hand, due to the fact that the amp stage is an emitter follower, it will just amplify the current and not the voltage: would be able to give a decent boost on the signal output? What I can expect?