bikerbiker
Newbie level 4
I have filtered a 25MHz signal its level is -40dBm no second order sprog, 3rd order is at -35dBc then amplified it with a simple transistor amplifier ( feed back resistor from collector to base, with supply connected to resistor above collector) and the 2nd harmonic sprogs have risen to within about -12dB of fundamental, 3rd order are at -30 dBm as expected ( gain of 40) 2nd order -12dbC. How can I reduce this massive aamount of unwanted signal amplification, can any one help.
Cheers
Bikerbiker
Cheers
Bikerbiker