Total posts : 45366
i’m using an oscilloscope to check the rms voltage at the load. i’ve now fully assembled the filter circuit. i’ve got the H1 jumper set right.
i believe i tuned the frequency properly. its set for 1710khz and my receiver (barely) picks up the signal on 1710. if i had the dip switches reversed then it would be broadcasting on 840 but i don’t hear any of my signal on 840.
Q9 gets slightly warm but not particularly hot when the transmitter is turned. Q3 is totally cold. there is zero volts on the gate and source and 5V on the drain of Q3. does that sound normal?
the only way i am able to pick up any signal is if i hold my receiver within an inch of my antenna.
here is some new measurements taken with my multimeter now that i have assembled the filter circuit:
U1 Pin 1: 7.1V
when i check the output on my oscilloscope with a 50ohm load i still get no signal unless i am modulating with audio. when i do modulate it i get a 80-120mV rms noise with no identifiable carrier frequency.