As several readers will appreciate, I have been a proponent of direct upconversion from audio to RF for some time using image cancellation and quadrature upconversion techniques. These are particul
Hello, Why not try it another way: in software upconvert the audio to 20kHz (or 40kHz if you have a 96kHz sound card), mix up to 136kHz or 472kHz and filter out the remaining sideband which is 40kHz
Hi Jacek, What you describe is exactly what i'm doing here. BTW i had to slightly modify the LO (xtal) circuit because it didn't start to oscillate at low temperatures (now proved at -20 C!). Now it
Having true baseband as an intermediate step is useful for other bands - in particular 24GHz where several types of off the shelf surplus equipment already has an image cancelling mixer, just needing
Having true baseband as an intermediate step is useful for other bands - in particular 24GHz where several types of off the shelf surplus equipment already has an image cancelling mixer, just needin
I already have a voice band to I/Q bit of software. Written by G3PLX, it also generates AM and FM using a crafty use of a dummy low frequency tone at low level to cope with the DC slot. http://www
