24-10-2016, 09:06 AM
Have you a filter on resistor DAC output?
Have you a spectrum analyser you can feed with test signals from pic that are entirely frequency gratings? (Check at each point in signal chain from PIC DAC to 1st TV IF)
It could be some sort of mixing / aliasing in buffer, modulator, TV RF/Mixer, IF first stage etc.
Can you adapt to feed direct video?
Have you a spectrum analyser you can feed with test signals from pic that are entirely frequency gratings? (Check at each point in signal chain from PIC DAC to 1st TV IF)
It could be some sort of mixing / aliasing in buffer, modulator, TV RF/Mixer, IF first stage etc.
Can you adapt to feed direct video?