That's the exact same tuner that i have; the other one is only slightly different but it works the same. I highly doubt the tuner chip is not working, unless you accidentaly put 12 or 30V in some of the pins; either way, since you have several tuners it's just a question of trying the others to see if that's the problem. the potenciometer you use for AGC is irrelevant - you can connect AGC directly to 4V which is the maximum AGC voltage for that tuner.
All I can think of is the basics: checking for short circuits, the stability of the 30V (I just use a separate 24V supply), try bypassing the IF filter and connect the tuner output directly to the radio. How do you know that the ta2003 is tuned to the right frequency?
Also, where did you get the first code you posted from? It has very useful features like the different frequency steps but I can't seem to understand how the frequency is changed
1 Like