I need help with my digilite v5.9.
this not transmitted.
All voltages are correct.
the communication with the port right.
the LED blinks twice with pc. the Blast sd is not recognized when connected, and the LED keeps blinking twice.
Only carrier on the frequency analyzer, not existing digital transmission.
Could be the dsPIC33 flashed bad?
what other item can be wrong?
There should be some modulation, even if the PC is not connected and the SD card is not connected. Can you see any waveforms on the inductors in the filters, LF1 and LF3?
Which program do you use on the PC - GBPVR or WinTV?
Which PC software versions are you using - v1.40 or v2.50?
Which dsPIC version are you using?
That is the easiest way to test the communication between the PC and the DigiLite pcb.
i have observed in the osciloscope that i have digital output signal pins 18 and 22 for "Q" and also on pins 21 and 23 for "I" when I have not connected the USB and SD card, it is correct?
Also when i have not connected the USB ans SD card, I have a digital modulation in the spectrum analyser. it is correct?
and, other question that i have, when i begin to send packet PC to PCB, i don't see output packet in the PC screen. it is correct?
Look for a 2 volt peak to peak sine wave signals at IC3 pin 1 and pin 7. They should swing from about 1.4 volts to 3.4 volts.
If there is no signal out of the Nyquist filter and you used surface mount inductors check to see if they are shorted to the traces that run between the pads.
The signals at the modulator IC4 will one half the voltage of the signals at IC3 pin 1 and 7. Check pins 1,2,15,16.