[Discuss-gnuradio] NTSC Audio, Got It

[Thom Rainwater]

I took another look at the code I submitted before. The problem was
that the dboard was tuning to RF_freq instead of RF_freq + 1.75e6
(which is the center of the band for the TV spectrum). So if you change
the lines:

(success, actual_freq) = dboard.set_freq(RF_freq)
and
IF_freq = -5.75e6 - RF_freq+ actual_freq - 1.75e6

to

(success, actual_freq) = dboard.set_freq(RF_freq+1.75e6)
and
IF_freq = -5.75e6 - (RF_freq+1.75e6) + actual_freq

you get the audio signal from the tv antenna. Ah-ha!

I've been able to tune in a couple stations. The audio isn't great, but its there!

Thom