CTC-4 Director 21

[Penthode]

Interesting the worst smear is between magenta and green. This color transition is the greatest phase swing. This suggests that the chroma channel response is bad.

The chroma response of the later (CTC4 on) sets is dependent upon a good complementary video IF and chroma channel response.

[old_tv_nut]

Originally Posted by Penthode

Interesting the worst smear is between magenta and green. This color transition is the greatest phase swing. This suggests that the chroma channel response is bad.

The chroma response of the later (CTC4 on) sets is dependent upon a good complementary video IF and chroma channel response.

Second this, but seeing it at both demodulators would confirm it.

SwizzyMan, what kind of scope do you have? If it is capable of syncing on a separate signal from the one you are viewing, it's good to know how to do that for future reference. You could sync on the luma, the sync separator stage, or just by putting a probe somewhat near the flyback (not too close!), and then look at whatever you wanted with the other input.

[SwizzyMan]

Originally Posted by old_tv_nut

Second this, but seeing it at both demodulators would confirm it.

SwizzyMan, what kind of scope do you have? If it is capable of syncing on a separate signal from the one you are viewing, it's good to know how to do that for future reference. You could sync on the luma, the sync separator stage, or just by putting a probe somewhat near the flyback (not too close!), and then look at whatever you wanted with the other input.

Its a tektronix TAS 220. 20 mhz analog scope, not the greatest but it normally works.

[old_tv_nut]

Originally Posted by SwizzyMan

Its a tektronix TAS 220. 20 mhz analog scope, not the greatest but it normally works.

Nice little scope - you can trigger on channel 2 and poke around with channel 1.

[SwizzyMan]

Can't seem to get the scope to trigger. I really need to look for a better one here soon anyway. I'll keep messing with it, maybe I can get it to trigger.