Kenwood KT-3300d Alignment Question

[KenwoodM2A]

I expected that. There is very little reason they would drift. Particularly the RF tanks: they do not "pick out a station" but rather "reject stuff far off channel". Functionally a waste of time (though kept you busy and off the streets for a few nights). If reception were bad, it wouldn't be drifted RF tanks but some failure. If parts were replaced, alignment check would be wise, but my impression is that transistor tuners are not so tight-tuned as the days when we replaced tubes willy-nilly. And within reason, the RF tank alignment mainly matters for WEAK signals. We usually favor strong signals, and a few-dB error in the RF hardly matters. If you lived here, we only have weak signals; I would align for best reception (highest signal strength) of WKIT, and maybe one of the two other listenable signals.

Actually you may be right about it being a waste of time but it did keep me out of trouble and I did learn from this experience. 🙂
I'm glad that everyone's support helped me figure out the front end and that I was able to finish the rest of the alignments except for my uncertainty of # 20 and 21.
Anybody want to comment on these 2 alignments that I posted in post # 19 above??

 

[DF96]

I am puzzled by that circuit. It is often difficult to follow a circuit laid out by a draughtsman, but it appears to be something like adding a controlled amount of distortion to cancel what is already there? If so, that is a good way to get excellent specs while damaging the sound. A good FM discriminator will deliver sufficiently low distortion for all practical purposes, so no need to fiddle with the signal afterwards.

Maybe I have misunderstood it.

 

[miklos]

Who knows, Kenwood used the distortion reducing circuit in it's best FM tuners. Like the L-02T ,which has the reputation sounding very good.

 

[KenwoodM2A]

I am puzzled by that circuit. It is often difficult to follow a circuit laid out by a draughtsman, but it appears to be something like adding a controlled amount of distortion to cancel what is already there? If so, that is a good way to get excellent specs while damaging the sound. A good FM discriminator will deliver sufficiently low distortion for all practical purposes, so no need to fiddle with the signal afterwards.

Maybe I have misunderstood it.

From what I understand about the circuit from different sources, you are correct. The circuit is suppose to generate distortion and used to cancel what is there.

My question is, if I connect a test lead to pin 7 of IC 15, as I mentioned in my previous post, and have it connected to my distortion meter, can I read the distortion at this point rather then the audio out? Like I mentioned in my post, I can't seem to get a distortion reading at the audio out like procedure 20 and 21 indicates. I can't seem to figure out what's going on cause I had no problem doing all other distortion readings at the audio out and all the other distortion adjustments are on the same board. The only thing different from this and other procedures is that I'm required to input a modulated 10 kHz signal into my
generator which I did. So unless I'm doing something wrong then I'm at a loss as to why I can't see any changes on my distortion meter when performing this procedure.