Peter L. Peres wrote:
>
> tuner has a prescaler ... NEC B562 ...
> I have no instruments to make out the division factor accurately, so:
>
> If you can hint about the (two) division factors of this chip, please do.

The fact that you mentioned there are two factors suggests that you
already know these are probably 10 and 11.
The basic PLL divides by N. A technique called fractional-N synthesis
allows a PLL to lock to frequencies that are a fraction of N
(e.g. 1 tenth) by alternating between two divisors M and N.
I don't fully understand it.

Then again, basic PLLs are good enough for most TV tuners I've seen.
Check out Philips' all-singing-all-dancing tuners.
Baseband video and audio output, some throw in an FM radio as well!

> Guess what I want to do with the prescaler output.Go on, tell us!

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