FW: RK05 question

From: Gooijen H <GOOI_at_oce.nl>
Date: Tue Jul 13 09:16:15 2004

Isn't the track index pulse == the one pulse that is fed to the PLL
phase comparator? That pulse is used to synchronize the oscillator
that must run at 12 (or 16) times the frequency between 2 sector
pulses to generate the (missing) sector pulses ....
or am I mistaken here?

- Henk, PA8PDP.


> -----Original Message-----
> From: cctalk-bounces_at_classiccmp.org
> [mailto:cctalk-bounces_at_classiccmp.org]On Behalf Of Paul Koning
> Sent: dinsdag 13 juli 2004 15:59
> To: cctalk_at_classiccmp.org
> Subject: Re: FW: RK05 question
>
>
> >>>>> "Fred" == Fred N van Kempen <waltje_at_pdp11.nl> writes:
>
> Fred> On Tue, 13 Jul 2004, Paul Koning wrote:
> David> the "home" slit and synthesize the individual sectors. Never
> David> tried this with an RK05 [heck havent touched one of them in
> David> over 25 years!], but I have used this technique to synchronize
> David> otgher items.....
> >> I suppose that's possible. One way to do it would be to build a
> >> PLL that's locked to the start of track pulse, and derive a 12x or
> >> 16x sector clock from that. Or, analogously, you could use a PLL
> >> to derive a 16 sector clock from the 12 sector clock (multiple by
> >> 4/3rd, not hard with a PLL). That's probably a good solution...
>
> Fred> Hm, and then ignore the "real" sector pulses and feeding the
> Fred> drive electronics the output of the PLL? Smart, that should
> Fred> work, assuming one can format the packs given this "sector
> Fred> clock".
>
> Yes, that's what I had in mind -- hook the optical sensor to the PLL,
> feed the PLL output to where the sensor used to go. The one obvious
> tricky part is to generate the track index pulse, because it isn't
> equally spaced along with the sector pulses.
>
> Fred> Would these then be called hard- or soft-sectored? :)
>
> Firm-sectored? :-)
>
> paul
>
Received on Tue Jul 13 2004 - 09:16:15 BST

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