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Date Posted: 12:44:52 11/21/01 Wed
Author: sakman
Subject: Re: Sakmann - Canton 4.2 will not lock - HELP
In reply to: LCS 's message, "Re: Sakmann - Canton 4.2 will not lock - HELP" on 19:26:42 11/20/01 Tue

Hey lcs,

>Now tell me, is it OK for the lock indicating
>led never to light up?

Depends if the code includes the LED. If the code includes the LED, then your board is definitely NOT locking - probably some problem with the VCXO.

>I found AC at the inputs RB1, RB2 & RB3 (LBD,
>PED & NED), but the other leads of the PIC are
>as dead as a door knob. Is that correct?

No, something is wrong with the PIC and/or VCXO. Did you program the PIC correctly? Check your VCXO circuit.

>And is it necessary for the external VCO to be
>controlled by the PIC, or can it just deliver
>a stable 20Mhz clock at pin 16?
>I left RA0 (pin 17) open.

I think you should still connect RA0 to control the frequency. The osc needs to go slightly above and slightly below the 20MHz for a solid lock. Check Jens' VCXO page for more info.

Late!

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