Good day,
*********** REPLY SEPARATOR ***********
On 22-Apr-07 at 21:11 Lester Veenstra M0YCM K1YCM wrote:
>And if the 32 mhz source is a sealed unit, I suspect you will find that
>once
>you mechanically set it as close as practical, that varying the Vcc will
>allow you to use it as a narrow VCO.
Fair enough. However, I need some clarification. Magnus used some terms
that are utterly unfamiliar to me. See below.
<snippety>
>The most straight-forward fashion is naturally to lock it through a PLL.
>
>Highest common comparator frequency is 2 MHz, so divide 10 MHz by 5 and 32
>by
>16, compare with SR-gate, use either a passive lag or better yeat, and
>active loop. Three digital ICs and an op-amp. If the 32 MHz reference is a
>crystal
>then hooking into the caps for a varicap is easy enought for most hams.
I suspect a full-blown design engineer would have no trouble following
this, Magnus, and I thank you for your post, but I'm afraid you lost me on a
couple of things.
What is meant by 'passive lag?'
Likewise: 'active loop?'
On the IC's: I can guess at two of the digital side (divide-by-5 and
divide-by-16 counters), but what would the third one be?
The op-amp I can guess at -- probably high frequency/high slew rate,
I'm thinking something in the LF series. And I'm also guessing that it would be
used to compare the two divided-down signals, and produce a difference voltage
if they're out of phase?
The part about "hooking into the caps for a varicap" means nothing to
me in its current form. Are you trying to say I'd need a varactor effect for
the 32MHz source? (That's the only idea that makes sense to me).
Thanks much.
-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner & Head Hardware Heavy,
Blue Feather Technologies -- http://www.bluefeathertech.com
kyrrin (at) bluefeathertech do/t c=o=m
"If Salvador Dali had owned a computer, would it have been equipped with
surreal ports?"
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