Ben,
A MICOR channel element is much more than just a crystal; it is a
"system," to use a fashionable noun.
In order to maintain the very close frequency tolerances required of
base stations and repeaters, Motorola started with a very high-quality
crystal that met some exacting specifications, and then added some
temperature-compensating components that were individually tailored to
the crystal. The result is a self-contained, plug-in crystal oscillator
that maintains its output frequency within a tight tolerance, even when
exposed to extremes of temperature.
It is because the compensating components within the channel element
case are made for a particular crystal, that one cannot simply remove
one crystal and install another. The replacement crystal may work, but
it most likely will not meet the tight temperature tolerance without
re-compensation.
Most reputable crystal houses will take your used MICOR channel
elements, re-crystal them, and then re-compensate them to meet original
specifications, for about $50 each. Used channel elements are available
from several vendors for around $3 each. Yeah, I wince every time I
have to spend $100 to set up a new repeater, but I know it is going to
be on-frequency, all the time!
73, Eric Lemmon WB6FLY
Benjamin Naber wrote:
Is there a way a guy can build his own Micor channel element? What is
the Fout of the element- is it a fundamental freq that is multiplied
externally in the exciter or receiver?
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