On 02/15/2012 11:17 PM, Bob Camp wrote:
Hi
If you look at an LPRO or FRS or any of the other brands of Rb's their sweep
is very different. They don't spend very much time at the ends of the sweep
at all. It's pretty much a triangle wave sweep up and back sort of thing.
They don't seem to care weather they catch the lock going high to low or
going low to high. The rate of the sweep is *much* slower than what FE is
doing on these units. Since there isn't a "brain" in most of them, there's
no pattern watching stuff there. They just look for a lock signal (amplitude
out of the detector) and stop sweeping when they see it.
Indeed. For analogue logics of the old dinsaurs that I hurd in the
basement a sawtooth or triangle scanning is a good strategy to track in,
but for a processor logic you can do things a bit differently. Also,
consider that the Q seems to be wide on the FEI 5680A you can sweep
faster without missing the dip. Another aspect on speed is just how
large the (needed) scan range is.
Cheers,
Magnus
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