[time-nuts] FE-5680A Question

Bob Camp lists at rtty.us
Thu Feb 16 17:20:33 UTC 2012


The sweep range on the LPRO is similar to the sweep range on the FE. The
resonance on the FE may be wider than the LPRO. The cells are similar in
size, so I would *guess* the Q's would be similar. The short term plots
(good unit vs good unit) look a lot alike, which also would argue for a
similar Q. 


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Magnus Danielson
Sent: Wednesday, February 15, 2012 5:37 PM
To: time-nuts at febo.com
Subject: Re: [time-nuts] FE-5680A Question

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
> is very different. They don't spend very much time at the ends of the
> 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
> 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.


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