Re: [Discuss-gnuradio] Implementing Dicke switching

[Marcus Leech]

Matt Ettus wrote:

> Dicke switches have typically used rates in the low hundreds of Hz, with
> a 50% duty cycle.  My understanding is that is not necessary, and was
> only done to make things easier with the electronics of the time.  I
> think I would switch at a much lower rate, 1 Hz or less, and probably
> use a calibration duty cycle on the order of 10%.  This way you can
> easily throw out some samples on either side of the switch time without
> having to worry too much.
>
> Matt
>
>
>  
Actually, the few-hundred-hz rate was chosen to improve the "fidelity" 
of the
 calculation--the more-often you look at the calibrator, the more 
precisely you
 can track gain fluctuations in the system gain.  This assumes that the 
calibration
 source fluctuates to a much smaller degree than the total system gain.

I'm thinking of switching at a lower rate also, mostly because doing so is
 easy with existing infrastructure in the applications--there's already a
 1Hz timeout used for various housekeeping activities.

--
Marcus Leech                            Mail:   Dept 1A12, M/S: 04352P16
Security Standards Advisor        Phone: (ESN) 393-9145  +1 613 763 9145
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