[GPS_Standard] GPS_Standard Digest - AVERAGING

[Roberto Barrios]

Hi Bob,

 

Bert would probably answer this question much better than me, but I would say that by not resetting the average, you would be including in your calculation past counts where your reference frequency was effectively being adjusted, which is not desirable.

 

By resetting the averaging count after each adjustment, you start averaging with a “better” reference -with the latest adjustment-, which should help you get closer to the ideal frequency after a few iterations. Including the (very) past values when you were off frequency can only keep you from reaching closer to the target freq.

 

Does this make sense?

 

Regards,

Roberto EB4EQA


Enviado con Correo de Windows


De: gps_standard-request at mailman.qth.net
Enviado el: ‎18‎ de ‎julio‎ de ‎2013 ‎18‎:‎01
Para: gps_standard at mailman.qth.net
Asunto: GPS_Standard Digest, Vol 58, Issue 2



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Today's Topics:

   1. Question about averaging mechanism (Bob Stewart)


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Message: 1
Date: Thu, 18 Jul 2013 08:43:25 -0700 (PDT)
From: Bob Stewart <bob at evoria.net>
To: GPSDO <gps_standard at mailman.qth.net>
Subject: [GPS_Standard] Question about averaging mechanism
Message-ID:
        <1374162205.57641.YahooMailNeo at web5802.biz.mail.ne1.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1

In Summing Mode (haven't looked at voting) I see that the current average is discarded and zeroed when a sampling session ends.? Could someone explain the reasoning behind this to me?? Essentially I'm trying to figure out why each session starts a new averaging count, rather than just applying a change to the DAC and leaving the averaging to run continuously.? I could understand this if there was a coarse correction, but not for a fine correction.

Bob - AE6RV

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End of GPS_Standard Digest, Vol 58, Issue 2
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