[Premium-Rx] Frequency Measuring Test

[Carcia, Frank A. HS]

     I'll contact my cousin Joe at the ARRL NJ1Q who is the station manager.
I know they run Harris but don't know 
    what the standard comes from.      fc

-----Original Message-----
From: John Reed [mailto:jreed at alum.mit.edu]
Sent: Sunday, January 12, 2003 1:51 PM
To: Premium RX
Subject: Re: [Premium-Rx] Frequency Measuring Test


 

----- Original Message ----- 
From: jan at skirrow.org <mailto:jan at skirrow.org>  
To: John Reed <mailto:jreed at alum.mit.edu>  ; Premium RX
<mailto:premium-rx at ml.skirrow.org>  
Sent: Sunday, January 12, 2003 11:15 AM
Subject: Re: [Premium-Rx] Frequency Measuring Test

At 04:43 PM 1/11/03, John Reed wrote:


Did anyone besides yours truly participate in the ARRL Frequency Measuring
Test?  I did, and received the results by mail yesterday.  The transmitted
frequency on 40 meters was 7046882.3 Hz.  I measured 7046882 with the Harris
RF-590/Austron oscillator using an oscilloscope, signal generator and
counter.  That's a 0.04 PPM error in frequency.  Not too shabby!  I think I
could have gotten closer but conditions were bad.  About an hour earlier I
could hear the ARRL CW transmissions on all bands, but the ionosphere fell
apart during that hour, and I was lucky to hear the 40 meter transmission.
 
John Reed
 


Out of curiosity, what accuracy does ARRL claim for this signal? I.e. is it
7046682.3 plus or minus .01 or better? 

In the letter they sent, they said  "Due to doppler effects and other
propagation anomalies, errors of less than about 0.4 PPM are considered
normal."  On the ARRL web site, the transmitter is a Harris controlled by a
GPS  frequency standard, so it should be very accurate.

John Reed



 

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