GPSDO alternative

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  • Updated 10 months ago
I have a Flex 6300 and participate in FMT (Frequency Measuring Tests).  The 6300 can't use the GPSDO from Flex so I looked for an alternative.  I purchased the GPSDO from BG7TBL. It is a 10Mhz unit and extremely accurate. I use the setup for frequency adjustment within the Flex software to read my 10Mhz signal.  The results of the FMT show how well it works.  The price was $139.  Try it, you'll like it...
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Bob Brown - N8OB

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  • satisfied

Posted 2 years ago

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Jim Gilliam

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What is the downside of just calibrating on 5/10 MHz. on WWV?
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Tim - W4TME, Customer Experience Manager

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The TCXO in the 6300 is a very accurate and stable driver clock, but it takes time for it to temperature stabilize and it will drift with age.  A GPS disciplined OCXO is more accurate and undergoes constant frequency correction, both in the short and long term frequency stability and accuracy will be better.  This is true of any GSPDO disciplined clock, be it a GPSDO or a Rb clock. 
(Edited)
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Jim Gilliam

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Unless everyone on the band is accurate to 1/1000 Hz., seems sort of moot.
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Tim - W4TME, Customer Experience Manager

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Depends on your application.  If driving a uWave XVTR, this is very important so that you reduce frequency multiplication errors.
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Ross - K9COX

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I find myself drifting with age and a friend tells me I have no long term stability
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Winston VK7WH

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Hi Ross. In doing a little research on the units, it appears there are a number of different models available. Can you tell which models you purchased? Was the 10 MHz output sinewave or square wave?

Many tnx

Winston
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Bob Brown - N8OB

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I purchased the BG7TBL 2016-05-31 version and it is sinewave.  I have a rubber duck antenna on the 10Mhz connector which I use to check the radio frequency and for adjustment purposes.
Bob - N8OB
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Mike va3mw

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During FMT with my stock 6300 and using the 800hz beat tone, I think I was less than 1Hz on all readings.  It was pretty impressive.  My worst reading was 0.80 Hz and my best was 0.08Hz.  I even surprised my self.  And, that was my first time.  
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Larry - W8LLL

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How is an external 10 MHz GPSDO connected to a 6300?
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Michael Walker, Employee

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A 6300 will not support 10Mhz or a GPSDO.

Mike
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Larry - W8LLL

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That's what I thought but the first post is saying otherwise.
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Larry - W8LLL

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I understand now what he is doing.
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Michael Walker, Employee

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Ah.  He sent a 10Mhz signal to the radio on one of the antenna ports and then did the 10mhz calibration much like you would do on WWV.