6400M off frequency

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noticed radio was off frequency tried to do Cal nothing changed had to put in offset -647ppb this brought it to equal tones on WWV any one else noticed this?
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Timothy Dorey

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Posted 2 years ago

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David Orman

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Seemed to work fine for me before I setup my external 10MHz reference. Try 10MHz instead of 15 (or the reverse, forget the default), you may have had trouble with WWV at the frequency default.
(Edited)
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Dan KG0AQ

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Yes, I  have noticed the same thing. The start button does not "hunt" for the calibrated ppb offset.
I had a great signal on 10 and 15Mhz when I tried. I ended up calibrating manually as you did to 
a achieve the correct calibration.  Either a bug or we are missing something in the procedure. My
6400 came set on the "Auto" source with the TCXO locked.  Can anyone explain the correct procedure or is this feature broke?
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Tim - W4TME, Customer Experience Manager

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The correct procedure is to connect an antenna to ANT-1 that is capable of receiving the frequency standard signal (WWV, CHU, etc..)  It needs to be a strong signal without a lot of selective fading, so tuning Slice A to the desired frequency and watching it for several minutes is not a bad idea.  Then enter the frequency in MHz and press the Calibrate button.  The radio will switch to AM mode and do a PLL lock on the carrier and change the offset until they are synced.
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Dan KG0AQ

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I did that procedure exactly as you described and it will NOT come back with a correction. Always stays at 0.  WWV is 25db over s9. Please advise.
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Tim - W4TME, Customer Experience Manager

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Can you post a screen capture of the RX tab?
And the Slice A flag as well.
(Edited)
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Dan KG0AQ

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Timothy Dorey

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yes i did try both 10 and 15 Mhz
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Tim - W4TME, Customer Experience Manager

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I have converted this topic to a support HelpDesk ticket (http://helpdesk.flexradio.com) for expedited issue resolution.  Please respond using the HelpDesk ticket for issue resolution.

If anyone else is experiencing an issue similar to this one, please submit a HelpDesk support ticket for issue resolution.
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Tim - W4TME, Customer Experience Manager

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Official Response
This issue with the FLEX-6400 is now a confirmed software defect and has been added to our bug tracker (#5956)
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mike /k6mgk

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Tim: I'm not pointing any fingers but since it is software shouldn't it of been picked up during while in the testers hands.?
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Dan KG0AQ

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Mike,

You can calibrate manually easily and enter the value in the ppb box.
USB on slice A and LSB on slice B.  Sync for sound. Mine was -620
+/-
(Edited)
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Tim - W4TME, Customer Experience Manager

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Mike, it should have, but it was overlooked.  This happens when you engage humans to do things ;-)
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mike /k6mgk

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Love your honesty Tim :-)
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Doug

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Tim what does this mean to others like myself that have had a 6400M on order for months.
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Tim - W4TME, Customer Experience Manager

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If you have not received it yet, then I am not sure it means anything.  The radio can still be manually calibrated if necessary until we release the software fix that I suspect will be in the next release of SmartSDR due to its criticality.
(Edited)
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Rick WN2C

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Since the OP had an offset of -647 and Dave (comment just below) had an offset of -692, what does this mean in Hz? Since it is in parts per billion, does that mean about 6 HZ?
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David Orman

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Correct 6-7Hz, if the reference frequency was 10MHz.
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Rick WN2C

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Thanks Dave. So the problem is similar to say version 1.4 or so when it was not working then.
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Tim - W4TME, Customer Experience Manager

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Depends on the frequency of the test.  The offset value is in parts per billion (ppb)

If you had 100 ppb correction at 10 MHz that would be 1 Hz

How to calculate this:

The unit of MHz is 1 million Hz
Convert 100 ppb into parts per million (ppm): 100 ppb = 0.1 ppm

10 MHz * 0.1ppm = 1 Hz
So the offset is 1 Hz @ 10 MHz
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Rick WN2C

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Tim, if the TCXO is .5 ppm then wouldn't the error be greater
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Tim - W4TME, Customer Experience Manager

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That is an indication of stability, not accuracy
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Timothy Dorey

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thanks guys for all your time Regards N5QB
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Dave Gipson

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-692 here