Flex6500 GPSDO and FLDIGI are killer FMT app.

  • 1
  • Praise
  • Updated 4 years ago
The title says it all.
With the Flex 6500 and FLDIGI frequency analysis mode I can measure frequency to 2 decimal places!
Andrew de VK5CV/VK5ZUC.
Photo of Andrew Russell

Andrew Russell

  • 260 Posts
  • 33 Reply Likes
  • excited

Posted 5 years ago

  • 1
Photo of Robert -- N5IKD

Robert -- N5IKD, Elmer

  • 488 Posts
  • 152 Reply Likes
Can you illustrate this with a screenshot?
Photo of Andrew Russell

Andrew Russell

  • 260 Posts
  • 33 Reply Likes
Robert,
13MHz TCXO in frequency counter.
Andrew
Photo of Sergey, R5AU

Sergey, R5AU

  • 835 Posts
  • 109 Reply Likes
Well Andrew, FLDIGI freq = RF Freq + Audio freq from waterfall
Photo of Bob Wright, N7ZO

Bob Wright, N7ZO

  • 268 Posts
  • 66 Reply Likes
Although the RF sampling rate is very accurate with the GPSDO, do we know that the effective sampling rate of the 6000's DAX output audio is as accurate?

If everything inside the 6500 or 6700 is clocked from the same master oscillator this is probably true, but I can imagine designs where output audio resampling occurs using another (and less accurate) clock domain.

I ask because I am also interested in FMT without having to use external hardware.
Photo of Sergey, R5AU

Sergey, R5AU

  • 835 Posts
  • 109 Reply Likes
Hi Bob, in the installation package of the MIxw32 - > http://mixw.net/, exist small apps for checking sample rate of audio device (48kHz supported),
sorry screenshot on rus:

Photo of Andrew Russell

Andrew Russell

  • 260 Posts
  • 33 Reply Likes

Sergey

I have been running Check SR for a while.

-30ppm and -20ppm input and output so 50ppm all up

On the 10MHz GPSDO output I get 999999.94.

6parts per 10E9 total

GPS SSDR 5 e-11 estimate on the setup screen

thus DAX ( and FLDIGI?)  60pp10E6

Good enough for an ionospheric path.

Andrew





Photo of Andrew Russell

Andrew Russell

  • 260 Posts
  • 33 Reply Likes
Photo of Sergey, R5AU

Sergey, R5AU

  • 835 Posts
  • 109 Reply Likes
Hi Andrew, you is right, this radio support reception from universe :-)
my GPSDO estimation on setup screen depends on time of the day  from e-10 to e-12 :

Photo of Andrew Russell

Andrew Russell

  • 260 Posts
  • 33 Reply Likes
And FLDIGI lets me add a 60 ppm correction.
(Edited)