PY3CRX PY2PLL wrote:

[snip]
This 11.024XXX divided by 2 is the "corrected clock value" that JVComm32
needs to print a straight vertical line when in HF-FAX mode , 60 lines per
minute. It's not some measured reference value.
[snip]

Hello Marcus,
          ok, understood.

= Argo measured 802,25 Hz - don't remember the decimal portion
= Freq Counter measured 798.8 <> 801.6 - alternating
= Spectran 127 , 8KHz sampling rate, needed  -6.7Hz offset to show 800.0 Hz

When using Spectran, change the sampling frequency within the Spectran Controls 
panel
to 11025.   8000 Hz is a value that many sound cards do not implement correctly

Question: the modulating tones used by WWV HF signal are accurate? How much?

The carrier certainly is quite accurate, but I cannot quote any figure.
Perhaps you could find some info at their Web site :
http://www.bldrdoc.gov/timefreq/stations/wwvb.htm

73
Marcus

73   Alberto   I2PHD