[Lowfer] Accurate frequency reference in lowfer band

[Bill de Carle]

A couple of nights ago I tuned across the lowfer band (160..190 kHz) 
after a long absence.  Found a strong signal on 162 kHz that sounded 
much like psk31, but it would not decode.  Figured it must be something 
local, but today I realized it is actually coming from France!  It's a 
french time signal (TDF) broadcasting on the old Longwave Allouis 
station frequency: 162 kHz.  The phase modulation is done in such a way 
that you can measure the carrier frequency easily.  It was probably 
always on the old Allouis carrier but we never noticed it?  They say the 
carrier frequency is controlled by an atomic clock.  It is inaudible 
during the day at my QTH in Ontario but easily detectable by recording a 
minute or so then doing an FFT - the line shows up distinctly and it's 
exactly on frequency.  At night the signal is S8 to S9 here.  If anyone 
wants a convenient reference frequency in the lowfer band, here it is.
For more info: 
https://en.wikipedia.org/wiki/Allouis_longwave_transmitter 
<https://en.wikipedia.org/wiki/Allouis_longwave_transmitter>
Bill VE2IQ