Re: VLF: DF6NM 8269.9908333 Hz

[Paul Nicholson <vlf0403@abelian.org>]

> fascinating how the cardioid can switch between America
> and Europe.

Yes and the front/back ratio seems OK, purely based on the
separate amplitude/phase calibrations of each rx.

> Yes indeed, one hour offset.

The time labeling should point to the center of each
1-hour transform, but the transforms are indexed
by their start time.  I expect I've added a 30 min
offset instead of subtracted, or something like that.

Will have a look later.  Having a good 'radio day' here,
no training this morning so an extra few hours to use!

Lots of things on the go - designing LF rx, building a neat
frequency standard around a Trimble GPSDOCXO, experimenting
with getting a good PPS into an Octo/RPi.   Progress on
all fronts today. Gradually getting to like the Octo card,
good job now I have three of them!  One will go into the
LF rx.

Still not sure what to use for a mixer at LF (LO 103kHz).
I've got a few trusty old MC1496 in the junk box, DIP14.
The DIP14 obsolete, SOIC now.  I'd like to use available parts.
Non surface mount would be nice.

--
Paul Nicholson
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