Markus, LF,
As a newcomer to LF I find this as an
interesting experiment for real low power or long distance tests for those who
can achieve the necessary frequency stability requirements. I found this to be
quite a challenge...
I have followed your initiative and started similar
windows on my grabbers in YO:
http://dl.dropbox.com/u/10280270/YO/TA3600.jpg
and 4X:
http://dl.dropbox.com/u/10280270/4X/TA3600.jpgThe
4X grabber is currently using the Mercury HPSDR receiver (
http://openhpsdr.org) which is GPSDO locked.
However, the audio is routed to SpectrumLab using Virtual Audio Cable as a
virtual sound card. I have no info regarding VAC sample rate accuracy or how I
can automatically adjust it so this may be a limiting factor, further
experimentation is needed. In the worst case, a real sound card could be used
but then it also has to be locked to GPS.
The YO grabber is usually using
GQD as a reference for the sound card sample rate calibration in SpectrumLab and
the LF receiver is based on a laboratory grade VTCXO. GQD being off air, I was
forced to use DHO which is not very reliable during the night for me as can be
seen on the 137.775 Loran line.
Thanks for the
challenge!
73s
Chris 4X1RF
...
