Re: LF: Slow PSK result

[MarkusVester@aol.com]

Dear John and LF,

based on an idea by Peter Martinez, I then tried to despread the PSK signal by multiplying with a 15+15 minute (+1, -1) sequence before doing the Fourier Transforms. This works as expected, splitting up the Loran carrier and focusing John's signal to the center frequency:



The recording was done using the E-field channel of my normal colour-DF grabber hardware, ie. SSB receiver and standard soundcard. It might be worthwhile to add in 1 Hz reference lines by coupling GPS 1pps pulses into the RX input. One could then possibly use SpecLab's tracking function to compensate for the LO frequency drift, but I haven't tried this in such a configuration.

John, are you intending to transmit again tonight?

73 de Markus, DF6NM