Re: LF: Droitwich carrier

[DL4YHF@aol.com]

Hello group,

An analysis of amplitude as effective voltage and phase with SpecLab produced this graph today (aplologies for embedding it in HTML format):


The signal was received in USB (RX tuned to 196 kHz), digitized at 11025 samples/second, multiplied with ~2000 Hz (theoretically) and then decimated by 64 with a lot of cascaded halfband lowpass filters to get an effective RX bandwidth of just below 86 Hz.
Both amplitude (red) and phase (green) are calculated from the decimated complex signal. Unfortunately the SW does not (yet) support different scaling of the phase axis.
The carrier amplitude has obviously got nothing to do with the weak phase modulation. The lowest "audio sidebands" are outside of this software receiver's passband.

Regards,
 Wolf DL4YHF.