Re: LF: 18.5 kHz in CT

[MarkusVester@aol.com]

Hi Jay,

judging by the frequencies of other transmissions (eg. Alpha Nav, NWC Australia 19.8 kHz, DHO 23.4 kHz), they seem to be better than the FFT bin width (47 Hz). A couple of monitors (Dunedin and Hawaii) are running at different samplerates, but they have adjusted their scales accordingly. Occasionally there are offsets in the UTC timing, but it is often possible to overlay spectrograms by matching the FSK contents. I have even tried to look for relative delays of spherics, but that's pretty hopeless with 20 ms (6000 km) resolution in the Fourier transformed data.

73 de Markus, DF6NM

In einer eMail vom 21.04.2006 01:12:02 Westeuropäische Sommerzeit schreibt JRusgrove@comcast.net: 

> How accurate are the WWLLN frequency scales? In particular does 18.5 fall on 18.5?