Hi guys,
A few of you might remember my attempts at reverse-engineering Datatrak. I'm making some progress -- I've got my Locator unit to sync up to my fake "trigger" signal (the sync marker which marks the start of a timing chain burst). Sadly I need a bit more...
There are still a few active Datatrak networks that I know of:
- Argentina: 146.455kHz and 133.2275kHz
- Malta (may or may not be still active): 146.1780kHz and 132.9199kHz
- Mexico: 146.155kHz and 132.9275kHz
- South Africa: 160.650kHz and 143.474kHz
I'm after a recording of several minutes of the signal on these frequencies, from a reasonably good quality receiver, in lossless format (a WAV or FLAC file, at a sample rate of 44100 or higher). Mode would be upper sideband, with the receiver tuned about 1kHz lower than the frequencies shown above (so as to push the warbling of the Datatrak signal to near the middle of the audio and IF filter bandwidth).
Ideally I need the flat, unfiltered receive audio, like you'd use for PSK31 and other digital modes.
A five-minute recording should give me enough to decode the format of the Clock subcode (I need to find the start, then see it increment). The longer the recording, the better, though. Several ten-or-so minute recordings over a few days would be the gold standard, but I'm not going to push my luck here
Can anyone help a struggling engineer with a crazy project?
Cheers,
Phil.