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Re: LF: OP32Ds decode UW8SM <?>

To: <[email protected]>
Subject: Re: LF: OP32Ds decode UW8SM <?>
From: "Markus Vester" <[email protected]>
Date: Sat, 20 Dec 2014 21:28:22 +0100
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UW8SM is usually a strong signal here but no indication of a transmission at that time and frequency, so almost certainly a false positive.
Opds detections with correlation marginally above 15 dB are generally a bit suspicious, especially if accompanied by fairly good carrier SNR (ie. better than 45 dBOp or so). This usually indicates that opds has locked on some spurious carrier, eg another transmission or a Loran line, and the modulation or noise around it happened to resemble one of the listed callsign patterns. If you have a well calibrated frequency readout (better than a couple of milliHz), you can configure opds to ignore lines from specific Loran chains.
Best 73,
Markus (DF6NM)

Sent: Saturday, December 20, 2014 8:06 PM
Subject: LF: OP32Ds decode UW8SM <?>

Not sure but this decoded - cant see any parallel times decoding on Opera live - just after my dawn yesterday =- don't think its "real" <?> Especially given magsol over the past 48 hours, but stranger things have happened
    date      time   call   distance  frequency bandwidth  snr    correlation
2014-12-19 20:37:37 UW8SM   7738km 137533.126Hz   3mHz -42.9dBOp  71% 15.0dB
Laurence KL7L BP51IP
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