Re: LF: OP32Ds decode UW8SM <?>

[Laurence KL7 L <hellozerohellozero@hotmail.com>]

Thanks Markus - we do have the occasional carrier incursion from various power metering Turtle systems but I see what you mean. Ive been running the rx system for a few months and this was the first so far this year on Opds save for JA - the Transpolar openings have been rarer than rocking horse poop.

The sun just keeps up on topping up nasty particles -

Appreciate the software- another excellent tool. Coming up to the best times to Eu over the pole so fingers crossed we get a quieter period, and less of the X files incursions.

Laurence KL7l

On Dec 20, 2014, at 11:30 AM, "Markus Vester" <markusvester@aol.com> wrote:

Laurence,

 

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)

From: Laurence KL7 L

Sent: Saturday, December 20, 2014 8:06 PM

To: rsgb_lf_group@blacksheep.org

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