Re: LF: Weak signal on 137780.3

[<jrusgrove@comcast.net>]

Markus

 

The mystery signal was from WD2XNS ... you have the time and frequency perfectly correct and the color DF also provides corroborating evidence. Note that there was no break in the transmission. The frequency is controlled by a GPS disciplined oscillator (accuracy about 13 ppt). Transmitter power was 200 watts ... radiated power is not known. During winter, with frozen ground, additional radials, lower R and less foliage, the radiated power would have been about 0.5 watt. Expect last night's test would be at least 3 - 6 dB (maybe more) below that level.

 

Jay W1VD  WD2XNS  WE2XGR/2

 

   

----- Original Message -----

From: Markus Vester

To: rsgb_lf_group@blacksheep.org

Sent: Sunday, September 04, 2011 4:45 AM

Subject: Re: LF: Weak signal on 137780.3

The mystery signal was received between about 0:15 and 3:30 on 137780.310, with a 3.8 mHz downward shift from about 1:30 to 2:15 - somewhat reminiscent of a DFCW "GM". Greenish colour indicates southwesterly origin. The attached  screenshot was taken at 8 UT, timescale is 10 minutes per FFT.

 

I checked the other available TA grabbers around 4 UT, but no trace of the mystery signal.

 

73, and have a nice sunday,

Markus (DF6NM)   

From: Markus Vester

Sent: Sunday, September 04, 2011 5:39 AM

To: rsgb_lf_group@blacksheep.org

Subject: LF: Weak signal on 137780.3

LF,

 

there seems to be a signal on 137780.300 Hz, about 60 nV/m here.

http://www.alice-dsl.net/df6nm/grabber/TAnarrow.jpg

 

Wondering whose it may be...

 

Best wishes,

Markus