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Author Topic: Not sure what this is....  (Read 1341 times)

Offline mapleleaf

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Not sure what this is....
« on: November 22, 2011, 1120 UTC »
First noticed at about 1100Z about 6770. Carrier appeared for about 10 seconds then stops and restarts immediatley 3 khz higher.
Has contunued and is now at 6930.

Some kind of propagation sounder maybe?

http://dl.dropbox.com/u/45626319/Screenshot-2011-11-22-072234.png
« Last Edit: November 22, 2011, 1125 UTC by mapleleaf »

Offline ChrisSmolinski

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Re: Not sure what this is....
« Reply #1 on: November 22, 2011, 1313 UTC »
Funny, I noticed the same exact thing the other day. No idea what it is.
Chris Smolinski
Westminster, MD
eQSLs appreciated! csmolinski@blackcatsystems.com
NRD 545 / netSDR / AFE822x / AirSpy HF+ / KiwiSDR / 670 ft horizontal loop / 500 ft northeast beverage / 270 ft west-south-west beverage / 300 ft south beverage / 43m / 20m / 10m  dipoles / Crossed Parallel Loop

Offline Token

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Re: Not sure what this is....
« Reply #2 on: November 22, 2011, 1948 UTC »

Some kind of propagation sounder maybe?


I rather doubt a sounder of some kind.  In general there needs to be some kind of modulation on a sounder or a swept rate that is known.  A dead carrier jumping in 3 kHz steps would not be able to be distinguished from CW (honest CW here, not talking code) noise on the frequency, so there would be too much likelihood of false data.

I see you have the Chinese OTHR at the lower half of the waterfall, a sounder on about 6971 or so, but what is that on 6980?  It looks too narrow to be a Chinese 4+4 modem.

T!
T!
Mojave Desert, California USA

Offline ChrisSmolinski

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Re: Not sure what this is....
« Reply #3 on: November 22, 2011, 2101 UTC »
The one I noticed was stepping across the entire 6800-7000 band I was monitoring on the SDR. I don't recall the exact step size or rate. Presumably it was operating below 6800 and above 7000 as well.
Chris Smolinski
Westminster, MD
eQSLs appreciated! csmolinski@blackcatsystems.com
NRD 545 / netSDR / AFE822x / AirSpy HF+ / KiwiSDR / 670 ft horizontal loop / 500 ft northeast beverage / 270 ft west-south-west beverage / 300 ft south beverage / 43m / 20m / 10m  dipoles / Crossed Parallel Loop