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Author Topic: UNID 6920 ~ 6966 0338 13may16 UTC  (Read 1922 times)

Offline Tom Hooper

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UNID 6920 ~ 6966 0338 13may16 UTC
« on: May 13, 2016, 0342 UTC »
What was covering up that much spectrum??? It lasted for ~5 minutes or so (that I saw).
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Offline EliteData

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Re: UNID 6920 ~ 6966 0338 13may16 UTC
« Reply #1 on: May 13, 2016, 1502 UTC »
out of curiosity, can you post a waterfall screen shot ?

Offline ChrisSmolinski

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Re: UNID 6920 ~ 6966 0338 13may16 UTC
« Reply #2 on: May 13, 2016, 1715 UTC »
I copied it here as well, it was observed just after the Radio Metallica World Wide transmission on 6955 LSB, which you can see on the waterfall. It was on from 0334-0339, covering about 6920-6968 kHz.


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Offline MDK2

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Re: UNID 6920 ~ 6966 0338 13may16 UTC
« Reply #3 on: May 13, 2016, 1808 UTC »
I wasn't listening in then, but I'm curious about those other steady signals at 6845 and 6895. What are they?
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Offline Tom Hooper

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Re: UNID 6920 ~ 6966 0338 13may16 UTC
« Reply #4 on: May 13, 2016, 1914 UTC »
Chris, Yeah, that looks like it but obviously I wasn't paying attention to the time - I just looked up at the monitor and saw it there.
I need to get serious and figure out how to record the SDR-IQ using SpectraView.

DataElite - No, I was doing something else at the time and didn't grab a screen shot but see the shot that Chris posted - that's what I saw.

There seems to be more strange sigs in that part of the spectrum now that Bro. $care has moved.
I usually leave the rcvr centered on 6925, with MMSSTV also running, while I'm putzing around doing other things or sleeping...
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Offline ChrisSmolinski

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Re: UNID 6920 ~ 6966 0338 13may16 UTC
« Reply #5 on: May 13, 2016, 1949 UTC »
There seems to be more strange sigs in that part of the spectrum now that Bro. $care has moved.
I usually leave the rcvr centered on 6925, with MMSSTV also running, while I'm putzing around doing other things or sleeping...

Keep an eye on 6914, it has been active again, this time with RTTY sent in AM mode (I've logged it here: http://www.hfunderground.com/board/index.php/topic,27988.0.html )
Chris Smolinski
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Offline Token

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Re: UNID 6920 ~ 6966 0338 13may16 UTC
« Reply #6 on: May 13, 2016, 2332 UTC »
I copied it here as well, it was observed just after the Radio Metallica World Wide transmission on 6955 LSB, which you can see on the waterfall. It was on from 0334-0339, covering about 6920-6968 kHz.

Chris, do you have a short audio clip of that wide signal?  Even a relatively narrow 3 kHz wide rec would go a ways towards ID.

Off the top of my head, and without having heard an example of this one, I would say it might be one of the three or four new'ish wideband data modes being seen on the HF bands these days.  There is a 48 kHz wide mode that is sometimes seen with narrow band, roughly 3 kHz wide, bursts before or after it, and in this case it looks like there may be one both before and after.

On the other hand, there appears to be a lot of OTHR jumping around in that band at that time, so that is also possible.

T!
T!
Mojave Desert, California USA

Offline ChrisSmolinski

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Re: UNID 6920 ~ 6966 0338 13may16 UTC
« Reply #7 on: May 14, 2016, 0003 UTC »
Token,

Here's a short 5 kHz wide, USB, recording: http://radiohobbyist.org/blog/mypics/6940.0-05132016-033615.mp3
Chris Smolinski
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Offline Token

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Re: UNID 6920 ~ 6966 0338 13may16 UTC
« Reply #8 on: May 14, 2016, 0159 UTC »
Sounds like PSK to me, my bet is one of the wideband data signals.

T!
T!
Mojave Desert, California USA

Offline Token

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Re: UNID 6920 ~ 6966 0338 13may16 UTC
« Reply #9 on: May 14, 2016, 0207 UTC »
I wasn't listening in then, but I'm curious about those other steady signals at 6845 and 6895. What are they?

I have logged STANAG 4285 (a digital modem) on both 6843 kHz USB and 6895 kHz USB.  Without recorded examples I cannot be sure that is what is on this waterfall, but I would be willing to bet that is what is on the waterfall.

T!
T!
Mojave Desert, California USA