11.175 usb

[instrumentphilip]

Right now hearing short either data transmissions, Jamming, or some short of radar something. It sounds like HAARP, or the woodpecker sort of sound. I am hearing it about every several minutes very active.

Any help as to what it is? I know it is a GHFS frequency, but I am wondering what exactly it is I am hearing. the woodpecker sound is 4 or 6 seconds long.

 

[CalebATC]

Nevermind, I was totally wrong. Look at Tokens response!!

 

[Token]

This is not HAARP and it is not the Woodpecker, just rather a run of the mill HF Radar or sounder of some kind, it is essentially impossible to say with authority which exact model it is (at least, what I am hearing periodically hitting 11175 right now as I type this is). Pretty much a regular across the bands. Recently, as in the past week plus, there has been a CODAR like radar hitting the 11175 freq pretty steady, but that does not last for only 4 to 6 seconds, it runs for minutes or hours at a time.

Just as an aside, the Woodpecker has not been active for more than 20 years, and when it was it sounded nothing like any of the OTHRs currently on the band with the possible exception of a slowed down SuperDARN. The Woodpecker was a simple single PRI, single PW, (both of those being simple in radar terms, yes it had multiple PWs and PRIs, but not on a pulse-to-pulse basis) pulse radar and most of todays HF RADARs involve some kind of chirp, FM, IFM, or FMCW modulation, with others including PSK and FSK in the mix.

T!

 

[instrumentphilip]

Yes yes yes, I know it is not HAARP and it is not Woodpecker, I am not trying to get into some sort of conspiracy meltdown discussion. I am just saying that that is the only kind of sound that it reminded me of. And okay you are hearing it too then, all the way out in California?

Yeah well what I am hearing sounds like that radar sort of sound but for me it is coming in short less than 10 seconds intervals. And it's just me but wouldn't this , what ever it is be interfering with GHFS? Since it is bleeding on that frequency?

 

[Token]

Yes I am hearing it in California, but we are talking HF here and 11 MHz, it is potentially World wide on a good day.

Yes, it would probably be interfering with HF-GCS on 11175. Now, would it be enough to be more than just a minor annoyance? I can't say, but from my end that is all it is right now. By the way, the radar that was hitting 11175 when I wrote my first response is no longer hitting it, but something that looks like SuperDARN now is. In fact, SuperDARN (or whatever this is that acts like SD) is hammering all around 11175, jumping around from 11125 to 11225 and it is more than one radar, it looks like at least 2 of them.

HF is often fraught with other signals hitting your communications, it is kind of the nature of the beast. The USAF may not like a radar hitting one of its frequencies, but that does not mean the radar operator cares what the USAF likes or dislikes. And it is not bleeding on the frequency, it is flat out hitting it dead center at times.

T!

 

[instrumentphilip]

Just googled SuperDARN, sounds like another HAARP. I also heard something on 13.200 , sounded like a number message with a couple of Bravos and Novembers thrown in.

 

[brandon]

Here are some noises heard today around the 11 meg range. Do any of them sound like what you monitored?

 

[instrumentphilip]

Here are some noises heard today around the 11 meg range. Do any of them sound like what you monitored?

Yup the noise near the end that starts at 13 seconds sounds like what I heard. and for the right amount of time that it lasted too. Except with me I got a lot louder of a signal of that noise.

 

[Token]

Yup the noise near the end that starts at 13 seconds sounds like what I heard. and for the right amount of time that it lasted too. Except with me I got a lot louder of a signal of that noise.

The signal in the last half of brandons audio example is SuperDARN. Looking at it on an o'scope the pulse spacing is very distinctive, and the sound is fairly unique also.

T!

 

[CalebATC]

Ah, Ok, I see what it is. I thought you were talking about a different type of noise. I bet that is all over the waterfall!

 

[Token]

Here is a picture of what it looks like on a waterfall with SuperDARN hitting around. This image is centered about 11455 kHz and is about 105 kHz wide. I would have taken a shot of SuperDARN around 11175 but by the time I got around to it the radar had moved freq.

The image includes SuperDARN hits and some other kind of radar or sounder. It also includes an SW broadcast station in AM mode and some communicatins in USB. It was taken at 0243 UTC on March 24, 2011.

A larger version of the same image can be found here, but it is a fairly large picture:
http://www.pbase.com/token/image/133385554/original.jpg

T!

 

[instrumentphilip]

... Interesting.

 

[Token]

For clarity I redid that same waterfall image, this time including numbers near each SuperDARN hit. The numbers correspond with the sequence of hits, number 1 being the first burst on the waterfall and number 12 being the last in this particular 50 second capture.

Again, this image is a waterfall showing SuperDARN transmissions jumping around in a specific band. The image is centered on about 11455 kHz and shows a band about 105 kHz wide. As there are no burst overlaps this is most likely a single SuperDARN site, but it is not unheard of for more than one site to be hammering a specific frequency range at the same time, in that case you would expect to see some burst overlapping in the time domain. The different power levels exhibited in this capture are indicative of SuperDARN dynamically looking in slightly different directions for each burst.

This is the same image as before taken March 24, 2011, 0243 UTC, just with the numbers added, so it still includes the communications in USB on the low frequency (left) side and the SW broadcast station in AM mode on the high frequency (right) side and the other OTHR/sounder.

And again, the larger, more detailed, image (but with sequence numbers) can be found here:
http://www.pbase.com/token/image/133389674/original.jpg

T!