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211
Other / Intruder dashes on 29679.9 kHz, Dec 17, 2014
« on: December 17, 2014, 1634 UTC »
For the last couple days I have been hearing dashes on about 29679.9 kHz, the frequency does appear to move around a little.  I first noticed them about 2300z on Dec 16, and they are still up right now, 1530z Dec 17.

The dashes appear to be spaced about every 2.35 seconds, and they are roughly seconds 0.46 seconds long.  There is either some kind of modulation on the first 0.06 seconds of the pulse, or it takes the transmitter that long to settle.  About 0.06 seconds further into the pulse (roughly 0.12 sec from start) there is a further glitch.  The pulse is stable for the remaining time it is on, about 0.32 sec.

T!

213
This board is about identifying mystery or unknown modes heard in the HF spectrum.  If you donít know what a signal is there is a good chance that others might know, or at least be able to take a good guess.  As signals are identified here they will be added to the HF Signals Identification Wiki here (  http://www.hfunderground.com/wiki/Signal_Identification  ) on HFU (if they are not already on it).

The purpose of this board is not to ID unknown transmission, but rather the mode of a transmission.  That means those odd noises you always wondered about as you tuned across the bands.  If you hear an unknown SSB net or unknown ALE net and want to know who it is or where it is from it should not be addressed here, the mode of those transmissions are already known, and there are other boards on HFU to ask such questions.  However, if you hear a signal that you cannot identify the mode of, and it turns out to be ALE, this is the perfect place for that.  There will be some overlap here, but letís try to stay with unknown modes as much as possible.

Not everyone has the same level of exposure in a hobby such as this, so it is understandable, in fact inevitable, that occasionally someone will ask about a mode that has already been covered or seems very basic.  So what?  As long as the person asking the question goes away with more information than they started with, it is all good.

Keep in mind that the folks answering here typically are not professionals and might not know either, so if you get no answer that does not mean you are being ignored.  Sometimes unknown stays unknown, but that does not mean a discussion about it does not shed at least a little light on it.  And a lot of people only check these boards every once in a while, so your question might not be answered right away.

What should be in a post?

Without certain basic data a mode cannot be identified.  The more data you can include in your post the more likely the mode is to be correctly identified.  For example, asking a vague question like ďI heard a clicking noise in the 8 MHz band, what is it?Ē will probably not result in a meaningful answer.

The minimum information presented with a question should be:

1.  Frequency (kHz)
2.  Time (UTC)
3.  Duration
4.  Receiver Mode
5.  Receiver Location
6.  Description.

1.  Frequency of the signal, preferably in kHz.  Be as precise as you can be here, sometimes one or two kHz can be the difference between a proper ID and a false ID.

2.  Time of the reception, in UTC.  Radio reports are almost universally done in UTC or GMT anyway, it avoids confusion.  If you post it in your local time then whoever wants to answer has to convert to UTC to get an idea of when it was, and they may not know your location or the proper time offset for your location.

3.  Duration of the transmission.  Was this a signal that stayed on constantly?  Or did it come and go in short bursts?

4.  Receiver mode you were using when you heard the signal.  Sometimes when people do not know what a signal is they use an incorrect mode to try and listen to it.  A signal will often sound different depending on what mode you use to listen to it.

5.  Location of receiver.  This does not have to be exact information, but signals that might be heard on 8000 kHz at 2300 UTC on the west coast of the US are a little different than the ones that might be heard at the same time in Jalalabad.  If you are using a remote receiver than your location is not the one that counts, but rather the location of the receiver is what needs to be known.

6.  Your description of what you heard.  What did it sound like?  What do you think it might be?  Even if you donít know what it is it canít hurt for you to say what it sounded like.



In addition to the above minimums there is additional information that can increase the likelihood of a correct identification.

If using a local radio, what is your receiver and antenna?

It is very desirable for you to include a link to a video or audio recording of the signal in question.  Including a recording increases the chances of a correct identification significantly, I cannot stress enough how helpful to ID this is.  If you are unsure what receiver mode to record the audio in, try a couple of them.  Unfortunately it is not always possible to make such a recording.

A picture of the transmission goes a long way.  If you are using an SDR a screen shot of the waterfall display is a big help.  If you are using a traditional receiver a screen shot of the audio fed into some kind of spectral display software, like Argo, fldigi, SpectroGram16, etc, is a good thing.

214
YHWH up with intro music at 0259 UTC, December 01, 2014, on 11595 kHz, AM.

T!

215
UnIDed station 6925.1 AM, started 0119 UTC, Dec 01, 2014, but I did not have time to get back to it for a while.

S5 and sometimes unusable.  May have IDed a few times, but if so I missed it.

0208 UTC, Tone Loc, I recognize the song but don't remember the name
0211 UTC, Tone Loc, Wild Thing
0215 UTC, Metallica, Whiskey in the Jar
0221 UTC, sounded like maybe an ID, but way to far in the noise for me to hear
0222 UTC, off air

T!

216
General Radio Discussion / HFU Signals identification Wiki
« on: November 30, 2014, 0214 UTC »
This thread over here got me thinking ->  http://www.hfunderground.com/board/index.php/topic,19628.0.html

That Wiki linked in the thread is a nice attempt to put together a tool that listeners can use to identify signals they may come across on a receiver.  While it appears to be specifically aimed at RTL SDR users it could help a broader base.  Unfortunately, as I said in that thread, it appears to have been laid out and the data largely populated by new users to the hobby.  There is nothing wrong with being a new listener, everyone starts out at zero and builds from there.

Now this group on HFU is a bright ....  errr  ..... friendly .... errrrrr .... diverse group of hobbyist, ranging from old hands to newbs.  And as Chris said in the other thread, HFU has a Wiki of its own.  Why not build on the knowledge of the users here and see if we can put together an HF signals identification page with a bit more depth?

But before we start slapping a page together I thought it might be a good idea to float a thread here to arrive at a basic structure and what the contents should be.

So lets put suggestions in this thread towards a basic architecture.  Once we have enough for a basic framework Chris can start the initial entries and we can fill it in.  From that point we can adjust as needed, improving as we go.

T!
I also think it would be a good idea to get suggestions on modes to include in the identification table.

217
I have generated a new prediction chart for V24.  It can be found here http://www.tokenradio.net/Radio/SharedFiles/NumbersTfer/V24_M94_latest_sched.JPG

Past charts for V24, M94, and V07 can be found on the index page here:  http://www.tokenradio.net/Radio/SharedFiles/NSTfer.htm

T!

218
YHWH up with intro music at 1800 UTC, November 1, 2014, on 11595 kHz, AM mode.

A poor choice of freq for this time of the day and conditions that exist today.  Up at 20 meters or above he could be into Europe easy.

T

219
YHWH with sign on music, 0158 UTC, November 1, 2014, 0158 UTC.

T!

220
YHWH up with sign on music at 0152 UTC, 11595 kHz, AM mode, October 31, 2014.

T!

221
YHWH on with music and sign on at 0200 UTC, 11595 kHz, AM mode, October 30, 2014.

(edit)  Off 0304 UTC

T!

222
Tuned to YHWH on 11595 kHz, AM mode, 0151 UTC, October 29, 2014.

T!

223
Tuned in to broadcast in process, YHWH on 11595 kHz, AM mode, October 28, 2014, 0140 UTC.

T!

224
YHWH up with intro music on 5795 kHz, AM mode, October 27, 2014, 0202 UTC.

When he first came up on freq he was on 5794.7 kHz, and then shifted up to 5797 kHz during the song.  Prior to all of that he was up on 25750 kHz area, sliding around to 25800 and 25700 at different times.

T!

225
YHWH up with sign on at 0158 UTC, October 25, 2014, on 11600 kHz, AM.

T

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