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It's certainly NOT what I'm talking about. It isn't an audible noise. I only discovered it during spectral analysis. I was then able to do a band pass filter from 5400 to 6000 hz. Only then could I hear it. On other Cuban ones it has a certain pattern. I'll have to make some recordings and screenshots to show you Sent from my iPhone On Aug 29, 2010, at 10:13, Nick Smith <[email protected]> wrote: > Visit http://mailman.qth.net/mailman/listinfo/spooks to unsubscribe from this > list > > I'm not sure if I understand what you mean. > To clarify, the noise only occurs when my computer is doing certain things. > If Baudline is minimized or if I'm using another program to record, for > example, there will be no noise. If Baudline is visible, then there is noise. > My serial port, the one that is used to control my radio, will sometimes make > noise too; it is audible in until 15 seconds from the start in > http://eepromeagle.dyndns.org/e2kfiles/RHCwRing-6000kHzAM-20091021-0448UTC.wav > , which is the file you filtered. > > > When I recorded V13, I was using SoX ( http://sox.sourceforge.net/ ) and I > was using a software loopback, so that would explain why there was none of > the noise in those. > > Hope that explained it and I hope I understood. :) > > > Jochen : Glad to hear that I got the timing and frequencies right! :) > > > Best regards, > Nick Smith > > --- On Sun, 8/29/10, Ryan Kirby <[email protected]> wrote: > >> From: Ryan Kirby <[email protected]> >> Subject: Re: [Spooks] Information on V2a/M8a/SK01/Radio Habana Cuba ringing >> sound >> To: "Shortwave Spy Numbers Stations" <[email protected]> >> Cc: "Shortwave Spy Numbers Stations" <[email protected]> >> Date: Sunday, August 29, 2010, 2:40 PM >> Visit http://mailman.qth.net/mailman/listinfo/spooks to >> unsubscribe from this list >> >> I thought it was noise from equipment at first too. Upon >> examining other clips you sent me the info I was seeing in >> spectral analysis doesn't cut thru all of the clips. In fact >> it's only in the Cuban ones and in other clips it's only >> where the news caster is speaking. >> >> Sent from my iPhone >> >> On Aug 29, 2010, at 5:15, Nick Smith <[email protected]> >> wrote: >> >>> Visit http://mailman.qth.net/mailman/listinfo/spooks to >> unsubscribe from this list >>> >>> Nice to talk to you again. I didn't notice the naming >> mistake until much later. :) >>> >>> Interesting. I never thought about the possibility of >> it being an announcement that their is encoded information >> in the broadcast. >>> >>> If I understand correctly, I produced the simulation >> in a very similar way to what you described. In the Baudline >> tone generator ( >> http://www.baudline.com/manual/tone_generator.html#tone_generator >> ), I set the maximum tone to 777.10Hz and the minimum tone >> to 621.83Hz (both sine wave), set the modulation to FM, set >> the modulation function to square, and then set the >> modulation frequency to 7.143Hz. >>> >>> This made it switch between the two frequencies at a >> rate of 7.143Hz. >>> >>> >>> >>> The 5600Hz signal... I see something closer to 5425Hz. >> If that's what you meant, then that would be noise produced >> by my soundcard or motherboard. >>> >>> Best regards, >>> Nick Smith >>> >>> --- On Sat, 8/28/10, Ryan Kirby <[email protected]> >> wrote: >>> >>>> From: Ryan Kirby <[email protected]> >>>> Subject: Re: [Spooks] Information on >> V2a/M8a/SK01/Radio Habana Cuba ringing sound >>>> To: "Shortwave Spy Numbers Stations" <[email protected]> >>>> Date: Saturday, August 28, 2010, 11:11 PM >>>> Visit http://mailman.qth.net/mailman/listinfo/spooks to >>>> unsubscribe from this list >>>> >>>> With those stations with a lot of spoken word >> (i.e. news >>>> casts) its >>>> possible they are using the spoken equivalent to a >> book >>>> cypher, but I >>>> cant figure out the purpose of the ringing if this >> is the >>>> case. Other >>>> than the ringing could indicate that there is an >> intended >>>> message in >>>> that portion of the news cast. Since verbal/book >> cyphers >>>> are >>>> impossible to crack without the key (nothing's >> impossible, >>>> but there >>>> is too many possibilities in any spoken/written >> word) it >>>> would make >>>> sense if they chose to do that. >>>> >>>> The other thing is that the ring appears to be a >> result of >>>> a single >>>> square wave form oscillator, with the LFO set >> square as >>>> well. This is >>>> a good choice ensuring a message gets across (if >> the >>>> ringing is the >>>> medium). The technique for that would be to set up >> a >>>> receiver with a >>>> modular signal amplifier with the gain set high. >> Then use a >>>> technique >>>> called comb filtering to filter out all of the >> frequencies >>>> OTHER than >>>> the frequencies of the ringing. You could easily >> do this >>>> with a >>>> analog/digital rackmount EQ. >>>> >>>> The human voice works on several frequencies, and >> just like >>>> other >>>> natural noise, as a very large set of harmonics. >> The >>>> downside to the >>>> voice, etc, over the radio is RFI or other forms >> of signal >>>> degradation >>>> may effect the frequencies of those harmonics, >> which will >>>> cause the >>>> voice (or whatever) to be not understandable. This >> is why >>>> in those >>>> recordings, it may be hard to hear the voice >> properly, but >>>> the ringing >>>> cuts through very well. There is no overtones or >> harmonics >>>> with >>>> signals produced by oscillators (unless you use >> multiple >>>> oscillators >>>> just to create harmonics/overtones.... now I'm >> going off >>>> topic). >>>> >>>> Here's an example using Nick's Recordings, using >> the comb >>>> filtering >>>> technique on the frequencies he listed. >>>> http://www.megaupload.com/?d=AJWZY33X >>>> >>>> Spectral analysis shows nothing odd about the ring >> or >>>> voice... But at >>>> ~5600hz there is a constant burst... kinda like a >> constant >>>> binary >>>> 0101010101 pattern all the way through. It >> modulates at a >>>> very high >>>> frequency and due to the constant pattern I can >> say that >>>> there is no >>>> analog transmission of data on this frequency. >> This pattern >>>> does occur >>>> at a few other frequencies as well. The odd thing >> about it, >>>> is it >>>> doesn't seem to be due to interference. It could >> be a >>>> result of their >>>> broadcasting equipment, or a result of the >> recording >>>> equipment, >>>> however. The only odd thing about it, is that >> it's >>>> occurring on ONLY >>>> those frequencies. >>>> >>>> >>>> Just my findings. >>>> >>>> Ryan >>>> >>>> On Sat, Aug 28, 2010 at 1:16 AM, Nick Smith <[email protected]> >>>> wrote: >>>>> Visit http://mailman.qth.net/mailman/listinfo/spooks to >>>> unsubscribe from this list >>>>> >>>>> Almost a year old now (October 2009), but in >> the >>>> interest of adding content, here is something I >> wrote. I >>>> originally sent it to the ENIGMA2000 group, so >> that's why >>>> you'll see references to "e2kfiles." >>>>> >>>>> >>>>> Information on >> V2a/M8a/SK01/Radio Habana >>>> Cuba ringing sound >>>>> I use a Ten-Tec RX320D and an indoor antenna >> that is a >>>> few feet longer than 100 feet (30.48 meters) and >> used >>>> Baudline ( http://www.baudline .com/) for analysis >> of the >>>> frequencies and tone length. >>>>> >>>>> Ringing: >>>>> Ring high tone : 777.10 Hz >>>>> Ring low tone : 621.83 Hz >>>>> Ring tone length : 0.0700 Seconds >>>>> Ring tone High-Low cycle length : 0.1400 >> Seconds >>>>> Ring High-Low rate : 7.1428571 Hz >>>>> >>>>> Unknown low tone : 466.55 Hz >>>>> >>>>> [Note: Frequencies and times were measured >> with a >>>> cheap internal sound card. They are probably not >> totally >>>> accurate.] >>>>> >>>>> With this information, I've made a simulation >> of the >>>> ringing. It is available here: >>>> http://eepromeagle.dyndns.org/e2kfiles/ringsimulation.wav >>>>> >>>>> The ringing will sometimes be longer or >> shorter than >>>> usual. However, I have not checked the length of >> each ring >>>> to see if a certain ring length corresponds to a >> certain >>>> number (like the XP stations, but with time >> instead of >>>> frequency). >>>>> By ear, the tones themselves seem to stay >> pretty much >>>> constant in length somewhere near the measured >> 0.0700 second >>>> length, and it's the number of times the high-low >> (or >>>> low-high) cycles repeat that changes. Listening to >> my >>>> recordings, in one of the rings, the length of the >> first >>>> tone in the ring sounds like it is shorter. I'm >> not sure if >>>> this was an error when I was recording or if it >> really was >>>> shorter. >>>>> >>>>> There is often a really low tone (the "Unknown >> low >>>> tone" as specified above) that is sometimes >> present with the >>>> ringing and will sometimes stop and start. This >> could be >>>> just RFI, but I thought it'd be worth mentioning. >>>>> >>>>> I saw something about this on the list, but >> on >>>> 2009-10-21 at 04:48UTC on 6000kHz, I heard the >> same ringing >>>> sound on Radio Habana Cuba. I made two recordings >> of that: >>>> http://eepromeagle.dyndns.org/e2kfiles/RHCwRing-6000kHzAM-20091021-0448UTC.wav >>>> and >>>> http://eepromeagle.dyndns.org/e2kfiles/RHCwRing-6000kHzAM-20091021-0455UTC.wav >>>> . >>>>> >>>>> I also made a good recording of SK01 with very >> loud >>>> ringing (some QRM though) on 2009-10-13 at >> 09:33UTC on >>>> 5930kHz AM, which you can find here: >>>> http://eepromeagle.dyndns.org/e2kfiles/SK01-5930kHzAM-20091013-0933UTC.wav >>>> (warning : it is almost 150MB. I recorded it with >> a sample >>>> rate of 48000 kHz even though I was using a filter >> that >>>> appears to filter off anything above 4.5kHz) >>>>> I might have recorded it in SSB and forgot to >> change >>>> the filename (my radio is around 53Hz off >> frequency in SSB >>>> without correction). I think I had the radio tuned >> somewhere >>>> around 53Hz below 5930kHz to correct for >> inaccuracy though. >>>>> >>>>> Here is another one with loud ringing as well >> as the >>>> low tone (you can hear it make a "dah-dit-dah" >> noise near >>>> the middle) 2009-10-13 at 09:32UTC on 5947kHz LSB: >> http://eepromeagle.dyndns.org/e2kfiles/SK01-5947kHzLSBaAM-20091013-0932UTC.wav >>>>> I did switch modes near the middle of the >> recording, >>>> so there are some loud beeps. It was recorded in >> LSB, not >>>> sure if I corrected it or not. >>>>> >>>>> I may have written down the frequencies and >> times >>>> incorrectly for the recordings since I probably >> mistyped >>>> some of the filenames. I normally keep logs with >> accurate >>>> data that are separate from the recordings, but >> when trying >>>> to switch frequencies and start more recordings >> fast, it was >>>> kind of easy to make mistakes. >>>>> >>>>> >>>>> >>>>> >>>>> >>>> >> ______________________________________________________________ >>>>> Spooks mailing list >>>>> Home: http://mailman.qth.net/mailman/listinfo/spooks >>>>> Help: http://mailman.qth.net/mmfaq.htm >>>>> Post: mailto:[email protected] >>>>> >>>>> This list hosted by: http://www.qsl.net >>>>> Please help support this email list: http://www.qsl.net/donate.html >>>>> >>>> >> ______________________________________________________________ >>>> Spooks mailing list >>>> Home: http://mailman.qth.net/mailman/listinfo/spooks >>>> Help: http://mailman.qth.net/mmfaq.htm >>>> Post: mailto:[email protected] >>>> >>>> This list hosted by: http://www.qsl.net >>>> Please help support this email list: http://www.qsl.net/donate.html >>>> >>> >>> >>> >>> >>> >> ______________________________________________________________ >>> Spooks mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/spooks >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[email protected] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >> ______________________________________________________________ >> Spooks mailing list >> Home: http://mailman.qth.net/mailman/listinfo/spooks >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> > > > > > ______________________________________________________________ > Spooks mailing list > Home: http://mailman.qth.net/mailman/listinfo/spooks > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Spooks mailing list Home: http://mailman.qth.net/mailman/listinfo/spooks Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
