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47.9 MHz: Chile!

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  • 47.9 MHz: Chile!

    Hi

    As you may know, I had no idea that the $7 scanner I got at a yard sale covered 30-50 MHz.

    mrhoover sent me a PM with a list of Chilean Muzak stations, the strongest being in Santiago on 47.9 w/ 5000 watts.

    I had no other DX, so I thought I'd give the scanner a shot, never thinking I'd really *hear* this thing....but sure enough!!

    This has to be >5000 miles.

    This is fantastic. Keep in mind that there was no spoken-voice, just music, with long silent periods in between. mp3 coming.....

    Hugh was a big help here, and my wife helped by turning the thing off while I was at work!

    cd

  • #2
    Very interesting, Christopher.
    Danny
    Shreveport, LA
    Mexico/Latin America TV DX ID Tips http://www.tvdxtips.com
    Submit and read DTV Stats http://www.tvdxexpo.com/dtvdxrecords.html
    TV and DTV DX Photographs http://www.tvdxexpo.com
    My Photographs of 100 Mexico TV DX Local IDs http://www.tvdxexpo.com/100mexicotvids.html
    More than 1,100 TV logs since 1994

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    • #3
      I am really unfamiliar with TEP or F2 propagation. Sherlock had a guy in south FL working Chile via F2, so I thought I'd try. This was using, of course, my CM3020. I have no discones or whatever.

      I asked Hugh if this is common....he said witht the sunspot cycle, it should still be coming in until summer, and it'll come back in Sept/Oct. I still don't know if this was F2 or TEP. I am hoping that the sound of the mp3 will tip it off!

      Also I heard a "sweep" (like a shriek) a couple of times. It's on my tape as well.

      cd

      Comment


      • #4
        Youtube video of 47.9 recorded in Brazil

        http://www.youtube.com/watch?v=IAJAJO4smdI

        Another antenna to cover these lower frequencies is a good idea.I think I remember that Mike B found that his lowband antenna had almost no gain on E2 video 48.25 MHz,the whip antenna on his scanner working better which would mean that the Chilean signal you had would have been a lot stronger than you actually heard it.

        The antenna doesn't need to be anything "exotic" a vertical dipole cut to 47 MHz or so willl give omni directional coverage.A simple 50 MHz 6 metre antenna is another option,doesn't need to be very high.

        There's a list of the Chilean musak stations here http://www.qsl.net/ce3sad/6m.html some use narrower FM like 47,9 MHz,others are wider.

        It's possible with some sporadic E to assist this month the signals may get further north.

        Hugh
        Last edited by mrhoover; 05-03-2011, 11:18 AM.

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        • #5
          47.9 audio

          Here are 2 clips of the 47.9, endings of 1 song into beginnings of another.....note the long pauses.

          Also a buzz-sweep clip.

          Can anyone tell the difference, whether TEP or F2?

          cd

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          • #6
            Hi

            You won't "hear" a difference between Afternoon TEP and F2.
            Evening TEP is different,there's very rapid flutter on the signal
            it generally doesn't travel quite as far northwards but the MUF goes higher.

            Hugh

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            • #7
              Thanks for your info Hugh. BTW it's "only" 4,159 miles. No biggie then.

              cd

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              • #8
                When these were first "discovered" in the late 1990's (Cycle 23) it took a while to pin down where they were from. For a while they were thought to be STLs (low power) rather than actual (high power) broadcasting stations. http://www.youtube.com/watch?v=aoGvO0wU2Vs

                My IC-551D (which died in Feb 2001) didn't have FM and required a "trick" to get it to tune below 50 MHz. At one time I was using the old Allied A-2586 (wider bandpass) with a 50-MHz preamp (a T-connector to split its output) and the 5-el 6m beam to listen to them. It's so much easier with the FT-847!

                73, Pat - WA5IYX

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                • #9
                  So then, what make/model can be recommended for 30-54 MHz, and would it be worth it to get it now, or wait until a bigger opening? I need something inexpensive, which can be taken down easily. I have poles that I use for DXpeditions, and I suppose that these will do, to support the antenna.

                  The built-in whip just doesn't seem to cut it for me. True, I did not try it vs. the CM yesterday, but that GA Tropo opening 2 weeks ago was decent w/ the CM.

                  I might have to get one used.

                  cd

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                  • #10
                    After telling myself that I would not try building another antenna for 48mhz, I started the project this afternoon after making plans for a 3 element beam from http://www.k7mem.150m.com/Electronic.../yagi_vhf.html.

                    I had an old beat up rusty CM stereo probe 9 laying in the backyard so I took it apart and cut the aluminum up with some cheap copper pipe cutters. I have enough boom and aluminum for just 3 elements. It may take a couple more days until I have it finished but something like this would definitely work on 47.9. According to k7mem I should have around 5db or so. So if you can find some junker antennas around (not easy, I know), you could build a dipole or better if you have the time.

                    So it's supposed to rain most of this week so finishing this may take longer than I thought.
                    Mike B.
                    Enfield, CT
                    -72° 30' W/41° 59' N
                    FN31RX

                    Online since 1999 and still going at
                    mikesdx.com

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                    • #11
                      Originally posted by cd637299 View Post
                      So then, what make/model can be recommended for 30-54 MHz, and would it be worth it to get it now, or wait until a bigger opening? I need something inexpensive, which can be taken down easily. I have poles that I use for DXpeditions, and I suppose that these will do, to support the antenna.

                      cd
                      A very simple dipole could be made from 2 bits of wire or thin tube....Overall length can be caluculated from here http://www.csgnetwork.com/antennaedcalc.html

                      At the halfway point in the overall length The "inner" of the coax goes to one side and the "outer" to the other.The more vertical you get it the more omnidirectional the coverage would be.Response would be fairly broad so a 48 MHz one would give you coverage a few MHz down and up.

                      Hugh

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                      • #12
                        Other signals to look for are the Brazilian taxi despatchers over 38-40 MHz,two good frequencies here are 38.96 and 39.08 MHz

                        Okie Sam in Texas has a recording on 39.22 MHz https://sites.google.com/site/okiesa...-band-1/39-220 if you hear anything like this it's Brazil.

                        Hugh
                        Last edited by mrhoover; 05-04-2011, 02:27 PM.

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                        • #13
                          "Whenever I'm in Santiago, I listen to the new sound of fun loving XQB-10"
                          We thought the Spanish language stations we heard 29.7-30.0 MHZ (Azden ten meter FM rig) back twenty years ago were STL's.
                          With no announcements of any kind and on a band not normally used for direct broadcasting, these must be subscription based, as the old Muzak stations on SCA's, but in today's web media world? The audio quality far surpasses any SCA, though!
                          Last edited by ai4i; 05-04-2011, 03:46 PM.

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                          • #14
                            Why they use 40 MHz band instead of normal 88-108?

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                            • #15
                              They do, Bosko....this is not a "radio station" as such, but rather a music service, maybe for store background music and such. This *may be* the website of the service---I am still trying to sort this out....

                              www.scamusica.cl

                              cd

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