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Receiving weather pictures from NOAA APT satellites with POWER SDR

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  • jorschei
    Hi All; To day it is possible to receive FM on the 145 MHz with the Softrock SDR kits and an VHF convertor. It is also possible to receive Satellite APT
    Message 1 of 4 , Nov 12, 2008
      Hi All;
      To day it is possible to receive FM on the 145 MHz with the Softrock
      SDR kits and an VHF convertor.
      It is also possible to receive Satellite APT transmissions in the
      137-138 MHz band. For receiving APT a 35 KHz wide channel fit in the
      48 KHz I & Q IF.

      POWER SDR has the capability receiving FM bud is limited in
      bandwith and has no doppler PLL tracking FM demodulator to recover
      the 2400 picture audio.

      Stored APT audio can be processed with WXtiomg software til weather
      pictures.

      Is some one thinking of, or already building an APT demodulator to
      extend POWER SDR ?
      With a NOAA APT demodulator in POWER SDR, SDR can be a great
      satellite weather receiver!!

      73" Joris PE1KTH
    • Christos Nikolaou
      Hi Joris, The FM modulation in PowerSDR-IQ can have up to 20KHz bandwidth when you slide the bottom filter width slider but yet again that is not enough as you
      Message 2 of 4 , Nov 12, 2008
        Hi Joris,

        The FM modulation in PowerSDR-IQ can have up to 20KHz bandwidth when
        you slide the bottom filter width slider but yet again that is not
        enough as you said.
        There is although a mode named 'SPEC' the special mode whereas the
        whole band (192KHz) is passed to other applications via the VAC.
        Of course you need also either a vitrual audio application or physical
        cables and a few more audio inputs.

        If you have such an application you could give it a try.

        73,
        Christos SV1EIA


        --- In powersdr-iq@yahoogroups.com, "jorschei" <kthkit@...> wrote:
        >
        > Hi All;
        > To day it is possible to receive FM on the 145 MHz with the Softrock
        > SDR kits and an VHF convertor.
        > It is also possible to receive Satellite APT transmissions in the
        > 137-138 MHz band. For receiving APT a 35 KHz wide channel fit in the
        > 48 KHz I & Q IF.
        >
        > POWER SDR has the capability receiving FM bud is limited in
        > bandwith and has no doppler PLL tracking FM demodulator to recover
        > the 2400 picture audio.
        >
        > Stored APT audio can be processed with WXtiomg software til weather
        > pictures.
        >
        > Is some one thinking of, or already building an APT demodulator to
        > extend POWER SDR ?
        > With a NOAA APT demodulator in POWER SDR, SDR can be a great
        > satellite weather receiver!!
        >
        > 73" Joris PE1KTH
        >
      • jorschei
        Hi Christos, Thanks for your replay, Yes it can be done to store de hole spectrum. Bud FM demodulation has to be done 35 KHz wide to get all the data. I try
        Message 3 of 4 , Nov 12, 2008
          Hi Christos,

          Thanks for your replay, Yes it can be done to store de hole
          spectrum. Bud FM demodulation has to be done 35 KHz wide to get all
          the data.
          I try Rocky, the 48 KHz band can be stored bud has no FM
          demodulator.
          To get the best signal to noise ratio for a clean picture the
          software filter must fit exact over the NOAA signal.
          There must be compensated for the + or - 3 KHz dopler shift to stay
          in the filter.

          Ik hope a software specialist ( I am not )in the community wil take
          the challance to built an demodulator.

          SDR is an great receiver for NOAA APT.

          '73 Joris PE1KTH

          --- In powersdr-iq@yahoogroups.com, "Christos Nikolaou" <sv1eia@...>
          wrote:
          >
          > Hi Joris,
          >
          > The FM modulation in PowerSDR-IQ can have up to 20KHz bandwidth
          when
          > you slide the bottom filter width slider but yet again that is not
          > enough as you said.
          > There is although a mode named 'SPEC' the special mode whereas the
          > whole band (192KHz) is passed to other applications via the VAC.
          > Of course you need also either a vitrual audio application or
          physical
          > cables and a few more audio inputs.
          >
          > If you have such an application you could give it a try.
          >
          > 73,
          > Christos SV1EIA
          >
          >
          > --- In powersdr-iq@yahoogroups.com, "jorschei" <kthkit@> wrote:
          > >
          > > Hi All;
          > > To day it is possible to receive FM on the 145 MHz with the
          Softrock
          > > SDR kits and an VHF convertor.
          > > It is also possible to receive Satellite APT transmissions in
          the
          > > 137-138 MHz band. For receiving APT a 35 KHz wide channel fit in
          the
          > > 48 KHz I & Q IF.
          > >
          > > POWER SDR has the capability receiving FM bud is limited in
          > > bandwith and has no doppler PLL tracking FM demodulator to
          recover
          > > the 2400 picture audio.
          > >
          > > Stored APT audio can be processed with WXtiomg software til
          weather
          > > pictures.
          > >
          > > Is some one thinking of, or already building an APT demodulator
          to
          > > extend POWER SDR ?
          > > With a NOAA APT demodulator in POWER SDR, SDR can be a great
          > > satellite weather receiver!!
          > >
          > > 73" Joris PE1KTH
          > >
          >
        • Christos Nikolaou
          Joris, So, you simply want a FM demodulator not just 20KHz but at least 35KHz. Ok, let me see what I can do about it, if DttSP supports it I ll place the
          Message 4 of 4 , Nov 12, 2008
            Joris,

            So, you simply want a FM demodulator not just 20KHz but at least 35KHz.

            Ok, let me see what I can do about it, if DttSP supports it I'll place
            the enable settings in the main radio console.

            73,
            Christos SV1EIA


            --- In powersdr-iq@yahoogroups.com, "jorschei" <kthkit@...> wrote:
            >
            > Hi Christos,
            >
            > Thanks for your replay, Yes it can be done to store de hole
            > spectrum. Bud FM demodulation has to be done 35 KHz wide to get all
            > the data.
            > I try Rocky, the 48 KHz band can be stored bud has no FM
            > demodulator.
            > To get the best signal to noise ratio for a clean picture the
            > software filter must fit exact over the NOAA signal.
            > There must be compensated for the + or - 3 KHz dopler shift to stay
            > in the filter.
            >
            > Ik hope a software specialist ( I am not )in the community wil take
            > the challance to built an demodulator.
            >
            > SDR is an great receiver for NOAA APT.
            >
            > '73 Joris PE1KTH
            >
            > --- In powersdr-iq@yahoogroups.com, "Christos Nikolaou" <sv1eia@>
            > wrote:
            > >
            > > Hi Joris,
            > >
            > > The FM modulation in PowerSDR-IQ can have up to 20KHz bandwidth
            > when
            > > you slide the bottom filter width slider but yet again that is not
            > > enough as you said.
            > > There is although a mode named 'SPEC' the special mode whereas the
            > > whole band (192KHz) is passed to other applications via the VAC.
            > > Of course you need also either a vitrual audio application or
            > physical
            > > cables and a few more audio inputs.
            > >
            > > If you have such an application you could give it a try.
            > >
            > > 73,
            > > Christos SV1EIA
            > >
            > >
            > > --- In powersdr-iq@yahoogroups.com, "jorschei" <kthkit@> wrote:
            > > >
            > > > Hi All;
            > > > To day it is possible to receive FM on the 145 MHz with the
            > Softrock
            > > > SDR kits and an VHF convertor.
            > > > It is also possible to receive Satellite APT transmissions in
            > the
            > > > 137-138 MHz band. For receiving APT a 35 KHz wide channel fit in
            > the
            > > > 48 KHz I & Q IF.
            > > >
            > > > POWER SDR has the capability receiving FM bud is limited in
            > > > bandwith and has no doppler PLL tracking FM demodulator to
            > recover
            > > > the 2400 picture audio.
            > > >
            > > > Stored APT audio can be processed with WXtiomg software til
            > weather
            > > > pictures.
            > > >
            > > > Is some one thinking of, or already building an APT demodulator
            > to
            > > > extend POWER SDR ?
            > > > With a NOAA APT demodulator in POWER SDR, SDR can be a great
            > > > satellite weather receiver!!
            > > >
            > > > 73" Joris PE1KTH
            > > >
            > >
            >
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