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Subject: |
Re: HPRT receiving station |
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Date: |
Tue, 11 Mar 2014 20:27:05 +0200 |
Hi Pablo,
NOAA HRPT is Manchester BPSK. I used Johnathan's noaa_hrpt_decoder.cc/h
and enhanced the deframer.
Perhaps Johnathan can help you more?
http://gnuradio.org/redmine/projects/gnuradio/repository/revisions/350726ae56d46d2c7c1adf71b7049369a428d455/show/gr-noaa/lib
Patrik
On Tue, 2014-03-11 at 17:48 +0100, Pablo Fernández Alonso wrote:
> Hello Patrik,
>
> Where can I find a detailed explanation for the structure of the HRPT
> receiver in GNU radio? I saw several examples, but I don't understand how the
> signa lis demodulated.
>
> Regards,
>
> Pablo.
>
> -----Mensaje original-----
> De: Patrik Tast [mailto:address@hidden
> Enviado el: miércoles, 5 de marzo de 2014 13:47
> Para: Pablo Fernández Alonso
> Asunto: Re: HPRT receiving station
>
> Hi Pablo,
>
> Before you order I suspect you could use an offset dish (70 x 50cm) I guess
> you can buy on for €1, as a start?
> Patrik
>
>
> On Wed, 2014-03-05 at 12:11 +0100, Pablo Fernández Alonso wrote:
> > Hi Patrik,
> >
> >
> > I am going to order a 1.5 m parabolic dish and the distance between
> > the dish and the PC is around 40 meters. I designed helix feed with 9
> > dB of gain for F/D = 0.5. I need a (cheap) lnb downconverter to vhf in
> > order to reduce the cable attenuation.
> >
> >
> > Regards,
> >
> >
> > Pablo.
> >
> >
> > 2014-03-05 10:52 GMT+01:00 Patrik Tast <address@hidden>:
> > Hi Pablo,
> >
> > 8.5dB (at the receiver) and a LHCP helix feed designed for
> > "that" dish
> > will work.
> > We must know your COAX cable type and length so we can
> > calculate your
> > loss.
> > When designing the helix feed, use dish 10 dB taper, usually 3
> > turns for
> > a parabolic dish but if an offset dish is used use +6 turns.
> >
> > If you provide me data of your dish size (parabolic or
> > offset), f/D and
> > COAX type and length I can quickly help you with an option.
> >
> > A good enough LNA can be found here
> > http://lna4all.blogspot.fi/
> >
> > Regards,
> > Patrik
> >
> > On Wed, 2014-03-05 at 10:35 +0100, Pablo Fernández Alonso
> > wrote:
> > > Hi Patrik,
> > >
> > >
> > > Do you think it is possible to receive HRPT using the dish
> > but without
> > > a LNA? I saw an article where the author receives with an
> > helical
> > > antenna with 8.5 dB of gain and a 20 dB LNA. I tried to
> > contact with
> > > them, but I received no answer.
> > >
> > >
> > >
> >
> > http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1488531&tag=1
> > >
> > >
> > >
> > > Regards,
> > >
> > >
> > > Pablo.
> > >
> > >
> > > 2014-02-26 21:04 GMT+01:00 Patrik Tast
> > <address@hidden>:
> > > Hi Pablo,
> > >
> > > No, you will run into problems, as you can see I'm
> > using a
> > > 1.5m dish and
> > > you need to track the satellite
> > >
> > > Patrik
> > >
> > > On Wed, 2014-02-26 at 13:02 +0100, Pablo Fernández
> > Alonso
> > > wrote:
> > > > Hello Patrik,
> > > >
> > > >
> > > > You replied my question about an HRPT receiver
> > using GNU
> > > radio. I am
> > > > designing the station, and I don't know the gain
> > needed to
> > > receive
> > > > this sort of images correctly, so if you could
> > help me I
> > > would be
> > > > really helpful. I am designing a microstrip array
> > to do it
> > > but I don't
> > > > know if the gain would be enough.
> > > >
> > > >
> > > > Regards,
> > > >
> > > >
> > > > Pablo Fernandez
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
> >
> >
>
>
>
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