|
From: | Bijendra Singh |
Subject: | Re: [Discuss-gnuradio] Radio interoperability |
Date: | Thu, 10 Oct 2013 14:09:30 +0530 |
Hi Bijendra,
it's not quite clear what your question is.
A couple of things you might want to consider:
- AM is per se noisy. A commercial HF receiver would also have much
better filters than you can achieve with an LFRX-only setup, so expect
much noise here
- FM is much better with noise.
- You're not supposed to rx AM signals with an FM receiver.
- VHF and HF usually designate (separate) frequency ranges. So when
talking about 'interoperability' between those, most people will be
confused. Well, I am.
MB
> _______________________________________________
On Thu, Oct 10, 2013 at 12:58:06PM +0530, Bijendra Singh wrote:
> Hello every one,
>
> I'm working on a college level project to show interoperability between HF and
> VHF radio using GNU radio.
>
> My aims are listed below:
>
> 1) To obtain FM transmitter and receiver waveform in GNU radio as flowgraph,
> so that i can communicate between laptop and VHF radio (In my case I'm using
> radio of the range 30-89.899 MHz) :- This I have already achieved
>
>
> 2) To obtain AM transmitter and receiver waveform in GNu radio as flowgraph,
> so that I can communicate between laptop and HF radio (In my case I'm using a
> HF radio of the range 3-30 MHz) :- I was able to download a SSB receiver and
> it is functional but the noise level is high.
>
>
> 3) To integrate Fm transmitter with AM receiver, so that one way communicaton
> is possible from HF radio to VHF radio. :- This I have already achieved, but
> with too much of noise and low pitch voice.
>
>
> 4) To integrate AM transmitter with FM receiver so that one way communication
> is possible from VHF radio to HF radio. I'm still lackung behind in this.
>
>
> 5) To integrate both the 3rd and 4rth flowgraphs in a single flowgraph to make
> Hf and VHF radio interoperable from both sides.
>
>
> 6) My GNU version is 3.6.4.1, I'm using two usrp's 1 for the HF with lftx and
> lfrx daughter boards and the other for VHF with basic trans and basic receive
> daughter cards.Also I'm using dipole antenna.
>
>
> &0 Please guide me. I'm here attaching some .grc file I have downloaded, and
> which are working in my GNU, but noisy( only ssb_rx is noisy and sstx1 is not
> working)
>
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
--
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Dipl.-Ing. Martin Braun
Research Associate
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