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 > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- Karlsruhe Institute of Technology (KIT) Communications Engineering Lab (CEL) Dipl.-Ing. Martin Braun Research Associate Kaiserstraße 12 Building 05.01 76131 Karlsruhe Phone: +49 721 608-43790 Fax: +49 721 608-46071 www.cel.kit.edu KIT -- University of the State of Baden-Württemberg and National Laboratory of the Helmholtz Association
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