Well it is a project I'm working on. I am trying to receive an AM signal from HF radio which will be provided in the usrp source in my gnu and will transmit a FM signal as output in the usrp sink which I'm trying to send it to the VHF radio. And vice versa. I'm using CNR-900 VHF radio which freq range is 30 to 89.899 MHz and RS-HX radio which freq range is 3 to 30 MHz. When I tried the hf2vhf.grc file, it is working, but with noise. Same thing will be possible for VHF to Hf, I guess. And I'm stuck in this. Any possible remedies??
On Thu, Oct 10, 2013 at 1:48 PM, Martin Braun (CEL) <martin.br...@kit.edu>wrote: > 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 > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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