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From: | Marcus Müller |
Subject: | Re: [Discuss-gnuradio] Radio interoperability |
Date: | Thu, 10 Oct 2013 12:05:31 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.0 |
Hi Bijendra,
I, too, am confused. So let's try to understand what you are doing here! On 10/10/2013 10:39 AM, Bijendra Singh wrote:
Yes, so receiving amplitude modulated audio on a carrier somewhere between 3MHz and 30Mhz (==HF) You want to capture that using a USRP and GNU Radio, I presume. Aaaaha! Second chain of operation! You want to simultaneously generate an FM signal And you want to transmit that using a USRP (the same USRP?) to another Radio receiver, that listens on a VHF carrier (30MHz-300MHz) then. Huh? Your radio receivers usually can't transmit, so that's confusing OOooooh ok... this is military communications, and I was under the impression we're talking broadcast Radio stations. I must try to reunderstand now: You're trying to set up a relay station, for someone with some kind of HF AM tactical radio to communicate with someone with a VHF FM tactical radio, right? Anyway, Martin is right: Whatever you do, AM will always be noisy because it's AM, and unless you use laaarge antennas the HF signal on the USRP will most probably be strongly attenuated (1/2 wavelength of 30MHz is 5m...). So your SNR gets even worse. Greetings, Marcus
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