|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|
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.
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