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Re: [Discuss-gnuradio] GRC pure FSK with USRP1 board sampling troubles
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From: |
Marcus D. Leech |
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Subject: |
Re: [Discuss-gnuradio] GRC pure FSK with USRP1 board sampling troubles |
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Date: |
Fri, 20 May 2011 00:06:26 -0400 |
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User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.15) Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10 |
On 05/19/2011 11:51 PM, ikjtel wrote:
> Yep - it just so happens that these are "digital" (P25) channels,
> not analog ones, but robust detection/correction protocols at the
> higher levels are there to cope with the occasional glitches...
>
If they fly through the aether, they're analog. Once a signal leaves
the warm cozy domain of the digital world, it's analog. It becomes
analog as soon as it leaves the DAC on the USRP. It's then at the
mercy of the not-so-tender ministrations of the actively-trying-gut-you
analog world. You may well have deluded the signal into thinking it's
digital, but it's a thin, thin delusion once it hits the antenna.... :-)
--
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org