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From: | Marcus Leech |
Subject: | Re: [Discuss-gnuradio] external clock |
Date: | Fri, 19 Aug 2005 13:32:36 -0400 |
User-agent: | Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 |
Bdale Garbee wrote:
Meanwhile, I poked Matt for an updated delivery estimate on the USRP L and S band daughter cards the other day but haven't heard back from him yet. Does anyone else (Eric?) know enough about the design of those to share the up/down conversion approach? Is there another oscillator totame, a PLL driven by a USRP reference clock, or what?There's only two months until the first half of the ARRL EME contest, which I'd love to be on the air for on 1296... Bdale
Are you talking about the DBS_RX, or something else? The DBS_RX uses the USRP refclk, divided down to 4Mhz or so, which feeds a PLL-based quadrature direct-conversion receiver, covering 800Mhz or so to about 2Ghz or so. The phase noise on the DBS_RX isn't spectacular, because the chip (MAX2118) is designed for wideband DBS satellite TV reception. -- Marcus Leech Mail: Dept 1A12, M/S: 04352P16 Security Standards Advisor Phone: (ESN) 393-9145 +1 613 763 9145 Advanced Technology Research Nortel Networks address@hidden
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