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Re: [Discuss-gnuradio] external clock

From: Marcus Leech
Subject: Re: [Discuss-gnuradio] external clock
Date: Fri, 19 Aug 2005 13:32:36 -0400
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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 to
tame, 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...

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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