[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Discuss-gnuradio] grGPS Preliminary Schematic

From: Marcus Leech
Subject: Re: [Discuss-gnuradio] grGPS Preliminary Schematic
Date: Thu, 06 Apr 2006 01:41:06 -0400
User-agent: Thunderbird 1.5 (X11/20051201)

Farnell sell 32.768 MHz crystals (They're not what you'd call cheap though - AU$17). Hmm they have 16.384 MHz ones for $12.81. Still not cheap..

Also, I think getting 32.768 MHz from 4Mhz with a PLL would be pretty difficult (if not impossible)

Given that you haven't looked into the PLLs on the FPGA, it's rather too early
 to conclude that you couldn't synthesize 32.768Mhz from the 4Mhz reference
 clock that's already on the USRP.

Given reasonable dividers for both reference and VFO, I can't see why synthesizing 32.768Mhz would be all that difficult. I can understand why you might want to use a dedicated oscillator--you don't have to muck with the FPGA. But asserting that it's "difficult (if not impossible)" is hard to support if you haven't looked into it.

reply via email to

[Prev in Thread] Current Thread [Next in Thread]