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Re: [Discuss-gnuradio] B200 clock calibration
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From: |
Marcus Leech |
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Subject: |
Re: [Discuss-gnuradio] B200 clock calibration |
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Date: |
Thu, 15 May 2014 15:23:00 +0000 (UTC) |
The only way to really make this work "properly" is to go closed-loop. At that point, you might as well use an external reference. I've pointed out before
that 10MHz OCXOs are available cheaply, and generally achieve 100PPB *at worst*, even the "scrap pulls" that are cheaply available on eBay usually
acheive better than 50PPB. $20.00 and a bit of soldering, and you have a pretty-darned good reference that you can even share among multiple units,
with a bit of skill.
This is perhaps better than voiding warantees on expensive hardware....
on May 15, 2014,
Nick Foster <address@hidden> wrote:
The ADF4001's output charge pump is tristated when not locking to an external reference, and a resistor divider holds the VCTCXO's tuning input at 1/2 Vcc. The B200 hardware can use the AD9361's low-speed DAC to drive the VCTCXO's tuning input via AUXDAC1 if R118 is populated; however, this functionality is not supported by the B200 UHD driver.
--n
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