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Re: USRP N210 Synchronization
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From: |
Marcus D. Leech |
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Subject: |
Re: USRP N210 Synchronization |
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Date: |
Wed, 10 Mar 2021 11:02:55 -0500 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 |
On 03/10/2021 07:26 AM, Martin Braun wrote:
USRPs typically operate with a 25% duty cycle PPS (i.e., 250 ms on,
750 ms off). But they will work with pretty much any duty cycle.
Check the levels are within limits (I don't have them off the top of
my head). I would suggest you connect your PPS/10 MHz generator
directly to the USRP, and see if that works. Then, the splitter to see
if that's ruining your levels.
Note that we sell such a splitter:
https://www.ettus.com/all-products/octoclock/
I might be more than your budget, which I understand, but it's what we
usually use for these types of applications.
--M
The input voltage for 1PPS on N2xx is between 3.3V and 5V -- so
basically LVTTL input levels. My recollection is that going below 3.3V
leads to unreliable 1PPS, from threads on this topic back in 2018.
Cheers
Marcus