|
From: | 闷 郁 |
Subject: | Re: [Discuss-gnuradio] delay of Synchronization by using PPS |
Date: | Fri, 18 Jul 2014 01:44:46 +0800 |
sry, i think a screenshot sould be much better.
if attachments doesnt work,here is the link from google drive : https://drive.google.com/file/d/0B_ix7k8ahVJ3MDItTlNTNHJRNWM/edit?usp=sharing when i executed my flow graph i got left timing diagram,then i killed it and executed again,i got right timing diagram. it looks like one signal "moved" to right side a bit.thats the delay i was talking about. even the left one looks odd,what i expect sould be a 1000Hz Square,well at least sould look like a Square. Yao Date: Thu, 17 Jul 2014 19:22:58 +0200 From: address@hidden To: address@hidden Subject: Re: [Discuss-gnuradio] delay of Synchronization by using PPS Hi 闷 郁, I don't really understand your timing diagram (~-_- style), could you explain them in more detail? Greetings, Marcus On 17.07.2014 18:32, 闷 郁 wrote:
hi guys, Im using a USRP-N and a USRP2 to send a Square Signal to another USRP2 for proving Synchronization by using PPS. after execute a get following message: linux; GNU C++ version 4.6.3; Boost_104800; UHD_003.007.000-1-stable Using Volk machine: sse4_1_32 -- Opening a USRP2/N-Series device... -- Current recv frame size: 1472 bytes -- Current send frame size: 1472 bytes -- 1) catch time transition at pps edge -- 2) set times next pps (synchronously) -- Opening a USRP2/N-Series device... -- Current recv frame size: 1472 bytes -- Current send frame size: 1472 bytes -- 1) catch time transition at pps edge -- 2) set times next pps (synchronously) -- Opening a USRP2/N-Series device... -- Current recv frame size: 1472 bytes -- Current send frame size: 1472 bytes -- 1) catch time transition at pps edge -- 2) set times next pps (synchronously) It seems to work well,but when i look into the scope sink i found a pretty randomed delay between 2 Transmitters. it looks like this: --˜˜˜--___--˜˜˜--___--˜˜˜--___--˜˜˜--___ after restart it would look like this:-˜˜˜˜-____-˜˜˜˜-____-˜˜˜˜-____-˜˜˜˜-____ I tried set a delay-block to compensate,but i realize coz of random i cant find a constant delay. did I do something wrong or there is a certain way to "tell" the 2 Transmitters send Signal in the same time? Yao _______________________________________________ Discuss-gnuradio mailing list address@hidden https://lists.gnu.org/mailman/listinfo/discuss-gnuradio |
Screenshot from 2014-07-17 193343.png
Description: PNG image
[Prev in Thread] | Current Thread | [Next in Thread] |