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Re: [Discuss-gnuradio] Synchronize USRP using 5Hz pps
From: |
Josh Blum |
Subject: |
Re: [Discuss-gnuradio] Synchronize USRP using 5Hz pps |
Date: |
Tue, 18 Jan 2011 17:45:16 -0800 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.13) Gecko/20101208 Lightning/1.0b2 Thunderbird/3.1.7 |
Using a 5Hz PPS is not fundamentally different than 1Hz. That should not
be a problem.
Make sure your pulse has the correct levels:
http://www.ettus.com/uhd_docs/manual/html/usrp2.html#pps-pulse-per-second
-Josh
On 01/18/2011 05:36 PM, Sangho Oh wrote:
> Hello,
>
> I am using Garmin 18 5Hz PPS clock for USRP synchronization.
>
> This is the GPS: https://buy.garmin.com/shop/shop.do?pID=8631
>
> However, because it is 5Hz PPS not 1Hz, the synchronization looks not
> working properly.
>
> I got following message on the time stamp reading after 1 sec.
>
> "Creating the usrp device with: ...
> Current recv sock buff size: 50000000 bytes
> Synched to PPS: Reading time 1s later: 0.829645"
>
> As you see, the time reading after 1 sec is smaller than 1 sec.
>
> I am wondering if I have to buy another GPS for 1 Hz PPS.
>
> Thanks.
>
> - Sangho
>
>
>
>
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