Hi Luis,

Thank you for the reply. 
I have a GPSDO to use as clock in. 
However I see the WX scopes and analysis toolsin Gnuradio can only measure is Micro-seconds. That is my concern. The time scales I see are in milliseconds and microseconds in function. 

So, with what I want to do ( CW burst time of arrival) in Gnuradio. Which method do you advice I use to achieve this. Which blocks arrangement?‎ 
And which  measuring blocks will give Nanoseconds reading? 

Also I observe my CPU drags at high sampling rate though sometimes Ok at 10MHZ. Does it count in my Nanoseconds reading?

Thank You
Ernest.

Sent from my BlackBerry 10 smartphone.
From: n0p [Luis Bernal]
Sent: Monday, March 14, 2016 12:57 PM
To: ERNEST MATEY
Cc: [email protected] >> hackrf-dev
Subject: Re: [Hackrf-dev] TIME OF ARRIVAL OF CW SINGAL in Nanoseconds with HackRf

To achieve this you will need to use a high precision 10Mhz clock and timestamp the signal in the CPLD of the hackrf because the USB bus will add a somewhat random delay to your signal

2016-03-13 7:59 GMT+01:00 ERNEST MATEY <[email protected]>:
Hi all,

I am working on a Project to determine the Time of arrival of CW signal. 

I am using HACKRF on gnuradio. 

How best can I do this. I have my HackRf radio, gps-clock for external reference and a fast-autocorrelation block on Gnuradio.  

How can I achieve this? I want to work in Nanoseconds. How do I realize this in Gnuradio.

Ernest

Sent from my BlackBerry 10 smartphone.


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