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Re: [Discuss-gnuradio] Fhss

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] Fhss
Date: Tue, 26 May 2015 09:43:07 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0

Dear Anil,

the thing I've replied on usrp-users still applies here; I'll include the original text, so that others don't take the time to write the same:
Hi Anil,

You'll have to ask yourself: How does the time in your for loop correspond to samples?
In a simulation (ie. signal source/sink, no hardware blocks), the "wall clock time" has absolutely nothing to do with how fast samples pass through your flow graph. In a flow graph with hardware sinks, the wall clock time of your PC will very loosely correspond to some sample time.
I've already hinted at the GNU Radio guided tutorials and the GR mailing list. Right now, I'm explaining basic concepts together with the quite advanced stuff you want to do; this won't work very well for neither of us, so I'd ask you to really work through tutorials 1-6, and things will be much clearer, making you able to work much faster!

Best regards,


Best regards,


On 05/26/2015 09:38 AM, Anil Gaddam wrote:

Hello everyone,

I have got a serious problem while implementing frequency hopping spread spectrum using USRP B210.I tried to generate a python file using a GRC file containing a signal source followed by a sink.Then I applied the logic for hopping using a for loop.But there's no output visible on the gui. The terminal shows the hops in frequency but the GUI doesn't and it stops abruptly. So what should I do in order to solve the problem. I need to show somehow the hops on the GUI in real time .


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