# Fhss

**URL:** <https://www.ruby-forum.com/t/fhss/242087>\
**Category:** GNU Radio\
**Created:** [May 26, 2015, 9:39am UTC](https://www.ruby-forum.com/t/fhss/242087 "2015-05-26T09:39:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [May 26, 2015, 9:39am UTC](https://www.ruby-forum.com/t/fhss/242087/1 "2015-05-26T09:39:58Z")

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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 .

Regards,  
Anil

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**Author:** ![anilg](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/73ab20/32.png) [@anilg](https://www.ruby-forum.com/u/anilg)\
**Post date:** [May 26, 2015, 9:44am UTC](https://www.ruby-forum.com/t/fhss/242087/2 "2015-05-26T09:44:04Z")

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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:

> 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,  
> Marcus
> 
> [https://gnuradio.org/redmine/projects/gnuradio/wiki/Guided\_Tutorials](https://gnuradio.org/redmine/projects/gnuradio/wiki/Guided_Tutorials)

Best regards,

Marcus