Re: [Discuss-gnuradio] Change frequency in USRP source automatically

[Martin Braun]

Yan,

check the PMT manuals. cons() takes 2 PMTs as input.


Cheers,
Martin

On 03/14/2016 09:09 AM, Yan Huang wrote:
> Hi all,
> 
>  
> 
> I want to change the frequency in “USRP source” automatically, for
> example 2.37GHz-2.43GHz with each time stepping 2MHz.
> 
>  
> 
> 1. As you know, the USRP source has an input message port, so I want to
> connect it to a “Message strobe” to control the frequency change. But
>  after I see [1][2], I write PMT type commands  in “Message PMT” in
> “Message Strobe” as:
> 
> pmt::cons(“freq”,2.4e9)
> 
> it comes up error “invalid syntax(<string>,line 1)”, so I don’t know how
> to further stepping the frequency.
> 
> 2. If I use the “Message Strobe” to define frequency, what can I put in
> the “frequency” in “USRP source” block? Put it as 0?
> 
>  
> 
> [1] https://gnuradio.org/doc/doxygen/page_uhd.html#uhd_command_syntax
> 
> [2]
> https://gnuradio.org/doc/doxygen/page_msg_passing.html#msg_passing_commands
> 
>  
> 
> Many thanks ,
> 
>  
> 
> Yan
> 
>  
> 
> 
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