[Discuss-gnuradio] Change frequency in USRP source automatically

[Yan Huang]

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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