Re: GNURadio N210 UHD Sink input as a number.

[Marcus D. Leech]

On 04/10/2020 11:22 AM, Phan Anh wrote:
> Hi Marcus,
> Thanks so much for your quick response. Actually, I got the strongest 
> frequency already and it is now at the output of an "Add Const" block 
> in GNURadio.
> I wonder how can I use such number (frequency number e.g. 151 MHz) as 
> the center frequency for a "UHD Sink" or "Osmocom Sink" block? (on the 
> same flowgraph in GNURadio Companion). The procedure should be:
> Step 1: FFT + Arithmetic --> Obtain the strongest frequency Fs [I did 
> it already]
> Step 2: Transmit a cosine signal (via UHD or Osmocom) using the 
> strongest frequency obtained in step 1 [I am asking about this]
> Again, I really appreciate your help.
> Best,
> Anh
The UHD sink has a message port, which would allow you to send a message 
to change the frequency.

https://www.gnuradio.org/doc/doxygen/page_uhd.html

I'd have the block that determines the appropriate frequency send a 
message to the UHD sink block to change the frequency.