[Discuss-gnuradio] Re: Dynamically changing parameters of a block

[William Sherman]

I also have been having trouble trying to dynamically change the 
parameter of a block.

In this case the amplitude of the sine wave in usrp_siggen.py 
(gr.sig_source_f).

I use the set amplitude function of the top_block to change the 
amplitude in my main loop. However, observing the spectrum using FFT 
when I change the amplitude the signal seems to stop working (big FFT 
spike disappears).

Can I not use the set amplitude function in usrp_siggen.py to 
dynamically change the signal amplitude in a main loop?

I will try using gr.multiply_const_cc as recommended by Richard Jaeger.
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