Re: [Discuss-gnuradio] does USRP need some warm up before it gets into its normal state?

[George Nychis]

Bill Stevenson wrote:
> Hello, all!
>
> I am using demo file benchmark_tx.py and benchmark_rx.py to test the 
> average PER at a certain distance. Whenever I initiated a test, the 
> first two or three PER varied violently. For example, the expected PER 
> is around 4%, in the first three tests, PER might be 30% and after the 
> first three tests, each PER in each test would change within a constant 
> range, say 4%. Does USRP need some warm up before it goes to its stable 
> state?

It's a known issue with the USRP that there is a power spike when 
initializing.  I forget the exact cause of this, Matt would probably 
know.  I would throw away the first set of samples.

- George