From: George N. [email protected]
To: Bill S. [email protected]
Cc: [email protected]
Sent: Thursday, November 20, 2008 8:17:17 PM
Subject: Re: [Discuss-gnuradio] does USRP need some warm up before it
gets into its normal state?
Thank you George! Do you know how many samples I should throw away
because sometimes it appeares to be 2 samples, while other times it
appears to be 10 samples? Could Matt tell me what the size of the first
set would be? Thank you!
Bill S. wrote:
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.Â I forget the exact cause of this, Matt would probably
know.Â I would throw away the first set of samples.