________________________________
From: George Nychis <[EMAIL PROTECTED]>
To: Bill Stevenson <[EMAIL PROTECTED]>
Cc: discuss-gnuradio@gnu.org
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
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
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