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Re: [Discuss-gnuradio] What does the USRP transmit after I've done tx->s

From: Dan Halperin
Subject: Re: [Discuss-gnuradio] What does the USRP transmit after I've done tx->stop.
Date: Fri, 25 Apr 2008 09:21:18 -0700

Hash: SHA1

I don't know how relevant this is, but I have fixed similar problems in the past by making sure that the host app sends data that's an even multiple of 512 bytes. (This is harder than you think :))

I found that if you send a number of sample bytes equivalent to 1 same mod 512 bytes, for instance, the last sample is repeated for some time and can be observed as a short pilot tone. I never did too much digging into this, however -- I just modified the transmitting app to pad.

- -Dan

On Apr 25, 2008, at 7:31 AM, George Nychis wrote:

Per Zetterberg wrote:
Hi All,
I am transmitting a stream of buffers from the USRP (based on libusrp with standard .rbf file). After I've done tx->stop (where tx is a pointer to usrp_standard_tx) it seems that the USRP is repeating the last transmitted
buffer (or couple of buffers ?). Is this correct ?

Continually, until you unplug the board? If so, I've noticed this behavior too as of recent... I used to be able to replicate it 100% of the time, but haven't tried for a couple weeks.

Are you using the current GNU Radio trunk?

- George

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