Re: [Discuss-gnuradio] CW between bursts

[Josh Blum]

On 12/11/2011 08:26 PM, Nowlan, Sean wrote:
> I'm not sure whether this is a GNU radio or USRP issue, so I'm
> posting to both lists. I played around with GNU radio's stream
> tagging feature and managed to implement something that does timed
> bursts (partially by taking a lead from tag_source_demo.h, etc. in
> gr-uhd/examples).
> 

Cool!

> I'm observing a continuous wave at the carrier frequency in between
> bursts, and also during start-up when the gr_uhd_usrp_sink object is
> instantiated before any samples get transmitted. The CW is about 30
> to 40 dB down from my signal, but I'd like the radio to be silent in
> between bursts.

I suppose you are seeing the LO of the transmitter. What daughterboard
is this? I recently pushed a change because SBX was not properly
disabled between TX bursts.

-Josh