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Re: [Discuss-gnuradio] UHD disable receive

From: Josh Blum
Subject: Re: [Discuss-gnuradio] UHD disable receive
Date: Wed, 20 Apr 2011 15:15:47 -0700
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110223 Lightning/1.0b2 Thunderbird/3.1.8

On 04/20/2011 03:03 PM, Feng Andrew Ge wrote:
> Josh,
> When you say " In any case, you can shutoff the rx mixer in full duplex
> mode with this little change:", is it true that this radio, once started
> with the changed code, cannot receive anymore at it runtime?

No: When, and only when, the device is simultaneously transmitting _and_
receiving (full duplex mode); the change will cause the rx mixer to be
turned off. This effectively feeds noise into the ADC.

So if you are always receiving, the mixer will only turn off when you
pass samples into the usrp sink block (which causes a transmission to
occur). Once all samples have been transmitted, the mixer will come back on.

The change is a "quick hack" and is not the recommended way to do things.


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