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Re: [Discuss-gnuradio] USRP heating up !

From: Javs
Subject: Re: [Discuss-gnuradio] USRP heating up !
Date: Thu, 21 Apr 2005 09:32:45 -0700 (PDT)

Hi all,

I tried the experiment again today and I think I
answered my question. I first ran the am_rcv.py
example which pops a GUI, a very tiny one since the
pre_demod, post_demod and post_filt blocks were
commented. And this was hiding on the top left corner
of my screen (I missed it). Assuming, there was no GUI
for this code, I used Cntrl C to kill it. Although I
wrongly assumed it was ended it actually was not
destroyed and was running its internal processes,
thereby heating the codecs.

I think the way the 'Destroy' destructor for the GUI's
is written is applicable only if we gracefully exit
the GUI (i.e. through File->exit  on the GUI). It
seems to me that Cntrl C does not totally kill the
internal processes in the codecs and they continuosly
receive the power. 

Lesson learnt : Avoid using Cntrl C to close your
I still am not sure of one thing though. When I run
the example 'wfm_rcv_gui.py' with my basic d'board on
the A side, the codec on the B side heats up. It seems
like when I receive on A side the Codec on the other
side has no job . If this is true, I think a better
way to cut power to the unused codec would be to use
the 'which_side' logic. Or this is probably what Eric
was inkling at when he mentioned about ways to
ameliorate the problem.

Thanks for all your help.



--- Eric Blossom <address@hidden> wrote:
> On Mon, Apr 11, 2005 at 10:38:39PM -0700, Eric
> Blossom wrote:
> >
> > I've made a bunch of power measurements and Matt
> and I have been
> > discussing some ways to ameliorate the problem.  I
> expect to have a
> > few of them coded up over the next couple of days.
> Following up on my own post, I wanted to make clear
> that the power
> measurements I made indicate that the power
> consumption is within
> spec.  We've been talking about ways to lower the
> power consumption by
> turning off parts of the AD9862 when they are not
> required.
> Eric
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden

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