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Re: [Discuss-gnuradio] USRP heating up !

From: Javs
Subject: Re: [Discuss-gnuradio] USRP heating up !
Date: Thu, 7 Apr 2005 14:24:57 -0700 (PDT)




I tried the following and observed this:


>During normal operation, the AD chips can get pretty warm.  Try >this:


>1 - Take off all daughterboards.


>2 - Plug in the the USRP.  Do not run any software.  Leave it for a >few minutes.

Every chip other than the power supply on there should be at room temp.  The LED should be flashing about 2-3 times per second.


Power supply and the Cypress chip(?) are a little higher than room temperature. LED at 3Hz.


>3 - Run some of the examples, and quit them normally (no ctrl-C).  >A few minutes later the FPGA and AD chips should be back to room >temp.  The LED should be flashing slower.


FPGA is warm. AD chips get warmer and so does the cypress chip. LED at 1hz. And they do NOT get back to normal temp.


>4 - Run a receive program (like usrp_fft).  After a few minutes, >the AD chip should be just slightly warm.


Yes it is !


>5 - Leave the receive program running.  In another window start up >a transmit program (like usrp_siggen).  The codec chips should get >pretty hot, but not painfully hot.  The FPGA should only show the >slightest hint of warmness.


At this stage when I run simultaneous Tx (siggen) and Rx (usrp_fft) programs, the Codecs get pretty hot. To the extent that I cannot lay my fingure and rest it for about 3-5 secs (burning sensation). The FPGA is slightly warm and the FX2 stays somewhere between the codecs and FPGA.


>6 - Quit the receive program.  The chips shoul get much cooler now.

>7 - quit the transmit program.  Everything should return to room >temp.


The temperature drops down a bit, but still hot(definitely NOT at room temperature). I am concerned if there are any hidden processes going on in the codecs even after I close the programs which are causing this heat?


I understand that I am not using specific numbers to pinpoint the degree of heat, but I hope I gave the picture.


Thanks in advance.




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