At 06:09 AM 10/1/2005, Ahti Aintila wrote:
I can confirm Eric's statement. One of our three SDR-1000 systems had this problem. Cooling down the AD9854 helped temporarily. Then I installed a bigger heatsink that worked a couple of weeks until the synthesizer got damaged so badly that it did not work any more with any version of the PowerSDR software. Amazingly though, with one of our own small test program it still worked. However, for fully functional tasks of the PowerSDR the chip had to be replaced.
Thermal damage that results in a partial failure? This brings up an interesting question. Is there some sort of simple diagnostic program or process that could be used to determine if this has occurred?
Did you do any sort of failure analysis on the part that was removed?
73, Ahti OH2RZ
James Lux, P.E. Spacecraft Radio Frequency Subsystems Group Flight Communications Systems Section Jet Propulsion Laboratory, Mail Stop 161-213 4800 Oak Grove Drive Pasadena CA 91109 tel: (818)354-2075 fax: (818)393-6875
