KX3 WSPR Thermo Stressing?
Posted by
GeorgeP1111 on
Sep 09, 2018; 4:11pm
URL: http://elecraft.85.s1.nabble.com/KX3-WSPR-Thermo-Stressing-tp7644935.html
I am using my KX3 as a WSPR beacon at 500mw with a Arduino based controller which provides GPS time sync, WSPR data, and audio. Currently I am running mono band at 1 two minute transmit cycle per 10 minute time block. Now I want to add KX3 band switching to my controller and increase my T/R duty cycle. Watching the PA.I current I see that my current 2 minute ON 8 minute OFF cycle shows a 30c ON – 46c OFF temp range. Running a 2 minute ON 2 minute OFF cycle shows a stabilized 36c – 49c range after about 5 ON/OFF cycles, and running continuous transmit cycles stabilizes at 48c – 53c after 6 cycles. So based on these 3 duty cycles I see a 16c, 13c, and a 5c temperature rise. The 2 on/8 off has the lowest max temp but the widest temp range, the continuous transmit has the highest max temp but the lowest range. My plan would be to have my controller switch the KX3 through 5 bands transmitting the 1 minute 53 seconds on a band and switching to the next band during the 7 second opening.
I have done extended temperature calibration with the XG50 so frequency stability should not be a issue.
My question is, 53c (127f) is hot, are there any thermo stress issues to the PA or the KX3 in general with running any of these three duty cycles? Obviously I don’t want to damage my KX3.
Tnx
George
WD0AKZ
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