Jim, Here's one possible explanation:
The external power supply must drop all the way to zero V, as must any all K3 I/O signals. This may have implications for attached equipment. If there's any residual voltage on the supply or I/O lines, even 1 V, the K3 may not turn off all the way. It turns out that the brown-out detection circuitry on microcontrollers can be confused at some power levels that are low enough to look like a brownout but not high enough to properly power the detection circuitry. Under such conditions the MCU may continue to run on power-down via the on/off switch, resulting in the radio drawing an unpredictable amount of current. If residual supply or I/O leakage isn't the cause, then I suspect a problem with your K3's on/off circuitry or possibly even the PA module. (You could test the latter theory by unplugging the KPA3.) Every K3 we've tested drops to a very small number of milliamps of current drain when off. 73, Wayne N6KR Jim Brown <[email protected]> wrote: > Nope. I measured both units several times, and just now repeated the > measurements. > > 73, Jim > > On 10/16/2013 11:23 AM, Eric Swartz - WA6HHQ, Elecraft wrote: >> Hi Jim - you must be misreading the meter by several decimal points :-) >> >> We just measured several K3s in the lab and they both draw less than 5 mA >> when off. >> >> Eric >> elecraft.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
