Clear Wayne, tnx. I consider this a "don't try this at home" ;-) Smart solution btw!
73' Paul PD0PSB wayne burdick wrote: > > Hi Paul, > > Just plugging in a mono plug by itself is not detectable in firmware. > The protection kicks in as a result of a brief spike in AF amp current > drain. To observe this you need a mono plug, SPKRS=2, and moderate to > high volume setting with a strong signal in the passband. This will > eventually cause the AF amp chip to draw 1/2 to 1 amp of current on > peaks, which firmware can easily spot. > > I wouldn't suggest forcing this condition intentionally. We tested it > on several K3s, and we know it works. But it is intended as a safety > feature, not as a substitute for using a stereo speaker plug when SPKRS > is set to 2. > > 73, > Wayne > N6KR > > On May 21, 2009, at 7:54 AM, pd0psb wrote: > >> >> Anybody else tested this? >> I can't get speaker protection to work. >> Or does it only work with higher AF levels? >> >> 73' >> Paul >> PD0PSB >> >> >> MCU 3.14 / DSP 2.16 May 9, 2009 >> >> * SPEAKER PROTECTION: If you’re set up for stereo speakers >> (CONFIG:SPKRS = 2), but insert a mono speaker plug, the right >> speaker output will be shorted to ground. This can cause excess >> current drain if you turn volume up to high levels. The K3 now >> detects this condition, automatically turning off the right >> channel (and briefly flashing "SPRKS=1"). (It would be better, >> of course, to use a stereo plug if you set SPKRS to 2, rather >> than wait for the firmware to detect the mono plug.) > > > --- > > http://www.elecraft.com > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > -- View this message in context: http://n2.nabble.com/K3-beta-firmware-revision-3.14-now-available-tp2878791p2952720.html Sent from the [K3] mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
