Ron: I have never had this problem. I often operate with the power supply off. I do have 75 AH of batteries connected to the K3. I sometimes operate for 3 to 5 days (intermittently) before turning on the power supply. Just my backup plan. 73, Ty, W1TF, K3 #696
--- On Sun, 3/1/09, Ron D'Eau Claire <[email protected]> wrote: > From: Ron D'Eau Claire <[email protected]> > Subject: Re: [Elecraft] K3 power loss: Last settings forgotten > To: "'Erik N Basilier'" <[email protected]>, [email protected] > Date: Sunday, March 1, 2009, 1:57 PM > Interesting Eric. > > That's one you might post to [email protected]. > I've not seen it here > and I suspect Wayne would be surprised to see it. (He > monitors that list > carefully.) > > Even though I frequently hit the POWER button switching off > the main supply, > when working on the K3 on the bench testing assembly > procedures, etc., I > often just "pull the plug" with the K3 live with > no ill effects. > > Indeed, the one problem with shutting down the K3 that > I've seen was that if > the power supply wasn't turned off, a few K3s > wouldn't turn on again later! > That was traced to small current leakage through the KPA3 > that managed to > keep the CPU partially "alive" so it never did a > complete shutdown. But > that's just the opposite. Turning off the main supply > "fixed" the problem > (it's also fixed by the addition of a 1N4148 diode as > described in > http://www.elecraft.com/K3/mods/KPA3_12V_Sense_Modification_Rev_A.pdf) > > Ron AC7AC > > > > -----Original Message----- > From: Erik N Basilier [mailto:[email protected]] > Sent: Sunday, March 01, 2009 10:44 AM > To: Ron D'Eau Claire; [email protected] > Subject: Re: [Elecraft] K3 power loss: Last settings > forgotten > > Ron, I have been shutting down the external power rather > than using the K3's > power switch hundreds of times, a habit I established with > earlier radios. > I am comforted to know that you have also shut down your K3 > in a similar > way with no ill effects. But one thing now comes to mind > that I didn't think > about previously. Twice in several months of having the K3 > I had a problem > where the radio seemed disconnected from the antenna and > showed a high > swr on transmit. I jiggled the connector pins at the > automatic tuner board > etc. to no effect. At the first instance, the radio just > started working > normally > after I used its power switch to power down and back on > again. The second > time (months later) I had to reload the firmware to get > back to normal. > Of course, there is nothing to say that either incident had > anything to do > with > how the radio was shut down, just something that came to > mind. If there > were a chance of corrupting the firmware by unexpected > power loss, then > it would have implications for portable operation where > alligator clips > happily jump off of battery terminal posts etc. > > 73, > Erik K7TV > > ----- Original Message ----- > From: "Ron D'Eau Claire" <[email protected]> > To: <[email protected]> > Sent: Sunday, March 01, 2009 11:04 AM > Subject: Re: [Elecraft] K3 power loss: Last settings > forgotten > > > > And the K3 is pretty resistant to the sort of > craziness some CPU's > > experience with unexpected shutdowns. > > > > I'm not aware of anyone who has had a > "crash" of the system due to the > > power > > being pulled unexpectedly. I've done it hundreds > of times working with my > > k3 > > without any ill effects other than, as you noted, some > front panel control > > settings may not be stored. > > > > FWIW that's true of the K2 as well. > > > > 73, > > > > Ron AC7AC ______________________________________________________________ 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
