My apologies, Ty. That was a personal reply to Eric I accidentally included on the list. I didn't intend to post it because only a very few K3's had the "power off" issue I mentioned and it's been addressed.
In your case pulling the "big switch" leaves you fully operational with that battery system, Hi! I'm considering something like that myself for the operating desk. Ron AC7AC -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ralph Tyrrell Sent: Sunday, March 01, 2009 12:28 PM To: Elecraft@mailman.qth.net Subject: Re: [Elecraft] K3 power loss: Last settings forgotten 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 <r...@cobi.biz> wrote: > From: Ron D'Eau Claire <r...@cobi.biz> > Subject: Re: [Elecraft] K3 power loss: Last settings forgotten > To: "'Erik N Basilier'" <ebasil...@cox.net>, elecraft@mailman.qth.net > Date: Sunday, March 1, 2009, 1:57 PM > Interesting Eric. > > That's one you might post to k3supp...@elecraft.com. > 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:ebasil...@cox.net] > Sent: Sunday, March 01, 2009 10:44 AM > To: Ron D'Eau Claire; elecraft@mailman.qth.net > 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" <r...@cobi.biz> > To: <elecraft@mailman.qth.net> > 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ 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
