We're on (anniversary) travel, but found the doc here on the laptop: In Figure 2, take a close look at the KX3's DC power input. The DC to DC converter shown eliminates whatever power impurities remain at this end of the interior DC branch circuit. Being a boost-buck regulator, the converter can accept a wide range of input voltages and produces a steady 13.8VDC (adjustable). The converter used in this example installation is made by QSKJ (model QS-1212CCBA-80W). In addition to cleaning up the DC, the converter reduces voltage sag from the smaller gauge interior wiring. In order to prevent the converter from introducing its own emissions, a Laird LFB174095 ferrite core was used with 3 turns of the KX3's stock cable. This killed all converter emissions.
See http://ca.picclick.com/DC-DC-Converter-QS-1212CCBA-80W-Power-Supply-251036051706.html. 73, matt On Fri, 21 Sep 2012 16:24:43 -0700, you wrote: >Any recommendation or specific brand or place to purchase one for a KX3. >Appreciate the sharing of knowledge. > >Thanks, > >Keith >AG6AZ > >Sent from my iPhone please excuse typos > >On Sep 21, 2012, at 4:19 PM, "Matt Zilmer" <mzil...@verizon.net> wrote: > >> Yup. All you have to do is stabilize the power supply at the K3. I >> recommend a DC-DC converter for this. >> >> 73, >> matt W6NIA >> >> On Fri, 21 Sep 2012 14:22:26 -0700, you wrote: >> >>> Matt >>> >>> That's exactly what has happened I saw the high current flash I didn't see >>> it before because I was driving but I just saw it now so I think there's a >>> positive correlation. >>> >>> Thank you very much for the insight! >>> >>> Keith >>> AG6AZ >>> >>> Sent from my iPhone please excuse typos >>> >>> On Sep 21, 2012, at 7:18 AM, "Matt Zilmer" <mzil...@verizon.net> wrote: >>> >>>> The KX3 probably detected a HI CUR condition. This can happen because >>>> of high (or low) PS voltage due to automotive electrical fluctuations. >>>> Sometimes this can happen because of ground current with the antenna >>>> connected, so check this for a positive correlation. >>>> >>>> You should not see HI CUR while on the KX3's internal batteries. This >>>> proves the automotive supply is caused it. >>>> >>>> When the KX3 sees HI CUR (usually something higher than 300 mA on RX), >>>> it will flash that HI CUR message on VFO A. If the condition >>>> persists, it will drop the AF gain to some predetermined value. If >>>> the condition continues beyond that point, the KX3 will shut itself >>>> off to protect itself. In my own case, both the AF gain and >>>> self-shutdown events were happening. HI CUR is preventable in a >>>> mobile setting - see below. >>>> >>>> I produced a pretty good document on KX3 mobile ops, which I'm about >>>> to add to. It's posted on the Elecraft web site at >>>> http://www.elecraft.com/K2_Manual_Download_Page.htm#kx3_mobile. >>>> >>>> Keith, I saw that same type of problem while mobile with KX3 #6 right >>>> up until I installed a DC-DC converter. See the doc for details of >>>> all that. >>>> >>>> 73, >>>> matt W6NIA >>>> KX3 #6, K3 #24, etc. >>>> >>>> On Fri, 21 Sep 2012 05:45:18 -0700, you wrote: >>>> >>>>> I had this happen to me during mobile operations and not sure why either. >>>>> Signals dropped right out and then when I turned off the radio for a few >>>>> minutes and when i turned on the KX3 it went back to where it was prior >>>>> and remained that way. >>>>> >>>>> I will keep an eye on it to see if it happens again. >>>>> >>>>> Keith >>>>> AG6AZ >>>>> >>>>> Sent from my iPhone please excuse typos >>>>> >>>>> On Sep 20, 2012, at 7:43 PM, "Kevin Luxford" <elelist...@elitemail.org> >>>>> wrote: >>>>> >>>>>> Hi Guys, >>>>>> My KX3 has just developed an apparent fault - the audio level changes >>>>>> abruptly every few seconds from a comfortable listening level to quiet, >>>>>> but still audible. >>>>>> >>>>>> I am using my Proset headphones. >>>>>> >>>>>> Any thoughts on where I should start looking? I am nervous about poking >>>>>> around surface mount circuits! >>>>>> >>>>>> vy 73 >>>>>> Kevin >>>>>> VK3DAP / ZL2DAP >>>>>> ______________________________________________________________ >>>>>> 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 ______________________________________________________________ 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
