[Elecraft] KX3 Intermittent changes in audio gain

[Matt Zilmer]

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" <mzilmer at 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" <elelist984 at 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
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