[Elecraft] KX3 Intermittent changes in audio gain

[Keith Heimbold]

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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