[Elecraft] KX3 Intermittent changes in audio gain

[Keith Heimbold]

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" <mzilmer at 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" <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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