[Elecraft] K3 transmit audio cuts out

[Adrian]

Keith, Did you ever look at the vfo B voltage display whilst transmitting to
check volt drop?

I would have thought the transceiver would turn itself off before the
transmitted audio ceased if you had a volt drop problem. The radio tends to
give you current warnings during these events as it tries to meet the power
level programmed. 

Using a short custom APP cable rated for 50 amps and 30 amp power supply
close at 15v is well worthwhile.
I run a 15v 30A  sw/mode on the P3  (Can't get much closer than that), with
a secondary supply from a 7 cell  LA battery bank with its own 15v 25A
linear PS.

Dons advice regarding the app connectors is great, but not sure if that was
your issue.
 The fact that you cleaned up the rfi area with no re-occurrence of the
issue says a lot.

Adrian ... vk4tux

Nb, list owners, 2nd attempt on this post, on previous I received;

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-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Keith Heimbold
Sent: Sunday, 29 July 2012 11:54 PM
To: don at w3fpr.com
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 transmit audio cuts out

Don,

I am pretty sure that we found the culprit. The APP connectors did not click
properly for the one set and I am examining the ones for the other. I will
need to be more diligent in making sure I get a good click inserting into
the plastic housing.

I spent a lot of time rooting out any RFI issues but I guess that is really
time well spent since cleaning up my shack and all the cables and wires is
probably a good idea.

Thanks,

Keith
AG6AZ

Sent from my iPhone please excuse typos

On Jul 29, 2012, at 6:34 AM, "Don Wilhelm" <w3fpr at embarqmail.com> wrote:

> Keith,
> 
> If your APP connectors do not mate with a bit of a *click*, then they 
> are
assembled incorrectly.  The blades of the conductors *must* be locked over
the tips of the spring fingers located in the housing.
> 
> Things come in threes so the sayings go, I have repaired 2 KPA100s in 
> the
last week which did not have the blades of the APP connector fully seated -
I am waiting on the 3rd one.
> 
> 73,
> Don W3FPR
> 
> On 7/28/2012 11:10 PM, Keith Heimbold wrote:
>> Don,
>> 
>> I am now starting to think that it is an issue with my power 
>> connectors
that I am using.
>> 
>> I bought some additional ferrites and put the balun design 1113u in 
>> line
to take care of RFI but i know believe that the power connectors are a
little intermittent at times. I don't always get a solid click when
inserting into the back of the K3 or into the power supply line. I like the
convenience of those type of connectors but they do seem to loosen up over
time.
>> 
>> Thanks again,
>> 
>> Keith
>> AG6AZ
>> 
>> Sent from my iPhone please excuse typos
>> 
>> On Jul 28, 2012, at 3:44 PM, "Don Wilhelm" <w3fpr at embarqmail.com> wrote:
>> 
>>> Keith,
>>> 
>>> You could also have a loose connection in your microphone cable. 
>>> When
operating SSB, if there is no audio, there will be no RF output.
>>> So you can look at the PTT, the audio, the power supply, and just 
>>> about
every thing else in your station.  Cables are usually the weak link.
>>> 
>>> 73,
>>> Don W3FPR
>>> 
>>> On 7/28/2012 5:34 PM, Keith Heimbold wrote:
>>>> Gene,
>>>> 
>>>> Great suggestion. It maybe the connector going into the rig or the
connectors which I built.
>>>> 
>>>> Thanks,
>>>> 
>>>> Keith
>>>> AG6AZ
>>>> 
>>>> 
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