[Elecraft] K2 - Problem With KAT2 Installation

[Don Wilhelm]

Peter,

While I should say "That can't happen", it obviously is happening.
There is no signal on the P4/J8 connector that should cause those symptoms.
It sounds like, when the KAT2 is connected, there is some signal being 
injected at the antenna which is causing the AGC to fully activate and 
that reduces the audio significantly.  I cannot conceive how the KAT2 
could create an oscillation, it is only an L network with parallel C and 
series L elements.

The other possibility is that somehow connecting the KAT2 is causing 
your K2 to go into transmit - that will create no audio and a deflection 
of the S-meter - However, if that were true, you could not navigate the 
menu during transmit, so I don't think that is what is happening.

Try connecting the cable to CB P4 but do not connect the KAT2 RF input 
(coax cable) to RF Board P6 - is the problem still present?  If not, 
then the KAT2 is picking up some strong local signal and injecting it 
into the receiver.

What I meant for the keying of J8 was to stick something in the pin 4 
position on the connector and it will be impossible to plug J8 into P4 
the wrong way.  Pin 4 has already been removed from P4 during the 
installation of the KPA100.  Use the same technique to key J8.

73,
Don W3FPR

Peter Barville wrote:
> Hello Don
>
> Firstly, my apologies as I am currently experiencing a few mail 
> problems, and this note won't 'flow' as part of the original message thread.
>
> I am very grateful to you Don for your reply. Over the years I can't 
> imagine just how many you have patiently helped.
>
> I obviously didn't explain the problem very clearly, but will try and 
> clarify things.
>
> J8 is oriented correctly, with the green wire towards the top. I have 
> checked the other end of the cable and confirmed there are no shorts, or 
> open circuits.
>
> As you suggest, P4 pin 4 has been removed as part of the KPA100 
> installation, but I'm not sure what you mean by "Since you have already 
> removed P4 pin 4 for the KPA100 you will have U8 also keyed."
>
> No doubt I'm being a little slow, but perhaps you would put me straight?
>
> To clarify the symptoms (I hope):
>
> With KAT2 *not* connected, the rig will power up and perform normally.
>
> With KAT2 *connected*, when I power-up the rig, the S meter goes full 
> deflection, and there is no audio output. However, the rig does allow me 
> to navigate to, and through, the KAT2 options.
>
>