Many thanks once again Don. I agree with your thoughts, but KAT2 is currently a 'stand alone unit' with the RF connectors not connected. I'm only connecting J8.
So, like you, I am at a loss to understand what is happening. Even with a very strong (and loud) signal at the Rx input, no audio is present when J8 is mated with P4. Just a full scale reading on the S meter. Understood re "keying J8". 73 Peter G3XJS Don Wilhelm wrote: > > 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. >> >> > > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
