Steve,

If you have other non-resonant antennas, the easiest way to handle the resonant antennas is to simply connect those antennas to the ANT1/ANT2 jacks, and do a TUNE into those antennas then operate.

You can instead change the ATU menu parameter to either CAL P or CAL S and the L/C elements in the tuner will be bypassed. Note that the Pout parameter retains the last used L/C combination, so that is not a bypass situation.

You will not (and should not) use the BNC connector on the K2 lower panel next to the key jack when the KAT2 is installed because you will not have control over the output power (power will go to maximum and can destroy the PA transistors). Put a cap over that BNC jack.

Please refrain from calling that DE-9 connector on the back of the K2 a "serial connector" - it is NOT. Yes, it contains 3 wires that are compatable with RS-232, but it also contains internal K2 signals to connect external Elecraft hardware such as the KAT100, KRC2 and XV series transverters. To connect with a computer, you must use a special cable. If you did not receive that special cable to the computer with your K2, you can build it (you cannot buy it) from that shown in the KIO2 manual.

73,
Don W3FPR

On 4/16/2016 11:27 AM, [email protected] wrote:
I purchased my first Elecraft radio, which is a K2.  It has the auto antenner 
tuner, and some other options.  I have ant 1, ant 2, where tuner is and also 
antenna 50 ohm, and RCV Ant jack.  I have a couple antennas that I do not want 
to use tuner with, and was wondering which jack to use and then how to select 
it.

I am in the process of loading pictures of my K2, outside shot and inside 
shots, onto my QRZ page.  Please look and tell me what options I have too.

I think I have 160 addition, serial connector, antenna tuner, internal battery, 
and I don't know what else.

Thank you

Steve
KI4EZL
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