One reason is called the inverse square law.
There's a HUGE difference in a rig being able to deal with a kilowatt signal a couple blocks away and being able to deal with a kilowatt signal in the same room. Another is that almost everyone who doesn't want to destroy their rig's front-end uses giant bandpass filters in front of each rig in a SO2R setup. Including eleven of these filters to cover all the bands the K3 will cover would make it the size of a broadcast transmitter. For reference for the HF challenged, take a look at a good set of repeater duplexers. Now, multiply that by eleven bands. It's one thing for a 2 meter/440 rig to be able to transmit and RX at the same time- they're running maybe 50 watts at 300 mHz spacing. It's not so easy with a rig running 100 watts, a kilowatt, or at some stations, several kilowatts at 2 or 3 mHz spacing. Hopefully this helps.
73,
Scott, N9AA

Bill Coleman writes:
Question: If the K3 can do this, then why can't it do SO2R in one box? All that is required is for the second receiver to be able to receive (likely on a different band) while the transmitter is transmitting.
Bill Coleman, AA4LR, PP-ASEL        Mail: [EMAIL PROTECTED]
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901
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