Other than this occasional hiccup, yes. If you've got Fred's KX3 book, check 
out pages 146-147, especially figure 9.17 - this is exactly how I've got mine 
cabled up. 

Last night was a good example of why I wanted to have this flexibility. I was 
listening on 160 meter CW with the KX3 and heard W1AW/0 in Nebraska calling CQ. 
I cranked up the KX3 power to a whopping 12 watts and called him several times. 
Not so much as a QRZ did I get. I just got a CQ in my face! So, rather than 
turn on the K3, switch things over and tune in the station with the K3, I 
simply powered up the KPA500, set the KX3 to 9 watts (170 watts out on the 
KPA500), called him again and this time got him on the first call. I could have 
been there a very long time running 12 watts! Of course if I had a great 160 
antenna, 12 watts probably would have been OK. But I live in a CC&R/HOA 
neighborhood and have a "stealthy" Inverted L semi-hidden in the redwood trees 
that only has about 25-30 feet of vertical run.

Jim
On   Saturday, Jan 18, 2014, at  Saturday, 9:57 AM, Phil Hystad wrote:

> 
> Is the KPA500 really designed to work with multiple inputs even if they are 
> switched?  I would be interested in knowing since I also have a KX3.
> 
> 73, phil, K7PEH
> 
> 
> On Jan 18, 2014, at 9:25 AM, Jim Bennett <[email protected]> wrote:
> 
>> I recently got a KX3 and have set up my station such that the KX3 can share 
>> the KPA500, KAT500, and several antennas by using a pretty beefy Daiwa 
>> 2-position coax switch. The station is set up just like the diagram on page 
>> 147 of KE7X's KX3 book. This configuration seems to work very well. However, 
>> I've recently noticed a very occasional anomaly with the KPA500. Every once 
>> in a while, I go to power it on and nothing happens. I have to reach around 
>> to the back panel rocker switch, turn it "Off" and then back on. Then, the 
>> front panel power on button brings the amp to life. So far I've not been 
>> able to track it down to a particular sequence of operating events that 
>> precedes it. In the past 3-4 days, this has happened maybe three times.
>> 
>> Anyone else have this happen, and if so (1) what causes it, and (2) how to 
>> resolve it? Not a big deal, but I'd like to know what's going on.
>> 
>> Jim / W6JHB

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