[Elecraft] [ELECRAFT] K2 don't communicate with KPA100/KAT100(in same EC2)

[Don Wilhelm]

Bo,

Since the base K2 works properly with the KAT2, I doubt you have a 
problem with Control Board U6.  Make sure you do have power control with 
the base K2 and KAT2 in place - set the power for 5 watts and connect an 
external wattmeter to see what the actual power may be - you should 
measure close to 5 watts.

Check the KIO2.  The inductor L1 on the AUX2 board and inductors L2, L3 
and L4 on the KIO2 board should show continuity - if not replace them.

Your pin misalignment would have placed 12 volts onto the VRFDET line to 
the KPA100 - if your luck runs good the KIO2 inductors may have acted as 
a fuse, but it is possible that KPA100 U6 could have been damaged.

It may be informative to remove the QRP top cover and connect the KPA100 
(removed from the EC2 enclosure) directly to the base K2 to check its 
operation and ability to control power in the above 11 watt range.  If 
you do not have good power control with the KPA100 connected directly to 
the base K2, replace KPA100 U6 and check again.

73,
Don W3FPR


On 8/1/2016 1:42 PM, Bo Andersson wrote:
> My K2 and KPA100/KAT100 have served me for over 10 years now without any problem!
>   
> After that I made the frequency calibration of K2 I made a mistake when I put contact from KIO2 and KAT2 to Control board. I put the Contact one unit up, pin 3 from KIO2/KAT2 come on pin1 on P4.
>   
> When I put all together and test, KPA100/KAT100 (both in same EC2) don’t respond.
>   
> Using Ant ½ I got answer ”PA ANT 1” also when I use menuitem ”ATU” I got the same answer ”PA ANT 1”
> I hear a relay click in KPA100 when I switch on the radio.
>   
> Testing single K2/KIO2/KAT2 all work well.
>   
> Testing K2/KPA100 got 20 W with 1 – 10 W on powerbutton and full power on over 10 W.
> Can’t change power with the powerbutton.
>   
> Perhaps U6 on Control Board is out of order! I measure all pin and got som differens against value in the manual.
>   
>