[Elecraft] Made a DB15 cable to connect K3 + KAT500, but now Amp is disabled

[zl2ke]

I had to make a DB15 cable since my K3 is side-by-side to the KAT500, 
so the Elecraft cable that I ordered is too short (the DB15-Y cable is the 
only one available and it is for a K3 on top of a KAT500).

However now my SB-220 Amplifier is no longer activated and does not 'fire
up' when the K3 transmits. All was OK before I connected the cable that I
made today, that is, the K3 and KAT500 did trip the linear amp's relay.

The cable that I made today does connect the K3 and KAT500 properly, 
so that when I change bands on the K3 the KAT500 changes bands 
(and remembers the correct setting for each band so that no tuning is
needed).

Page 9 of the KAT500 manual shows the 10 Connector Pins to be used (leaving
5 pins unused), 
however I did not connect Pin #15 because the notation states "ALC (Not
normally used...).
This means that I have made a cable of 9 wires.

It is my understanding that pin #10 is the Key LIne from the K3, 
which should trigger the relay in my SB220 amp (via the KAT500).

There is an RCA-RCA cable from the K3's Key Out to the KAT500,
and another RCA-RCA cable from the SB220 to the KAT500.
This is the same configuration that I had prior to the new cable that I made
today,
and as I have said, the SB220 did fire up OK when the K3 transmitted.

I took care in making and testing the cable, so I am sure of the continuity
of each wire.

There must be something that I have not done. 
How can I get my K3 to once again trigger the SB220 amp?

Thanks,  Steve  ZL2KE



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