[Elecraft] Cable length for KPA/KAT100 remote; importance of KPA100 upgrade

[Chris Kimball]

Just bought a fine used remote KPA100/KAT100 in an EC2 cabinet.  It's neat,
but I'd like to put it under the operating desk, rather than beside the K2. 
Can the K2 serial bus and the other 3 signals be extended for a total of 6
ft?  Any problem remoting the RF by the same 6 ft?

Alas, the KPA100 is of very early production, 2002.  How urgent is it to
apply the level Revision A, 2006 upgrade?  That is, what's the probability
of significant smoke production in reasonable (CW) use without first
applying the upgrade?

Thanks,

Chris
WB4WZR

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