[Elecraft] K2 KPA100 LP filter question

[Don Wilhelm]

LS,
There are no RS-232 signals on the ribbon cable.  TXD and RXD are at 
CMOS levels through the ribbon cable and the conversion to RS-232 levels 
is done on the KPA100 board.
BTW - the AUX I/O connector on the KPA100 (and the KIO2) is just what it 
says - it is NOT an RS-232 connector although it does contain 3 RS-232 
level signals - TXD, RXD and Signal Ground.  The remaining lines are K2 
dedicated and are used for communicating with external Elecraft 
equipment such as the KPA100, XV transverters, and the KRC2.
Plugging a standard PC computer serial cable into this AUX I/O connector 
can damage the K2 - build and use only the cable specified in the KPA100 
(or KIO2) manual.

73,
Don W3FPR

lstavenhagen wrote:
> Ok thanks Don.
>
> BTW, am I correct in observing that only the RF cable to J1, the power cable
> to J4, the audio cable and the ribbon cable to the control panel are the
> only connections of the KPA100 to the K2? I.e. does the RS-232 interface go
> in through the ribbon cable?
>
> Looks like it's an easy affair to swap lids and turn it back into a normal
> 10W K2 with just these connectors?
>
> Tnx es 73,
> LS
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