[Elecraft] Elecraft K2

[Don Wilhelm]

Brian,

The web pages have gone away, but the instructions are quite easy.
First, you need the KIO2 installed in the base K2.

Build the KAT100-2, just follow instructions - build the cable for the 
KAT100 as instructed in the manual.  Test and align it with the K2/10 at 
10 watts - the RF output from the K2 will be from ANT1 if you have the 
KAT2 installed.

Then build the KPA100.  Do the alignment, test and calibration with it 
connected as normal to the base K2.

Then install the KPA100 in the EC2 enclosure.  It plugs right into the 
KAT100-2  You will have to remove pin 4 from the ribbon cable connector.

Connect a BNC to BNC cable between the base K2 ANT1 connector, a short 
UHF to UHF cable between the KPA100 ANT jack to the KAT100 RF IN jack.  
The control cable connector with the two cables plugs into the KIO2 and 
the other male connector plugs into either the KAT100 or the KPA100 DB-9 
connector.

The K2 senses the presence of both the KPA100 and the KAT2 and 
automatically forces the KAT2 to bypass and ANT1.  Operation is 
automatic and seamless.
To use the K2/10 for portable operation, remove the BNC cable from ANT1 
and remove the control cable - the K2 will then revert to the 10 watt 
transceiver with the KAT2 active.

Normally in the external KAT100-2/KPA100 combination, the power for the 
KAT100 comes through the KPA100 APP power cable.  If you want to set it 
up so the K2 will revert to low power automatically if the AC powered 
large power supply goes down in an AC power failure, you must power 
*both* the base K2 and the KAT100 from a battery backed supply.  The 
switch to low power will then be automatic if the large power source 
goes down.

Even though the KPA100 duplicates the AUX IO port of the KIO2, the 
computer connection part of that connector will not be functional when 
mounted in the EC2 enclosure.  Computer communications must be from the 
KIO2.

73,
Don W3FPR

On 1/4/2015 12:42 AM, Brian Denley wrote:
> I am building a KAT100 and KPA100 in an separate EC2 housing.  There used to be some websites with details on this arrangement but I can no longer find them.  As I understand things, the KPA100 / KAT100 will operate from the KIOS cable but do I need to disable my KAT2?
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