[Elecraft] KIO2 -> KPA100/EC2 interconnect cable

[Don Brown]

Hi

I have built several K2/100's in this configuration. I used a 3 foot 
standard 50 ohm BNC to BNC cable and the multi conductor cable and 9 pin 
connectors that come with the KPA100. I got the 50 ohm cable a radio shack 
already assembled with crimped on connectors. If you do not have a KAT100 in 
the EC2 box you will need to install a chassis mount BNC on the back of the 
EC2 for the KPA100 RF input. Order an extra 2 pin male connector like used 
on the K2 RF board for the AUX RF connector. Solder this connector to the 
chassis mount BNC connector. Then you can plug in the cable from the KPA100 
without needing to change out the cable in case you would ever want to 
reinstall the KPA100 into the K2 or if you later add the KAT100 to the EC2 
box.

If you also install the KAT100 in the EC2 box then the BNC RF in connector 
is on the KAT100 with an internal 2 pin connector for the KPA100 RF in 
cable. The 9 pin connectors on the KPA100 and KAT100 are internally wired in 
parallel so either can be used for the control. You will need the KIO2 
installed in the K2 to supply the control signals for the KPA100 and KAT100. 
You will also need a short (about 1 foot) 50 ohm jumper cable with PL-259 
connectors to connect the RF out of the KPA100 to the RF in on the KAT100.

If you need to connect a computer to the RS232 then you must use the output 
from the KIO2 as the RS232 driver in the KPA100 is not connected to the K2 
when mounted in the external box. You must build the special control and 
RS232 cables as described in the manual . Using a standard RS232 cable will 
damage the internal control IC's in the KPA100 or KAT100

Don Brown

KD5NDB


----- Original Message ----- 
From: "Steve Jackson" <kz1x at yahoo.com>
To: <elecraft at mailman.qth.net>
Sent: Saturday, January 14, 2006 10:10 AM
Subject: [Elecraft] KIO2 -> KPA100/EC2 interconnect cable


> For those of you who have built your KPA100 in an EC2
> (as a two-box configuration) what type cabe did you
> use to fabricate the interconnect?  And, more
> importantly, why did you select whatever cable you did
> use?  For example, did you use what was readily
> available, or did you buy a particular cable expressly
> for the purpose?
>