KIO2 -> KPA100/EC2 interconnect cable

[Steve Jackson-5]

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?

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[Don Wilhelm-3]

Steve,

There are only 4 signals (AUXBUS, 8R, VRFDET, and 12CTRL) to deal with, so
only 5 conductors are needed. The cable supplied with the KPA100 or the KIO2
normally used for the computer connection (4 C + shield) will do the job if
you use the shield as the ground connection.  Since you need both the KIO2
and the KPA100 to mount the KPA100 externally, you should have 2 of these
cables already.

73,
Don W3FPR

> -----Original Message-----
>
> 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?
>
>

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[Don Brown-4]

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" <[hidden email]>
To: <[hidden email]>
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?
>
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