OK I will take a stab at describing the cable. Please note I have not done
this yet so I am not sure of any problems that may arise.
You will need to order from Elecraft or from some other source the 10 pin
female connector with the pins that is used to connect the KAT2 to the
control board. Using a shielded 4 conductor cable install a pin and insert
into pin 8, 10 and 2. connect the shield and the 4th wire to pin 6. Connect
a .01 uf cap with short leads from pins 6, 7, and 8 of the female 9 pin D
connector to the metal back of the connector. Connect a jumper wire from the
metal back of the connector to pin 1. Then connect the wires from the cable
to the 9 pin connector pins. As in the chart below
10 pin 9 pin D
2 6 through a 15 uH choke
The AUX BUSS wire from pin 2 of the control board needs to connect through a
15 uH choke on the 9 pin D end of the cable. Connect the choke to the
junction of pin 6 and the capacitor and then connect the wire to the other
end of the choke. Use some shrink tubing over the choke to strengthen the
connection so the wire will not break easily. The circuit diagram of all of
this in in the KPA100 or KIO2 manual. Mount the 9 pin D connector to the
back of the K2 where the KIO2 would mount and plug the other end of the
cable into the control board IO connector
----- Original Message -----
From: "Wallace, Andy" <***@mc.com>
To: "'Don Brown'" <***@msn.com>; "Elecraft" <***@mailman.qth.net>
Sent: Thursday, November 14, 2002 8:50 AM
Subject: RE: [Elecraft] Re: KIO2 Required if you Remote the KPA100?
Post by Wallace, Andy
It is possible to make a cable that plugs into the control
board directly to
a 9 pin connector on the back of the K2 but you will need to
filtering in the KIO2 on the pins of the 9 pin D connector to
keep RF off of
the AUX BUSS and other control lines. You will need to come
up with your own
source of parts and connectors to make this cable and of
course this will
not supply any RS232 signals.
I would love to see a diagram of this -- even chicken scratches
on a napkin.
As I mentioned to Don earlier, if I buy the K2 I plan to use it as
a home station, so portability is not paramount. Therefore, I would
probably order the K2 to begin with, and add the KPA100 later on,
and mount it in the K2 cover rather than remotely. However, I would
rather buy the KAT100 tuner NOW, and use it with the QRP K2, since I
will use the tuner with the KPA100 later on.
My point is that it would be GREAT if Elecraft could come up with
a small kit for just such an interface -- running the KAT100 from the
low power K2, rather than having to spend $89 on a KIO2 and resell it
once I buy the KPA100 (which has the circuitry).
I am sure others have a similar desire.
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