Lou,
It is likely that you can simply parallel the devices (connect to the K2 DOT
input) and set the K2 for 'INP Hand', as long as one device does not
interfere with any of the others.
Before attempting it, do check for the presence of voltage from each device
to be connected. If you have any voltage present, you may have to make some
alterations. Ideally you should have an open collector transistor (or relay
points) driving the output line (this is the case on most keyers or computer
interfaces, but it is worthwhile checking to be certain). You should be
able to connect from 4 to 10 open collector devices in parallel without a
problem - the actual number will depend on the driving transistor in each
device and just how much leakage current they have (collectively).
73,
Don W3FPR
----- Original Message -----
From: "Lou Roux" <[EMAIL PROTECTED]>
To: "Bob Tellefsen" <[EMAIL PROTECTED]>
Cc: "Elecraft Reflector" <elecraft@mailman.qth.net>
Sent: Thursday, October 21, 2004 12:38 PM
Subject: Re: [Elecraft] K2 auto-detect feature
Hi guys,
This discussion reminds me of something I've been wanting to for a while.
I don't use the internal keyer in the K2 but prefer my
own keyer and I'd like to parallel my computer/cw keyboard with it. What
kind of circuit would this require or could I just parallel
the lines together?
Thanks,
Lou - W6UR
K2/100 #3578
Bob Tellefsen wrote:
Vic
I built a little keying adapter in a small can to do this.
It has two jacks, one for my paddles and one for the
keying lead from my TR Log laptop. The laptop jack in mono, and the
paddles jack is stereo. The output is
a three wire lead to the key jack in the K2.
Inside the can are the two diodes that steer the single
keyline from the laptop to both the dit and dah lines
to the K2. The paddles connect direct to the dit and dah
lines. It's been working just fine at any speed I can handle.
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