I have seen some LPT ports that can not supply enough current to
work with the standard bipolar keying circuit. Measure the current
flowing into the base of the transistor and compare it to another
computer for verification.
John
k3ct@fast.net
-----Original Message-----
From: ct-user-bounces@contesting.com
[mailto:ct-user-bounces@contesting.com] On Behalf Of Bob Raker
Sent: Saturday, July 10, 2004 5:23 PM
To: ct-user@contesting.com
Subject: [ct-user] Paddle input on LPT port not working
I am making LPT / CW interface cables for the W1QK VHF contest
group.
Here's the problem - the paddle input does not work on his computers
(P100,
DOS6.2)- the Function keys will generate CW, though. The paddle
input works
fine on my laptop (486, WIN95). All computers are running a 10+
version of
CT for DOS. I have pull-up resistors - OC voltage measures ~5V on
both
computers.
Questions- are all LPT ports created equal? Is this is HW or SW or
OS
related? Has anyone encountered this issue? Any suggestions on
solving this
mystery?
TIA
Bob W0BR/1
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