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[CQ-Contest] CW keying interface

To: <cq-contest@contesting.com>
Subject: [CQ-Contest] CW keying interface
From: "Chris Tran ZL1CT" <zl1ct@gm7v.com>
Date: Thu, 2 Aug 2007 10:07:16 +1200
List-post: <mailto:cq-contest@contesting.com>
Hello all

I have to disagree about the quality of CW produced by *most* PCs running 
under XP Pro - I've tried a Winkey and could detect no significant 
difference with the CW produced (using Writelog or Wintest and LPT1) - it 
was good under all circumstances between 20 and 40wpm.

Can anyone help with suggestions about keying one of my boat-anchor radios - 
an FT-101E which uses grid-block keying with about -8V across the key. I'm 
using Wintest via the LPT port to drive a K3KU style interface (with a 
2SC640 as the PNP device) - I cannot achieve a sufficiently 'hard' 
earth/ground across the key contacts, even with the transistors saturated - 
the radio appears to key properly but the sidetone osc is not being 
activated. I don't want to use a reed relay circuit - maybe a MOSFET circuit 
would be better ?

73
Chris
ZL1CT / GM3WOJ


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