[SD-User] CW speed variations

[Paul Bigwood]

Hi Richard,

Exactly the same thing happened to me when setting up for AFS last weekend.
Shack computer is a Pentium 100 running Win98.
First press of the F1 key CQ came out first at normal speed then slowed down
and increased up again. I ran calibrate which seemed to fix it for a while
then it started again.

It was then that I realised that I was running in a DOS box under Win98.

Rebooted PC to DOS and it never happened again. I think its something to do
with Win98 not allowing SD ( or any DOS program for that matter) to have
access / control of the serial ports, and if Windows decides to go off and
service some interupt while key is down, then CW gets slowed up.

Ran SD in DOS mode for the duration and no problems. Score wasn't brilliant
but thats me not
SD!

YMMV

73s de Paul G3WYW  mailto: g3wyw@kbcomms.demon.co.uk


----- Original Message -----
From: "Richard W L Limebear" <Richard@g3rwl.demon.co.uk>
To: <sd-user@contesting.com>
Sent: Wednesday, January 16, 2002 6:56 PM
Subject: [SD-User] CW speed variations


> Greetings
>
> Has anyone experienced speed changes while SD is transmitting ?
>
> The symptom, which occurred during the British AFS contest a couple of
> weeks ago, showed up like this:
>
> SD sending an exchange at normal speed, suddenly slows down, speeds up,
> slows down, speeds up etc. Speed was set at about 28wpm and dropped to
> (guess) about 15wpm just like hitting the speed control on an el-bug
whilst
> sending.
>
> System: SD 9.84 in a maximised DOS window on a W98 laptop. Happened twice
> during the 4-hour contest after, say, about 90 minutes of operating;
didn't
> have time to go into diagnostics, just rebooted and restarted.
>
> 73
> Richard W L Limebear G3RWL
> g3rwl@amsat.org
> FOC # 1188
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