[RTTY] K or carriage return

[Al Kozakiewicz]

I don't know for sure why, but I observe it dozens of times in any contest.  I suspect the interface design.  A character is probably still in the serial interface buffer but the software thinks it's done sending and drops the PTT.  PTT shouldn't drop until the interface buffer is empty.  You can't always do that reliably if you're relying strictly on computer software to control everything - you might need to add a one-shot delay after the last character is pushed to the interface before you drop PTT.

Since I can't be sure that my interface isn't causing a problem, I add the space just to be sure.

Al
AB2ZY

________________________________________
From: rtty-bounces at contesting.com [rtty-bounces at contesting.com] On Behalf Of Bill, W6WRT [dezrat1242 at yahoo.com]
Sent: Monday, February 14, 2011 2:23 PM
To: RTTY contest group
Subject: Re: [RTTY] K or carriage return

ORIGINAL MESSAGE:

On Mon, 14 Feb 2011 13:37:15 -0500, Al Kozakiewicz
<akozak at hourglass.com> wrote:

> I add a space character to the end of my transmission specifically because I know the last bits are the most likely to be dropped.

REPLY:

I hadn't heard that before. Could you please explain why?

Thanks,

73, Bill W6WRT
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