[RTTY] Question?

[Jeff Blaine]

Chen,

I have noticed the similar thing a couple of years back and eventually found that my sound card for the TX side was slightly off vs. 
the RX side when the PC is really loaded (get warmer).  I can't recall but I think I was using the on board for the RX and a MDELTA 
for the TX.  So most certainly these things would drift with separate characteristics.

MMTTY has an option to put an offset and after trimming that my TX/RX sync was very good.

For guy seeing a constant offset issue, this is one thing they may want to check.

73, Jeff ACØC
www.ac0c.com

-----Original Message----- 
From: Kok Chen
Sent: Sunday, July 17, 2011 3:26 PM
To: RTTY Reflector
Subject: Re: [RTTY] Question?

On Jul 17, 2011, at 1:06 PM, Bill, W6WRT wrote:

> I wish - a forlorn wish - that AFC had never been invented. It does nothing you
> can't do with your main tuning dial. If nobody used AFC ever, the above problem
> would go away.

If developers are going to implement AFC, at least the crossed-ellipse display should show the pre-AFC version of the signal so that 
appliance operators at least know that they are not zero beat.

It is not as if that is any harder to implement in software than displaying a tuning indicator for a post-AFC signal.

BTW, K6LRN had mentioned to me off list that he is seeing a constant offset.  What are the chances that everybody has AFC turned on, 
and they are all doing S&P in the same direction?  When I found out that the problem went away when Dick applied a constant RIT at 
the rig, I suggested that his receive tone pair perhaps didn't match his transmit FSK tone pair.  That said, a real QSO outside of a 
contest should narrow down the problem.

73
Chen, W7AY

_______________________________________________
RTTY mailing list
RTTY at contesting.com
http://lists.contesting.com/mailman/listinfo/rtty