From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kevin Dawson Subject: Re: Which tone comes first? Date: Mon, 12 Jun 2006 15:08:04 +1000 Message-ID: <20060612050804.GC17169@glottis.kd> References: <448C6D95.2080007@sharon.esrac.ele.tue.nl> <448C71EA.60007@sharon.esrac.ele.tue.nl> Mime-Version: 1.0 Return-path: Content-Disposition: inline In-Reply-To: <448C71EA.60007@sharon.esrac.ele.tue.nl> Sender: linux-hams-owner@vger.kernel.org List-Id: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Linux-hams List On Sun, Jun 11, 2006 at 09:41:30PM +0200, Arno Verhoeven wrote: > On 2006-06-11 21:30, Dave Platt wrote: > >>I'm wondering which tone comes first when we start a sequence. Should it > >>start with 1200 Hz or start with 2200 Hz? Or doesn't it make any > >>difference? > > > >It really doesn't matter. Use whichever you wish, or switch > >deterministically or randomly on each individual packet transmssion. > > > Thanks. That's what I thought. But I'm having some problems with a > particular setup using a PIC to genrate the tones. I will have to play > with it some more... Some years ago, I had a project using a CML modem and found that it needed a few transitions for bit sync. It didn't matter what was sent - just the timing was needed. That may or may not be the problem in your case, of course, but if you can arrange for it, it might help. Kevin