Message-ID: <002d01c84cbe$d255e180$0e00000a@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <477AA0AB.1000300@w1tag.com>
Date: Tue, 1 Jan 2008 21:39:28 -0000
MIME-Version: 1.0
Subject: LF: Re: Keyboard modes for 600 meters
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John,



>From the test's ive carried out , the best mode would be a  simple 'arq' 
system



Non of the send and forget modes are of any use on 500 as you have no idea 
if the other end has even seen your signal ,let alone resolved it, that's 
unless the station is in ground range and then any mode works , full 
break-in cw is about as good as it gets , some of the multi tone systems 
give a longer 'clean period'  but under qso conditions , require long tx 
periods to  ensure you have covered at least one 'qsb' cycle



With the noise and deep qsb outage's I would think the best mode would be 
'amtor on prozac' with a prf of a few seconds , like a case clock



If only some one could write the source code  :  just replacing the 
conventional 'fsk' keying with 'psk' . the psk giving about 50 % better 
accuracy than similar shift 'fsk' and mimic the virtually bullet proof , 
protocol of  sitor/amto but simply calm it down a bit , so  it doesn't need 
a 'tnc' to  control the  tx/rx windows (bit of a oxymoron that as its 
windows that causes the timing problems)  ... thanks bill ..



This simple narrow mode would simply work at 30 bauds or so and basically 
sit pinging the other end during the outages till it responded , 'link up' = 
game on .  In a response to  a post on the 'multipsk' user site, some one 
did repy that they where working on a 'psk-arq' system, but I never managed 
to  follow it up ..





Rgds



Graham



G0NBD








----- Original Message ----- 
From: "John Andrews" <w1tag@w1tag.com>
To: "600 meter group" <shmrg@piobaire.mines.uidaho.edu>; "Discussion of the 
Lowfer (US, European, & UK) and MedFer bands" <lowfer@mailman.qth.net>; 
<rsgb_lf_group@blacksheep.org>
Sent: Tuesday, January 01, 2008 8:20 PM
Subject: LF: Keyboard modes for 600 meters


> As many of you know, Jay Rusgrove and I have been running tests on a 
> variety of keyboard modes for use in the 500 kHz area. Our focus has been 
> on modes that work well for casual QSO's and possibly emergency 
> communication. Resistance to noise and fading has been a prime 
> consideration.
>
> While this is a work in progress, I have posted an article at:
> http://www.w1tag.com/600M_Modes.htm
>
> Comments and suggestions are welcome. Thanks very much to all who have 
> participated in the tests!
>
> John Andrews, W1TAG / WE2XGR/3
>
>
>
>
> -- 
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>