Message-ID: <3C2BBAA7.19A38181@ns.sympatico.ca>
Date: Thu, 27 Dec 2001 19:19:51 -0500
From: "john currie" <john.currie@ns.sympatico.ca>
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To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: 136
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Hi John  what time do they tx on 182.2?  I have sharp low pass filtor with break
at 150kHz but will try to listen for them
73 es HNY John VE1ZJ

John Andrews wrote:

> John, et al:
>
> >       About QRSS, DFCW es 7 freq .  I find qrss to be very effective.  I
> > believe DFCW is even more effective than QRSS because you can send info
> much
> > faster for the same signal to noise ratio.  This makes sense because
> although
> > it takes same time to send a dot but the dashes are 3 times faster.  It
> does
> > take up more spectrum space than QRSS but the greater  efficiency will
> either
> > get the info across faster during condx of QSB or the transmitter can go
> > double the dot length and get the info across in the same time as QRSS for
> 3
> > db improvement in received SNR.
> >      The &FSK however takes up 3 times more spectrum space es I dont see
> any
> > benefit in speed/SNR improvement
>
> After last night, I think I'm with you on this one. The DFCW mode is my
> favorite, thus far. With 7FSK, my brain has trouble with all of the stuff on
> the screen. There were a lot of extra dots and short lines mixed in with it
> yesterday, and I don't think I could have ever properly decoded the signal.
> The situation was more noise-free the night before, and I got the M0BMU id's
> without too much trouble. The visually-decoded modes depend heavily on your
> mind's pattern recognition capability. I think the 7FSK stuff exceeds that,
> especially in the presence of noise.
>
> On the other hand, what I saw of Steve Olney's Wajina (sp?) mode last summer
> was impressive, though I didn't have the information to decode it at the
> time. Hopefully, he'll be able to do more with it when the U.S. Lowfer guys
> turn into Hifers next summer.
>
> Regarding spectrum space, we've got a nice efficiency demo going in the U.S.
> at present, with three stations sending QRSS60 id's on 0.5 Hz spacing on
> 182.200 kHz. It's been fascinating to watch the propagation each night. And
> there's room for more in the screen.
>
> John Andrews, W1TAG