[Lowfer] QRSS Alternative
[email protected]
[email protected]
Tue, 1 Apr 2003 16:19:26 -0500
Well thank you sir!!
I think I have some webspace with my ISP. Just not sure how to get to it
yet!!
Would apppreciate
Thanks
Paul Cianciolo
W1VLF
Beacon " USA" 185.298.00 Khz
----- Original Message -----
From: "Jay Rusgrove" <[email protected]>
To: <[email protected]>
Sent: Tuesday, April 01, 2003 4:21 PM
Subject: Re: [Lowfer] QRSS Alternative
> Paul
>
> I can run a capture tonight and post it for all to see. One capture is
worth a
> ....
>
> Jay
>
> [email protected] wrote:
>
> > Hello Gary,
> >
> > Thanks for the reply and a chance to explain some of the things that I
> > surely have left out.
> > ----- Original Message -----
> >
> > > Have you done a Google search on DFCW AMATEUR RADIO ? You will find
lots
> > of
> > > comments about using it, but in amongst the hundred or so hits will be
a
> > few
> > > discussions on the hows and whys and pitfalls. The DF is dual
frequency
> > and
> > > easier to generate and would use less bandwidth. How do you generate
your
> > 5
> > > RF frequencies? If you are using a PC and soundcard, you need a SSB
> > > transmitter with good linearity vs a simple CW tx. Or go to a DDS
chip
> > and
> > > a micro-controller (which is what I would do)?
> >
> > Yes I have done the search and have found many articles about DFCW.
Some
> > versions seem to use no spacing and only 2 frequencies.
> > This gets confusing when you have several dots or dashes together along
with
> > band conditions fading. This method seemed easier from the persective
of
> > the position of the element determines the value of the element. By
using
> > the 5 freq I was able to eliminate all of the inter element spacing and
use
> > only inter letter spaces. Hence the 4 dots in a row would look like a
> > squarewave as they alternated between .0, .2, .0, .2
> > To further decrease the ime to send an ID the inter letter spacing of 1
> > element could be decreased further and still be effective.
> >
> > I am using a HP 3856b selective level meter as the basis for the
> > transmitter. These units can easily be locked to a 10 Mhz GPS reference
and
> > have a convienient tracking generator output on the back at 0DBM in 50
> > Ohms. This unit can also be instructed to move in .1 HZ increments.
> >
> > I alraedy had the HP SLM so I decided to write to it via the HPIB input
in
> > the back. This was a little harder than I thought it would be at first
and
> > I still have not master even this small amount of code. In addition the
> > element length and dot to dot spacing may leave some room for
improvement in
> > clarity.
> >
> > After getting accustomed to it, I have been able to read the code
easily
> > with out knowing the actual frequencies or spacings of the xmitter.
> >
> > Did I get everything? I wish I could post the JPEG I have so you guys
> > could get a look at it.
> >
> > Please more comments. BTW The "USA" beacon ID takes 11 min using QRSS
60
> > to ID.
> > W1VLF takes 27 minutes as apposed to 60 minutes using standar 3:1 QRSS.
> >
> > This advantage may just put that callsign in the midst of a prop peak
where
> > a 1 hour ID would not have survived.
> >
> > Thanks for the comments.
> > Would wyou like me to email a JPEG of the USA capture?
> >
> > Paul Cianciolo
> > W1VLF
> > Beacon " USA" 185.298.00 Khz
> >
> > > Why use 5 vs 3? A dot freq, a dash freq and a space freq. With fixed
> > > timing formats, we know when the changes are "allowed" to happen, i.e.
> > RTTY
> > > runs at a few speeds, right? 45.45, 75, 100 I think. No one is
sending at
> > > 82.3 or 69.1. If you are on the dot freq 3 time periods, and then got
to
> > > space, it is an S. If it goes to the dash freq for 1 period then
space,
> > it
> > > is a V. The 3 to 1 and inter-element spacing was for hand keying and
> > human
> > > ear decoding.
> > >
> > > But yes, there is merit in NOT having dashes 3 times longer than dots
and
> > > being able to tell dropouts from element spacing. What way to do it
is
> > the
> > > question <G>
> > >
> > > Gary WA6DTX
> > > ----- Original Message -----
> > > From: <[email protected]>
> > > To: <[email protected]>
> > > Sent: Wednesday, March 19, 2003 7:43 AM
> > > Subject: [Lowfer] QRSS Alternative?
> > >
> > >
> > > > Hello Folks,
> > > >
> > > >
> > > [snipped]
> > >
> >
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