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Re: LF: 20 Years of QRSS

To: [email protected]
Subject: Re: LF: 20 Years of QRSS
From: [email protected]
Date: Sat, 1 Jul 2017 19:54:17 -0230 (NDT)
In-reply-to: <[email protected]>
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Good idea!  I will keep 137777 warm on this side of the pond and
watch on 136172.  It has been a long time since the last 2XTA on LF.


On Sat, 1 Jul 2017, Markus Vester wrote:

Perhaps we should have a QRSS weekend on Fri/Sat/Sun 14/15/16 July?
Any takers?
Sounds good, Mike!

Best 73,
Markus (DF6NM)

-----Urspr√ľngliche Mitteilung-----
Von: Mike Dennison <[email protected]>
An: rsgb_lf_group <[email protected]>; rsgb_lf_group 
<[email protected]>
Verschickt: Sa, 1. Jul 2017 23:11
Betreff: Re: LF: 20 Years of QRSS

I was involved in the naming of "QRSS". It is simply QRS (slow CW)
but the extra 'S' indicates "very", using the same syntax as "QRPP"
meaning "very QRP".

It is hard to imagine now what a breakthrough Andy and Peter's
experiments were, communicating over what were unheard of distances
in those days.

My first received QRSS involved a rather fast spectrogram (waterfall)
and a stopwatch as it scrolled off the screen.

I believe Andy and I had the first two-way QRSS QSO, and I certainly
had the first international QRSS contact, with ON7YD - also a
UK-Belgium first.

Perhaps we should have a QRSS weekend on Fri/Sat/Sun 14/15/16 July?
Any takers?

Mike, G3XDV

Looking back in my logbook I see on the 12 July 1997 that I made a
transmission on 73kHz that was received by G3PLX 393km away in a
bandwidth of a few tens of milli-Hz. Peter was using the new fangled
DSP stuff in a Motorola DSP card, to display the narrowband filtered
signal on a waterfall display.

I was radiating perhaps 5 - 10 milliwatts ERP (from a 200W

No information was exchanged that day, just confirmation of the
carrier being switched on or off using the telephone as a back link.
Peter suggested I write some software to generate very slow CW to key
the transmitter and send it to him.

On 27 July He received the first SLOWCW signal from me with positive
ID of the callsign, sent according to my logbook notes with 100s dots
between 0400 to 0718 UTC. We then did the same again for several
nights running, varying the dot speed . This completely smashed the
one-way distance record for the 73kHz band. There were several at
the time who said "its not real amateur radio, it's computers talking"
but those voices were soon silenced.

Others wrote software to generate the keying and suddenly everyone
started using SLOWCW which for some unfathomable reason started to be
called QRSS (why ?)

Now 20 years later, it still seems to be widely used, albeit with a
few variations like DFCW to speed up exchanges.

Andy G4JNT

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