Hi Andy, LF!
Some information about QRSS, Andy.
Practically QRSS used more then 100 years ago!
I'm write aboute station in Nikolaevsk-on-Amur - Komsomolsk-na-Amure, russian
far east now:
"...Each station used equipment for RX by ears RX 15WPM and Morse apparat for
slow CW 5 words per minute on paper tape..." - 1910.
5 words per minute around QRSS-3 mode! -)
I'm reading also about first telegrafic line between England and NA - slow CW
used also too in 1855!
> 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
> I was radiating perhaps 5 - 10 milliwatts ERP (from a 200W transmitter)
> 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