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Re: LF: 20 Years of QRSS

To: Andy Talbot <[email protected]>
Subject: Re: LF: 20 Years of QRSS
From: Chris Wilson <[email protected]>
Date: Sat, 1 Jul 2017 17:46:40 +0100
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Hello Andy,

Well,  fascinating  history  there,  congrats on all that, but you are
showing  your  age a bit ;) What's this new WSJT mode "FT8" all about?
Too wide a bandwidth for LF, or of interest, anyone know much about it

Saturday, July 1, 2017, 5:34:05 PM, you wrote:

> 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 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

Best regards,
 Chris                            mailto:[email protected]

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