Ahhhh, those lovely days in May when a QRP’er can go to Dayton a few days early and enjoy the companionship of his fellow knack sufferers. One of the nice things about the QRP Amateur Radio Club International (QRPARCI) is their annual Dayton “Four Days in May” (FDIM).
FDIM is a great way to enjoy seminars and discussions on a whole range of topics. There was a really good presentation by Hans Summers (G0UPL) on QRSS. Many of you may be familiar with QRSS from podcasts such as “Soldersmoke”. Essentially, it’s CW so slow, it’s pretty much impossible to decipher by ear, but sent at a VERY low power (if you’re using a full watt, you’re probably just plain rude!!!!
You build yourself a little low power transmitter and usually use some sort CW keyer circuit of sorts to send your call, short message or whatever. The call is usually received by other hams and shared online. It’s kinda neat to see your low power signal making it’s way over long distances. It’s really a neat beacon.
Images are available on the web, but examples of reception are like below (from Hans Summers site):
Hans had a great discussion and was nice enough to produce a kit for FDIM (maybe he was earning his flight home, who knows!!!). The kits were INSANELY popular and I think he might have just made a huge jump in the use of this unique operating mode.
Hans painstakingly took orders from hams and even programmed their Atmel chips with their calls. What a nice guy!
He has plenty of information, schematics and such on his website. If you’re interested, point your browser to: