Wednesday, November 11, 2009

Decoding Digital Ham Radio Without A Radio

Einstein once define radio this way;
"You see, [the] wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat."
Here is your your chance to do Einstein one better, no radio either!
  • Stuck in the Hotel room with no radio, because the airlines won't let you travel with your TS940?
  • Would you like to practice copying CW with Cyrillic alphabet but your QTH doesn't pull in Russian stations in the solar lull?
  • Test your new QRPp rig to see if you can be heard in Washington DC, or in the Netherlands.
  • Or how about, trying out Olivia or RTTY from your office during those brain numbing conference calls when you would prefer to listen to static?
Then check out Alex /oz9AEC excellently produced YOUTUBE  video on how use a WEB accessible Software Defined Radio (SDR) and your headphone and/or your favorite digiMODE software. The video demonstrates FLdigi (my favorite too), but DM780, or digiPAN, or anything would work too.

click here LINK

Nice Job Alex! Here is a link to the WEB SDR ORG


  1. I had a listen on the 40m receiver in Germany and it has the same awful background noise I've got at this QTH.

  2. Well funny you should mentioned that. -- I am sorry to hear about your noise -- but you know, that little soft-rock can really pull the CW out of central Europe quite 'sweetly'. However having said that, I've never heard (or seen) any SSB traffic on that unit. - On the site, the operator Gerolf Ziegenhain /DG6FL claims his noise is from the the PC power supply which is shared by the radio.

    Question - Can one easily measure ones own background noise level. -- AB3DI mentioned I have -106db, but I'm not sure how he came by his numbers to my QTH. -- Do you know yours?