• Effective immediately we will be deleting, without notice, any negative threads or posts that deal with the use of encryption and streaming of scanner audio.

    We've noticed a huge increase in rants and negative posts that revolve around agencies going to encryption due to the broadcasting of scanner audio on the internet. It's now worn out and continues to be the same recycled rants. These rants hijack the threads and derail the conversation. They no longer have a place anywhere on this forum other than in the designated threads in the Rants forum in the Tavern.

    If you violate these guidelines your post will be deleted without notice and an infraction will be issued. We are not against discussion of this issue. You just need to do it in the right place. For example:

Modes CCIR493-4 being used again


Wiki Admin Emeritus
Jul 22, 2002
Bowie, Md.
Anyone that has been watching the UDXF logs has noted a very large increase in the use of CCIR493-4 (also known as CODAN selcall); this is a digital selcall mode that is evidently used in the maritime service. It seems that the activity in the South China Sea with the Chinese building artificial islands and bases. There has been an upswing in interest in finding new frequencies and looking at the selcalls. The SigIDWiki has a page on this mode, along with compatible software. Note that the free Rivet decoder as well as Sorcerer is listed as being compatible, so it's not necessary to get the multi-kilobuck packages for this. Here's the link...

CCIR 493-4 Selcall - Signal Identification Wiki

This is a good example of world events causing old modes to become active again....Mike