On Fri, 03 Jun 2005 10:01:39 -0400, Buck wrote:

On Thu, 02 Jun 2005 12:33:44 GMT, Bob Miller
wrote:

On Thu, 02 Jun 2005 02:11:44 -0400, Buck wrote:



Each radio has it's own finger-print that the FCC can read. Many
times, they can tell the make and model by the signature before ever
seeing the rig. I would think that the most popular HF mobile rig
ever is recognized by the FCC.

Rig fingerprint? How does that work?

bob
k5qwg



I don't know, the FCC mentions them in letters to the owners of the
rigs they are requiring inspection on.

It's called "signature analysis". Every emitter, whether the human
voice, a transmiiter or a piece of vibrating machinery puts out its
vibrations in a unique pattern that can be determined by careful
analysis of the signal. There are mathmatical analysis tools that can
break down the patterns into frequency bands and time signatures that
all together, show that your Icom IC-706 MarkIIG is uniquely different
from my friend's. The math isn't particularly difficult, there are
specialty chip sets that will do it. The trick is doing it fast and
accurately enough. The "waterfall" display in WINPSK is doing the
math, but only enough to show the signals and decode the PSK protocol.
If it were accurate enough it would show the differences between all
the transmitters.

Russ - kf4wxd