[Spooks] Sam Again...More Thoughts

[Dave Taylor]

Hi Everyone:

Initially, I had difficulties understanding how an amateur--even a very
smart one--could generate Sam's data transmission (the "buzz").

Clearly, it is some form of QAM variant (PSK and AM combined), as it =
shows
amplitude, frequency, and phase variations.  These protocols are very =
hard
to generate cleanly with PC software, and do not lend themselves to the
venue of amateur SWL hackers.

QAM usually is used with wireless and ADSL protocols, along with =
television.
It is not widely used on SW, unless by government.

But then I realized that "advanced-looking QAM" can be generated with
hardware such as a newer dial-up modem.  Eureka!  Just bring up a low =
baud
modem session over V.35, and a capacitance tap to your sound card, and =
it
looks like an advanced SW protocol, much like the Russian 93-tone OFDM.

If this is a SWL hacker, he is very ingenious indeed!

Perhaps we should institute a yearly "Varmint" holiday in his/her honor?

Dave :-)


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