Re: [TSCM-L] {3355} Re: The Manchurian Microchip - Urban Legend

From: Its from Onion <areda..._at_msn.com>
Date: Tue, 17 Feb 2009 22:59:09 -0600

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Subject: Interesting Signal Mode - Part 3 of 3 Parts
From: wilson_9748 <reginal..._at_hotmail.com>
To: TSCM-L Professionals List <TSCM-..._at_googlegroups.com>
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Part 3 and Conclusion of article in Monitoring Times.

"Beating the Slots

I learned a lot, watching Sigmira attack the XSL transmissions. He
calls the mode JSM, for Japanese Slot Machine, which seems as good a
name as any. He's included a nice clean sound file for practice.
That's a great idea, given our current solar conditions.

The real revelation comes from looking at Sigmira's 'phase plane'
display. A very strong and stable QPSK signal should settle down into
a cross pattern. XSL doesn't do that. The idler's repetition of phase
states, rather than characters, causes part of the cross to disappear
in sync with the audible notes. This 'music' is obviously an artifact
of XSL's unique keying.

When everything is going well, the decoded marker frames scroll madly
up the receiving window. Data intervals, which typically start around
frame 32, are easy to pick out. Most often, we see a 4-frame structure
with two control frames and two data frames. There's also a longer
payload that appears to link frames into a continuous bit stream.
While it's not STANAG 4285, the lack of clear data framing gives it
that same jet-plane fading noise. While it retains XSL's tight timing,
there's usually a re-sync after one of these.

Since the message in these transmissions are still carefully hidden
from the public, one can justifiably ask what we get in the way of
real-world information from this whole exercise. The answer, of
course, is nothing at all. The real content is a better understanding
of modern military communications. It's also the fun of being able to
participate in the technical ingenuity whch makes radio so compelling.

Good decoding!

XSL FREQUENCIES:

The six long-range, continuous frequencies in the original discovery
are still your best bets, and I've marked these with a star (*). Right
now, in April, 6445 and 8588 kHz are strongest in Southern California.
They peak around sunrise and hold up into early morning.

All frequencies are tuned in upper sideband (USB). These are dial/
winidow readings. With Sigmira configured per the manual, your channel
center is 1 kHz higher. Not all frequencies are broadcast
continuously.

THe full list is as follows:

3058
3075
4153
4231.5*
4280.5
4291*
5643
6250
6417*
6445*
6500
6693
6714
6768
8255
8313
8588*
8703.5*"

The End.
..............

Reg Curtis
Received on Sat Mar 02 2024 - 00:57:21 CST