Specifications

CHAPTER 10
SIGNAL IDENTIFICATION AND TDM OPERATION
10.1 Overview
As you tune across the High-Frequency bands these days you find an
ever increasing number of digital signals. These signals range from
the simple Murray Baudot code to ASCII and even packetized data. With
the large number of speeds, formats and shifts now in use, it is
difficult to determine what kind of signal you are listening to. Even
with a knowledge of digital communications, it is still time-consuming
to set the communication parameters correctly.
SIAM stands for Signal Identification and Acquisition Mode, and allows
a wide variety of digital signals to be automatically analyzed so they
can be easily copied with the PK-900. SIAM will "listen" to a
signal for a few seconds and then display the type of signal and its
speed to the user. The user can then decide whether or not to copy
the signal, or simply go on to the next signal.
SIAM makes the PK-900 more useful to the radio amateur and the
Short-Wave Listener. Whether tuning across 20 meters, or searching
the Short-Wave bands, when you find a signal SIAM will help you decide
what it is, and tune it in without time-consuming trial and error.
NOTE: Outside the Amateur bands, many of the RTTY signals employ
sophisticated encryption schemes and are not copyable by the PK-900.
10.2 SIAM Operation
Before entering the Signal Identification mode, set the default modem
(QSIGNAL) to the number you wish to use from the list below.
1: RTTY/TOR 170: 2125/2295, 45 bps 2: RTTY/TOR 170: 2125/2295, 100 bps
3: RTTY/TOR 200: 2110/2310, 45 bps 4: RTTY/TOR 200: 2110/2310, 100 bps
5: RTTY/TOR 425: 2125/2550, 100 bps 6: RTTY/TOR 850: 2125/2975, 100 bps
7: RTTY/TOR 850: 2125/1275, 100 bps
If you are using an AEA PAKRATT program, follow the instructions in
the program manual to enter the Signal mode.
If you are using a terminal, simply type "SIGNAL" or "SI" from the
Command Mode followed by the <Enter> key to enter the SIAM mode on
Radio Port 1. The PK-900 responds by displaying the previous mode:
Opmode was XXXXX
Opmode now SIgnal
Now you are ready to tune in an unknown FSK signal.
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