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USER'S GUIDE
4.5
AMTOR Operation
From the Command Mode, type
AMTOR mode. The PK-232 will respond with the previous mode:
OPMODE
4.5.1
Transmit/Receive Function Keys
From the Command Mode:
ARQ (SELCAL)
FEC
SELFEC (SELCAL)
R
AM
AL
L
X
Embedded in transmission text:
<CTRL-O>
<CTRL-N>
<CTRL-F>
<CTRL-D>
4.5.2
Speed Change Not Permitted
In accordance with FCC Part 97.69 and international regulations, AMTOR is operated at
one speed only – 100 bauds. The PK-232 does not permit AMTOR operation at any other
speed.
4.5.3
SELCAL (Selective Sequential Calling)
AMTOR operating modes require a SELCAL (Selective Sequential Calling) code. This
unique character sequence must contain four alphabetic characters normally derived from
your call sign.
The convention originated by the early European AMTOR pioneers, and later adopted by
amateurs around the world, was broadly based on the most common "one-by-three" call
signs, and used the first and the last three letters of the call sign. However, with the re-
cent changes and expansions of the call sign systems in many countries, some comment
and explanation may be in order here.
Some call sign groupings now in use are:
PK232UG Rev. B 9/86
AMTOR
was ASCII
Starts Mode A selective call
Starts Mode B transmission
Starts Selective Mode B transmission
Stops transmission, forces AMTOR Standby
Stops transmission, forces AMTOR Standby
Forces re-synchronization in ALIST (AMTOR Mode A Listen)
Forces LETTERS case
Not used in AMTOR
Sends LETTERS character
Sends FIGURES character
Sends call sign in Morse and shuts off transmitter
Shuts off transmitter immediately
GROUP
CALL
1 by 2
W1XX
1 by 3
W1XXX
2 by 1
AA1X
2 by 2
AA1XX
2 by 3
KA1XXX
or AM, followed by
SELCAL
WWXX
WXXX
AAAX
AAXX
KXXX
4-9
OPERATING MODES
<RETURN>
to enter the
62
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