Timewave DSP-232, Operating Manual

Page: 218 / 271

Chapter 12 PACTOR Operation
“ n ” 0 to 250 specifies the number of seconds to send an ARQ SELCALL before automatic transmitter
shutdown.
ARQTMO
sets the length of time during which your ARQ call will be sent, shutting down the transmitter
automatically after exceeding its value. As a general rule, if you can’t activate another AMTOR or PACTOR station
in the default time of 60 seconds, you can probably assume that the other station can’t hear your transmission.
ARXTor ON|OFF
Default: OFF
Mode: AMTOR, PACTOR Host: Ar
OFF
Disables the automatic detection of non-selected operating modes.
ON Enables automatic detection and switching between AMTOR and PACTOR modes.
ARXTOR allows the automatic switching from PACTOR Listen mode to AMTOR FEC receive and from PACTOR
Standby to AMTOR ARQ. It also allows the automatic switching from AMTOR Listen to AMTOR FEC receive.
With
ARXTOR ON
, an AMTOR FEC signal is detected by
ALIST
and
PTLIST
modes as well as AMTOR
Standby mode. AMTOR Standby, ALIST and PTLIST all use FEC idles to recognize FEC transmissions. In the
AMTOR Standby mode, however, FEC text patterns are recognized as an additional quick recognition method
which may speed locking onto a FEC signal.
ARXTOR ON
enables
PTLIST
mode to monitor AMTOR ARQ transmissions. It also means an incoming AMTOR
ARQ call is recognized in PACTOR Standby mode. Only a call for the selcall in MYSELCAL is recognized;
PACTOR can’t detect ARQ calls to
MYALTCAL
or
MYIDENT
.
When a PACTOR mode detects an AMTOR transmission, there is an added delay before the text is shown. Your
TNC must switch from PACTOR to AMTOR, where the signal is again detected. For fastest detection of AMTOR
FEC, your TNC should be in the AMTOR Standby mode. For fastest syncing on AMTOR ARQ signals, the TNC
should be in
ALIST mode.
At the end of the new mode (AMTOR ARQ or FEC), your TNC returns to the original monitoring mode (
AMTOR
,
ALIST , PACTOR or PTLIST ).
ARXTOR is defaulted OFF to accommodate old application programs that have no provision for handling a
spontaneous change of modes from PACTOR to AMTOR.
Here’s a summary of the AMTOR/PACTOR mode switching:
Original Operating Mode
Target mode detection AMTOR ALIST PACTOR PTLIST
AMTOR FEC if RFEC if ARXT if ARXT
AMTOR ARQ ( MYSELCAL ) always if ARXT
AMTOR ARQ (
MYALTCAL
) always
AMTOR ARQ ( MYIDENT ) always
Monitor AMTOR ARQ always if ARXT
SELFEC always if ARXT if ARXT
Monitor SELFEC if SRXALL if ARXT & SRX if ARXT & SRX
PTCONN always always
Monitor PACTOR always
Note: When automatically switching from PACTOR to AMTOR and back again, the modem isn’t
changed.
12-10 September, 05