MFJ-1270C/1274C MANUAL ADVANCED OPERATION
Page 67
send data at 300 baud as at 1200 baud. If you use slow radio baud rates, you
should limit the length of transmissions by setting MAXFRAME to 1 and
choosing PACLEN so that the hardware watchdog timer does not disrupt your
transmissions and channel traffic is broken up frequently.
The Bell-202 compatible modem is optimized for a 1200 baud radio data rate.
The on-board modem is not useful at rates higher than 1200 baud. The MFJ
TNC can provide data signals up to 9600 baud, but an external modem is
required for operation above 1200 baud. Optional 2400 bps PSK and 9600 baud
modem boards are available from MFJ Enterprises, Inc. These high speed
modem boards can be installed inside the MFJ TNC. When an optional modem
board is installed and when it is in selected to operate the TURBO LED on the
front panel of the MFJ TNC will light. Contact MFJ Enterprises, Inc. for more
detail. For installation of an external modem, see APPENDIX F in this manual
for more details.
Special Protocol Times
You can set up a connection time-out with the command CHECK, which
specifies a time in multiples of 10-second intervals. This function prevents the
MFJ TNC from getting stuck in a connection when the other station disappears
for longer than the specified time. The MFJ TNC uses this time somewhat dif-
ferently depending on the setting of AX25L2V2.
The command RESPTIME sets a delay between the receipt of a packet and the
transmission of the acknowledgment packet. This delay is used to prevent
collisions between an acknowledgment and another packet from the sending
station. This is primarily necessary during file transfers; otherwise the delay is
best set to 0. During file transfers the stations receiving
the file should set
RESPTIME to 10 or 12 (default).
The timing of packet transmission in Transparent Mode is determined by the
command PACTIME. You can choose the way packet transmission is timed. If
you are typing input to a remote computer it is usually best to have packets
transmitted at regular intervals. If your computer is operating a remote-host or
bulletin board program you should send packets after an interval with no further
input from the computer. You can enable the use of PACTIME in Converse
Mode with the command CPACTIME.
Monitor Functions
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