MFJ-1270C/1274C MANUAL INTRODUCTION
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INTRODUCTION
Thank you for purchasing the MFJ TNC Packet Data controller.
The MFJ TNC interfaces your radio with any personal computer that has an RS-
232 or TTL level Serial Port and a terminal program. While most
communications programs will work, MFJ recommends the use of MFJ Starter
Pack for those who have IBM or compatible, Macintosh, Amiga or Commodore
C64/128 computers. With an IBM or compatible computer, the MFJ Multicom
terminal program gives you added feature like VGA packet picture transfer
(IBM & compatible version) that a standard terminal program just can not offer.
This compact versatile controller employs the genuine TAPR TNC 2 AX.25
protocol packet firmware. Special firmware like ROSE, NETROM, TheNet are
compatible with the MFJ TNC.
In addition, the advanced new DCD circuit in the MFJ TNC has been optimized
for HF packet. It can be adjusted to ignore background noise while still being
able to respond to a valid data carrier. The new "packet collision prevention"
features -- Prioritized Acknowledgments and Slottime are installed. This new
technology helps prevent many packet collisions inherent in the current packet
protocol.
The MFJ TNC offers the most versatile mailbox available when compared to the
mailbox in other controllers. This mailbox allows dedicated mailbox callsign so
that the mailbox stays on while you operate packet. Other features like auto
forward or reverse forward mail to and from other BBS, remote sysop access,
sysop paging, mailbox ctext, chat mode and a "has mail" LED indicator. The
MFJ TNC has an 8K bytes memory mailbox. Mailbox memory is user
expandable to 32K, 128K or 512K by simply replacing the mailbox memory IC.
If you purchased the MFJ-1274C, you also get MFJ's 20- segment, 10 Hz
Precision Tuning Indicator that makes tuning simple for HF Packet.
The EPROM containing the MFJ TNC firmware is 256K bits. It is expandable
to 512K bit or 1 Megabits giving the MFJ TNC a lot of room to grow in.
A speaker jack lets you plug in a speaker and monitor both transmit and receive
audio. Speaker output also provides packet connect signal alarm.
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