Buck Rogers K4ABT Manual del operador descargar pdf (Pagina 38)

The Packet Radio “2 N 1” Handbook by Buck Rogers K4ABT

Section 1; Packet Radio “The Basics” Section 2; The X1J4 System Node Operator’s (SNO) Handbook

Section II; TheNET X1J4 System Node Operators Handbook __ Page 38

DUAL-OR MULTI-FREQUENCY OPERATION:

To install a dual or multi-frequency TheNET X1 node, you should follow the previously described steps for each TNC.

Make certain that each TNC has a different callsign (often, only the SSID suffix changes). Verify that each TNC is

functioning correctly as a single-frequency node before attempting to interconnect the TNCs.

For a dual-frequency node, simply connect the two TNCs together, using a special RS232 cable wired as shown in the

diagram. (Don't try to use the host-terminal cable - it won't work!) A node/gateway interface cable is constructed using the

following diagram:

This gateway interface cable enables node communications between two X-1J4 nodes, port to port. This configuration

allows the SNO to bridge from one frequency to another, or from one baud rate to another, OR BOTH. Set the DIP switches

to the same RS-232 port baud rate. The DIP switches are located at the rear of the MFJ-1270B and MFJ-1270C TNC’s.

Most applications at VHF have the 1200 baud node DIP switches 5 & 7 ON and all others OFF. On the 9600 baud

node/port set DIP switches 5 * 8 ON, all others OFF. On the late model MFJ-1270”CQ” Turbo TNC’s the RS-232 baud

rate can be set at 19,200 baud. Be sure that both TNC’s have this capability, otherwise, use the RS232 port setting of 9600

baud.

This drawing illustrates how a user TNC and a node can

be interfaced to one radio. Some node sysops utilize the

home QTH transceiver for both their Packet station TNC

and the node TNC.

The interface cable above illustrates how the TNC2

clones that use the 9 pin (DE 9) RS-232 comports are

connected for gateway. This gateway application can

enable communications between two different

frequencies, two different baudrates, or both.

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Buck Rogers K4ABT Manual del operador Pagina 38