Buck Rogers K4ABT Handbook page 39

Buck Rogers K4ABT
"2 N 1" Handbook
The Packet Radio by
; Packet Radio "The Basics" ; The X1J4 System Node Operator's (SNO) Handbook
Section 1 Section 2
To interconnect three or more TNCs as a multi-frequency node-stack, you should build a diode-matrix coupler. A
schematic for a four-frequency coupler is shown below. It uses 24 diodes (1N4148, 1N914 or equivalent).
Configuring a multi-frequency TheNET X1 node for three or more frequencies is almost as easy as dual-frequency
operation. A TNC2 with TheNET X1J4 EPROM installed is used for each frequency. Once again, the TNCs are
interconnected via their RS232 ports. Interconnecting three or more TNCs requires nothing more elaborate than some
isolation diodes between the RS-232 ports.
; TheNET X1J4 System Node Operators Handbook __ Page 39
Section II