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AllStar Link Network -- SANTIAGO BOARD

(Repeater/Link Tee Adapter)

A number of people that have an existing repeater and controller (either a stand-alone controller, or a multi-port link controller) wish to add app_rpt/Allstar Link functionality to their existing system, keeping their current controller in place. Those who have a mult-port controller with an available link port can merely connect a standard device (URI or other USB device, etc) directly to the available port on their controller, and that's it.

Some people, however, wish to do this but do not have either an available port on their multi-port link controller, or have just a single-port stand-alone controller. Obviously, this would not normally be possible. However, there is now board available that is essentially a "tee" adapter that goes in between either a repeater and a stand-alone controller, or between a link controller and a link device (such as a radio), and basically allows "sharing" of the existing controller's port to which it is connected.

This simple and inexpensive device is known as the "Santiago" board, and is currently available as a blank board that someone can buy parts for (a list of Digi-Key part numbers is provided) and can easily be assembled by an Amateur Radio operator.


"Santiago" Board, Rev. A (02/18/2011), Click on image to see it larger

It connects in-between a repeater and a stand-alone controller, or a link radio (or other device) and a port on a mult-port link controller. It also connects directly (and derives its DC power from) to a DMK Engineering URI (USB Radio Interface) for app_rpt/Allstar Link access.

All of the board design documents (schematics, layouts, gerbers, etc) are competely open and public, and may be Downloaded, if desired.

Anyone interested in obtaining a blank board (for $25.00USD), may contact me (Jim Dixon, WB6NIL) at admin@allstarlink.org.

Connector And Jumper Reference

P1 (25 pin male D-shell) connects to the URI.
P2 (9 pin male D-shell) connects to the existing controller (Port A).
J1 (9 pin male D-shell) connects to the repeater or link device (Port B).
J2 (4 pin AMP connector) is for optional control (reset/disable).
J3 (6 pin modular) is for programming the PIC microprocessor (ICSP).
      Don't mess with it unless you know exactly what you are doing.

P1 is specifically designed to connect directly to a URI (actually mounting the URI directly to the connetor, securing it with screws through the rear of the P1 connector).

P2 connects to the existing controller, and its pinout is as follows:

3 - PTT input from controller
4 - TX audio from controller
5 - RX audio to controller
7 - COR signal to controller
9 - GND

J1 connects to the repeater or link device, and its pinout is a follows:

3 - PTT output to device
4 - Tx audio to device
5 - Rx audio from device
7 - COR signal from device
9 - GND

P2 and J1 are intended to be compatible with LinkComm and other similarly pinned-out controllers (of which there are many). In other words, if you have one of these controllers, you may use a "straight-through" cable and just put the Santiago board in-line with what you already have, without making any special cables.

Jumpers:

JP1 - To be removed only if re-programming the PIC processor. Leave it alone.
JP2 - Invert "PTT from controller" input signal (normally left out) (normally low true).
JP3 - Invert "COR signal from device" input signal (normally left out) (normally low true).
JP4 - "COR signal to controller" polarity. Normally left on pins 1-2 (normally low true). Pins 2-3 will invert it.
JP5 - "PTT output to device" polarity. Normally left on pins 1-2 (normally low true). Pins 2-3 will invert it.
JP6 - Mode select. Jumper On is for "repeater" mode. Jumper off is for "link" mode.

Mode Descriptions:

For this purpose, "Port A" refers to the "controller" port, "Port B" refers to the "repeater or link device" port, and "URI" refers to the URI.

Link Mode (JP6 removed)

audio out to Port A = Mix of Port B audio in and URI audio in
audio out to Port B = Mix of Port A audio in and URI audio in
audio to URI = Mix of Port A audio in and Port B audio in

COR out to Port A = COR in from port B (OR) PTT in from URI
PTT out to Port B = PTT in from Port A (OR) PTT in from URI
COR out to URI = PTT in from Port A (OR) COR in from Port B

Repeater Mode (JP6 installed)

audio out to Port A = Port B audio in
audio out to Port B = Mix of Port A audio in and URI audio in
audio to URI = Port B audio in

COR out to Port A = COR in from port B
PTT out to Port B = PTT in from Port A (OR) PTT in from URI
COR out to URI = COR in from Port B

Control Connector (J2)

1 - Disable URI (short to ground to disable URI)
2 - GND
3 - GND
4 - Microprocessor Reset (short to ground to reset microprocessor)

Pin 1 is closest to adjacent board edge (on right looking at it from the front).

The URI can be completely disabled (being functionally taken "out of the picture") if pin 1 on the control connector is shorted to ground. In this mode, the board will basically be completely passive, and the two devices connected through it will operate as if they were directly connected to each other without the board even present.