Interface URI to Motorola
For all of these configurations, if you wish to connect an EEProm to save parameters, please see https://wiki.allstarlink.org/wiki/Interface_EPROM_to_URI
Motorola Desktrac Repeater - Flat audio
Tie Desktrac 20 and 21 to Desktrac 8
Tie URI 22 to URI 24
URI 1 - Desktrac 13
URI 12 - Desktrac 22
URI 20 - Desktrac 6 (Gnd, Shield)
URI 21 - Desktrac 23
URI 25 - Desktrac 3
Motorola Desktrac Repeater - Processed audio
Tie Desktrac 20 to Desktrac 8
URI 20 - Desktrac 6 (Gnd, Shield)
URI 21 - Desktrac 15
URI 22 - Desktrac 16
URI 1 - Desktrac 19
URI 8 - Desktrac 9 (COR Det.)
URI 7 - Desktrac 12 (CTCSS Det.)
Radius/Maxtrac series with 16 pin accessory connector - Simplex - Flat audio
URI 20 - Radius 7
URI 21 - Radius 11
URI 22 - Radius 5
URI 1 - Radius 3
Radius must have JU551 in position 'A'
(flat audio out).
Radius/Maxtrac series with 16 pin accessory connector - Simplex - Processed audio
URI 20 - Radius 7 URI 21 - Radius 11
URI 22 - Radius 2 URI 1 - Radius 3
URI 8 - Radius 8 (COR/CTCSS Det.)
Radius Must be programmed to output COR/CTCSS det. on
pin 8 of accessory connector, and JU551 in position 'B'
(de-emphasized audio out).
Pair of Radius/Maxtrac series with 16 pin accessory connectors - Duplex (Repeater) - Flat audio
Receive Radio
URI 20 - Radius 7
URI 21 - Radius 11
Transmit Radio
URI 20 - Radius 7
URI 22 - Radius 5
URI 1 - Radius 3
Radius receive radio must have JU551 in position 'A' (flat audio out).
Pair of Radius/Maxtrac series with 16 pin accessory connectors - Duplex (Repeater) - Processed audio
Receive Radio
URI 20 - Radius 7
URI 21 - Radius 11
URI 8 - Radius 8 (COR/CTCSS Det.)
Transmit Radio
URI 20 - Radius 7
URI 22 - Radius 2
URI 1 - Radius 3
Radius receive radio Must be programmed to output COR/CTCSS det. on
pin 8 of accessory connector, and JU551 in position 'B' (de-emphasized audio out).
Getting twice as much level from the URI
If your radio requires more then the output at pin 22 is capable of
delivering, you can take the wire that was going to pin 22, and move it
to pin 12, jumper between pins 22 and 24, and apply +12 Volts to pin 25.
This will pipe the output of the URI through the built-in 6db gain amplifier
and give you enough output level for your radio.