Operating instructions

RECEIVER Jumper Options
JP1 - 240 Hz Notch Filter
Position
Notch Filter IN 1-2 * OUT 2-3 JP2 - Audio Response
Position
750 uSec. de-emphasis 1-2 *
Flat response 2-3 JP3 - Audio Filter in/Out Position Hi-pass & Notch In 2-3 * Flat Response 1-2 JP4 - 600 Ohm Line dc Loop COS
Position
dc Loop Configured by JP7, JP8, JP9 1-2 * dc Loop Not Used 2-3
JP6 - COS Polarity
Position
Active on Signal 2-3 *
Active on No Signal 1-2
JP7, JP8, JP9 - dc Loop COS Configuration (JP4 1-2)
JP7 JP8 JP9
Source +l2Vdc Loop 2-3 ON 1-2 * Free Switch Output 1-2 ON 2-3 JP7, JP8, JP9 - Direct Output COS (JP4 2-3)
JP7 JP8 JP9
+12 Vdc Direct Output 2-3 OFF OFF Free Switch Output 1-2 OFF OFF
JP11 EPROM Type
Position
27C256 2-3 * 27C64 1-2 THE FOLLOWING JUMPERS ARE VALID ON RX PCB VERSION 30/9131/0004 OR LATER JP13 – Squelch Defeat Position Squelch operation normal 1-2 * Squelch Defeat on active low input at DB25 pin 19 2-3 JP19 – LED Alarm output Position No alarm output 1-2 * Alarm LED signal output brought to DB25 pin 7 2-3
* = Standard Factory Configuration