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
JP
6
- 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
l2Vdc Loop
2
-3
ON
1
-2 *
Free Switch Output
1
-2
ON
2
-3
JP7, JP8, JP9
- Direct Outp
ut 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 30/9132/0002 OR LATE
R
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 D
B25 pin 7
2
-3
* = Standard Factory Configuration
