Jp2: Audio Response; Jp3: Audio Filter In/Out; Jp4: 600 Ω Line Dc Loop Cos; Jp6: Cos Polarity - RF Technology R220 Operation And Maintenance Manual

2.2

JP2: Audio Response

2.2 JP2: Audio Response
Condition
750 uSec. de-emphasis
Flat response
2.3

JP3: Audio Filter In/Out

JP3 bypasses the 300Hz high-pass filter and 240Hz notch filter if necessary.
Condition
Hi-pass, Notch In
Flat response
JP4: 600 Ω Ω Ω Ω Line dc Loop COS
2.4
JP4 allows the dc return path through the output audio transformer to be broken, to
permit dc signaling via the audio pair or wires.
Condition
dc Loop Configured by JP7, JP8, JP9
dc Loop Not used
2.5

JP6: COS Polarity

Condition
Active on Signal
Active on No Signal
2.6 JP7, JP8, JP9: dc Loop COS Configuration (JP4 1-2)
These settings are relevant when the Carrier Operated Switch (COS) signal is to be
used across the same wires as the audio. Refer to setting of JP4, in section 2.4. They
control the levels and connection into the audio balanced line circuitry.
Condition
Source +12 Vdc Loop
Free Switch Output
Page 8
2 RECEIVER INTERNAL JUMPER OPTIONS
Position
1-2 *
2-3
Position
2-3 *
1-2
Position
1-2 *
2-3
Position
2-3 *
1-2
JP7 JP8
2-3 ON
1-2 ON
JP9
1-2 *
2-3
RF Technology R220