FMUSER INTERNATIONAL GROUP INC.
广州市汉婷生物技术开发有限公司
8
Both stereo encoder and FM transmitter with only one MPX connector provided - loopthrough mode.
It is recommended not to use this mode if any of the other connections are possible.
FM transmitter with integrated stereo encoder.
In case of mono transmission (no stereo encoder used) the RDS encoder input may be left unconnected (since there
is no need of external synchronization) or it may be used for the audio signal injection in the case that the FM
transmitter has only one input connector.
5.2 Jumper Settings
5.2.1 JP1 - Analogue part power supply
The jumper position depends on characteristics of the signal that is fed in the RDS encoder input.
Do not change the jumper position if the unit is powered! Disconnect the power supply first!
RDS Encoder Input
Conditions
JP1 position
Not used
-
1-2
Pilot tone
-
1-2
MPX signal
Signal level ≤ 3.3 Vpp
1-2
Signal level > 3.3 Vpp
2-3
5.2.2 JP2 - MPX loopthrough
Connect (short) the jumper only if you want to pass the input signal to the output of the RDS encoder (loopthrough
mode). In all other cases the JP2 must be open (turned off, no jumper present)!