7.3.1 MPX generator settings
The mpx generator menu contains the following sub-menus:
Inputs/Outputs
MPX1 In Level Adjustment for external mpx input 1 reference level;
MPX2 In Level As above, for mpx input 2;
MPX1 Out Source Determines what signal is available on the MPX1 Output bnc
connector: MPX (internally generated, including RDS if
used), Pilot (the 19kHz stereo pilot), RDS (the internally
generated RDS signal, Ext 1 and 2 – a loop of the signals
being presented to the MPX 1 and 2 input connectors;
MPX1 Out Level Level adjustment of this output;
These menu items are reproduced for the MPX 2 outputs.
Generator
Pilot Level Level of the 19kHz stereo pilot, in % of total deviation;
RDS Level Level of the 57kHz RDS sub-carrier, in % of total deviation;
If you don’t wish to use the internal RDS encoder, please set
this to ‘off’.
Note that these two settings are based on the 100%
Modulation setting, in RF Settings. This is usually, in FM radio,
75kHz. Therefore a standard value of 9% pilot will produce
6.75kHz deviation, a setting of 3% RDS level will add a further
2.25kHz deviation, leaving 88% for audio. If your jurisdiction
allows greater than 100% modulation for sub-carriers above
38kHz, you will need to increase the 100% Modulation
setting and recalculate these figures.
comp (composite) clipper drive: -0.5 to 2dB
Pilot protection: on/off
7.4 RDS encoder
The V3 transmitter incorporates an RDS (RBDS in the US) encoder as standard.
This module allows full dynamic control of all RDS parameters, such as PI, PS and RT
(Program Identifier, Program Service – station name, and Radio Text).
Please note: It is possible to send data to the RDS coder via the RS232 port, or via the
Ethernet connection. If this is in use, the RDS coder treats this as locally-generated.
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