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FM-531HD / May 2013
F M - 5 3 1 H D P R O G U I
by raising its MPX Power detection threshold well above any conceivable or achievable
audio density.
IMPORTANT!
If your station is not required to comply with a Multiplex Power stan-
dard where it is licensed to operate, the BS412 control should remain unchecked!
Pilot Injection
The Pilot Injection control adjusts the level of the
19kHz stereo pilot and is adjustable from 0 (Off) to
20% of the main composite signal amplitude in 0.1%
steps.
Pilot Phase
Corrections to the 19kHz stereo pilot phase may
be made in 0.5 degree steps up to +/- 22.5 degrees.
The ability to vary the stereo pilot phase compared to
that of the 38kHz subcarrier allows the FM-531HD
to compensate for nonlinear time delays in the transmission system that would otherwise
disturb the phase relationships between the 19kHz stereo pilot and the 38kHz stereo sub-
carrier and cause degradation of stereo separation.
Stereo/Mono
The stereo encoder may be operated in Stereo or Mono by selecting the desired oper-
ating mode with this switch.
SCA 1 & 2 Gain
Inputs applied to the SCA connectors are digitized at 192kHz. Prior to being digitized
the signals are high pass filtered at 1kHz to reduce hum and then brick wall low-pass fil
-
tered at 94kHz. These controls can be set to OFF or to levels from -79.95dB to +10.0dB
in 0.05dB steps.
TX 1 Level
The TX 1 Level controls the output appearing on the BNC connector for TX 1. This
control can be set to OFF or to levels from -79.95dB to +6.00dB in 0.05dB steps. Refer-
ence is +2.40dB.
This control also adjusts modulation levels for the baseband192 digital multiplex
signal, noting that as of this writing transmitter manufacturers only support signals on
the TX-1 channel.
TX 2 Level
The TX 2 Level controls the output appearing on the BNC connector for TX 2. This
control can be set to OFF or to levels from -79.95dB to +6.00dB in 0.05dB steps. Refer-
ence is +2.40dB.
This control also adjusts modulation levels for the baseband192 digital multiplex
signal, noting that as of this writing transmitter manufacturers only support signals on
the TX-1 channel.
If TX 2 Pilot Only is checked, the TX 2 output becomes a 19kHz sine wave source.
Summary of Contents for FM-531 HD
Page 2: ...Technical Manual Wheatstone Corporation May 2013 FM HD Digital Audio Processor FM 531hd...
Page 122: ...page A 2 FM 531HD May 2013 A P P E N D I C E S Appendix A General Specifications A 3 Contents...
Page 128: ...page A 8 FM 531HD May 2013 A P P E N D I C E S Appendix B FM 531HD GPI Interface A 9 Contents...
