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User Manual
Rev. 1.2 - 24/01/11
PTX-DDS
7.8.2 A.G.C. function for MPX channel
The A.G.C. of MPX input works in identical mode to audio input but with a value
range up to 6dB.
This control alters the level of SCA inputs of the same amount needed to correct
the signal present on MPX. Furthermore, the control occurs on the sum of MPX
and SCA.
7.8.3 Clipper function
The CLIPPER function cuts all signals above 0dB.
The Clipper on audio inputs is filtered to avoid compromising on pilot tone, RDS
signal, and any SCA.
The Clipper on MPX input is for security, it cuts the signals in surplus but does not
give any protection on pilot tone, RDS and SCA. The distortion of clipper is still
contained within the 100 KHz of bandwidth allocated to this input.
