3-40 Operation
G
AIN control is set to 0.0 dB and the AI REF VU control is set to 0.0 dBu, you will observe a gain of approximately –17
dB from the analog input to the analog output at 100 Hz. If the AO PRE-E control is set to PRE-E and the 5950 is
configured for 75µs preemphasis, the gain from analog input to analog output will be approximately 0 dB at 15
kHz.
While this calibration may seem unintuitive, experience has shown that it greatly reduces calls to Orban customer
service complaining that the frequency response of the transmission path is not flat when in fact the measurement
in question was causing undetected clipping at high frequencies due to preemphasis.
UTILITY
The UTILITY tab allows you to customize settings in the 5950 to adapt to your airchain and regulatory
requirements.
PROCESSING:
EXTERNAL AGC IN USE: If you are using an external AGC ahead of your STL, you will most likely want to select YES
as you don’t want dual AGC action, which will cause your audio to sound unnaturally dense. If you are not using an
external AGC, this should be set for NO.
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