Junger Audio D*AP4 FLX / D*AP4 LM Edition - Manual (Page 56)

D*AP4
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The important step in calibration is to set up the Operating Level. A stationary sine signal at this level
must cause a FM carrier deviation of ±40 kHz. If the input level (at FM HPA or uplink line) for this
reference modulation is known, just set the Operating Level in the FM Conditioner accordingly.
In most installations this will be the case.
In a lot of stations +6 dBu (analog) or -9 dBFS (digital) for a 500 Hz tone is reference level. It may be
designated as the operating level and defined at 0 dB relative (displayed on a peak level meter). Please
be careful with this type of reference level scale, as this analog operating level of 0dBr is not the same
as 0 dBr MPX power!
If the reference modulation is unknown, a sine test tone needs to be applied and the frequency
deviation of the FM carrier needs to be measured over the air. Start with a generator level of -9 dBFS
and change this value until ±40 kHz deviation is attained. Please note that any Junger Audio unit in the
chain between generator and FM HPA needs to be bypassed first. Calibration is performed without any
processing, additional service or pilot signal considered!
If the Reference Level of your setup differs from -9 dBFS the Setup Gain of the FM Conditioner can be
used for level matching.