Auto Coupling
Auto coupling of the attenuation links the attenuation to the reference level. That is, the
higher the reference level, the higher the attenuation. Auto coupling is indicated on the
display as
Atten XX dB.
Manual Coupling
When manually coupled, the attenuation can be adjusted independently of the reference
level. Manual attenuation coupling is indicated on the display as
Atten* XX dB.
IMPORTANT!
The attenuation should be adjusted such that the maximum signal amplitude at
the input mixer is –25 dBm or less. For example, if the reference level is +20
dBm, the attenuation should be 45 dB such that the input signal at the mixer is
–25 dBm (+20 – 45 = –25). This prevents signal compression.
Dynamic Attenuation
Dynamic attenuation tracks the input signal level, automatically adjusting the attenuation
and preamp to give the maximum dynamic range without compressing the input mixer.
Dynamic attenuation is indicated on the display as
Atten=Dynamic.
Setting the System Impedance
The RF In and RF Out ports both have 50W impedance. The Site Master can compensate
fora50W to 75W adapter on the RF In port.
Step 1.
Press the SYS key.
Step 2. Press the
Impedance soft key.
Step 3. If using the Anritsu 12N50-75B adapter, press the
75W Anritsu 12N50-75B soft
key.
Step 4. If using a different adapter, press the
Other Adapter Offset soft key and enter the
loss value using the numeric keypad or the Up/Down arrow key. Press the
ENTER key to set the loss value.
3-14
Chapter 3 Getting Started
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