User Instructions

Tune – up Instructions
Document
WERA4-Tune-up-Instruction-200919
Page 4 of 4
As a first step the output power need to be adjusted to a minimum, that means the
PA gain should be set to 20 dB. Click on “Submit” and “save + close” to active the
setting and return to the initial window (fig. 2).
- Now run a short calibration measurement (80 Hz frequency offset).
- Click on “check system now” to get the power amplifier output power reading.
- Check the results using “Plott_WERA_Cal_lsq” according to the description of
chapter 11.7 of the Quick Installation Guide.
- All “rms voltages” are expected to be below 7 Volts
- Increase the gain by one step using the PA setting window and run a calibration
again.
Attention: Always check the output power value to ensure that the
level is kept below the calculated max PA output power limit.
- If no antenna has reached the 7 volts limit the gain (=power) can be increased by
one step again.
The optimum is reached as soon as one Rx antenna
voltages reaches a value close to the 7 Volts limit.
- If this optimum output power is more than 4 dB lower as the calculated max PA
output power, the receiver sensitivity can be reduced, please refer to chapter 7.1.5
of the Quick Installation Guide.
- After increasing the “Receiver Attenuation” by 4 dB the power can be increased by
another step and the output power and the rms voltages should be checked again.
This procedure can be repeated until the Receiver Attenuation reached a
value of 12 dB.
Attention: Always check that at the PA no red LED is on.
In that case reset the PA before the next calibration cycle is started.