3 psd setting 54, Psd setting, Figure 33 psd setting – Motorola Canopy Powerline MU User Manual
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Powerline MU
Page 54 of 112
6.5.3 PSD Setting
Figure 34 PSD Setting
The PSD (Power Spectral Density) setting screen provides a place for the end user to
adjust power levels for each Powerline subcarrier. The factory default is 128. Each
subcarrier can be raised or lowered in small steps from 255 down to a value of 0, which
will turn it off.
At a PSD value of 128, the power output of the device is about 22dBm, or -50dBm/Hz.
Lowering the values of the PSD setting will lower the power output of the Gateway and/or
Modem and correspondingly will decrease the distance at which the devices will be able
to communicate. Raising the PSD value increases power output, but if it is raised above
approximately 169, noise will start to degrade the signal. When using the Fixed Value
check box to set all PSD values. The maximum practical value that can be configured is
169. However, setting the PSD value to 169 or higher can cause intermittent behavior
and it is recommended that you use the default value and stay well below 169. If you
wish to change each value, you must do so individually.
The PSD page is designed to allow the system operator to respond quickly to any radio
frequency complaint and adjust Powerline carriers accordingly.
Grayed out values are reserved amateur operator radio frequencies and cannot be
adjusted.
Select Apply.
Powerline MU Carriers Linked to Carrier Frequency.
The following chart links carrier frequency to a carrier channel. If you receive a complaint
from an amateur radio operator that your Powerline MU system is causing interference,
you must work with that person to find out on what frequency the interference exists.
When you have determined the offending frequency, find it on the chart and turn down
the related PSD setting until the interference no longer exists.
The device passes United States FCC testing at PSD settings 128 and lower. Do not
exceed a PSD setting of 60 to be compliant with European regulations. In other regions,
the recommended settings may be different.