Olson Technology HLR3830 - Manual (Page 7)

025-370539 REV X1 Page 7
CHANNEL LOADING
The optimum RF input level for the RPT-323x is 31.0dBmV per channel if equipped with a standard loading of six
analog video channels. The chart below shows the change in RF input level according to the amount and type of
channel loading. The chart shows on the right what the RF input level is according to the -20dB test point. On the
left, the RF input in dBmV is shown. If loading with data channels only (QPSK, QAM) refer to the amount of total
bandwidth the data channels are consuming. 31.0dBmV per analog video channel is equivalent to -44.68dBmV/Hz.
The RPT-323x is setup in a way that allows for the same input level regardless of the laser type (DFB, FP,
CWDM).
When setting up the levels for the RPT-323x, use the RF input PAD in the node to adjust the -20dB input test point
on the transmitter for 31.0dBmV when loading with six analog video channels of 36MHz of digital loading. If
loading with a fewer number of channels, adjust the test point to the loading chart below. As an example, if loading
with two analog video channels (12MHz digital) then the test point would be set 16.33dBmV. If the node cannot
provide enough gain to do this, the RF input PAD on the transmitter can be changed out for a lower value.
However, the RF input test point will not reflect this change as it is after the test point. So if the node has a 0dB
PAD in it, and the transmitter RF input test point is showing 15dBmV, than the RF input PAD on the transmitter can
be lowered by 1.5dB to reach the 16.33dBmV needed for two channel loading. It should be noted that this PAD
has been changed for future reference.