XYLENE POWER LTD.

POWER LINE CARRIER LIGHTING CONTROL

RESPONSE OF PLC RECEIVER

SYSTEL DATA FOR [Tr(F)]^2 AS A FUNCTION OF FREQUENCY F FOR PLC RECEIVER

F(kHz)---	Tr(F)---	[Tr(F)]^2---	Area
67	.01274	.000162	0
85	.01380	.000190	0
92	.06684	.004468	0
104	.2540	.064516	.414
109	.4466	.199452	.660
118	1.0116	1.023335	5.502
127	1.0	1.0	9.105
142	.6456	.416799	10.626
157	.2917	.085089	3.764
172	.0490	.002401	.656

The Integral{[Tm(F)]^2}dF is simply the area under the above curve.

Integral{[Tr(F)]^2}dF = 30.727 kHz

This measured bandpass is almost exactly Systel's stated design objective.

Recall that the RMS noise voltage Vnr seen by the PLC receiver input is given by:
[Vnr]^2=(Vb)^2Integral{[Tr(F)]^2}dF
or
[Vnr]^2= (Vb^2)(30.727 kHz)
or
Vnr= Vb(5.543) (kHz)^0.5

For a typical value of Vb = 4.04 mV / (kHz)^0.5,
Vnr = 4.04 X 5.543 = 22.4 mV

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This web page last updated September 20, 2005