Power Line Carrier
GARD 8000 SYS RFL Electronics
April 23, 2015 10-13 973.334.3100
10 Watts (+40 dBm) is measured at the output of the amplifier. The test page calibration is then done
to align the TX metering.
1. Verify that the TX filter, and Hybrid is jumpered for the appropriate configuration, and
terminate the output with a non-inductive nominal load.
2. Force the carrier on and to10W:
a. On test page, change the setting “Force Carrier” to “On”.
b. Then click on “Run Test”.
3. Verify 40dBm (10W) on “PA OUT” Red (+), Black (-) test points on the rear of the Analog
Module (see Figure 10-3). Adjust Amplifier Gain as needed.
4. Calibrate the TX Level:
a. On the test page, enable the checkbox for “Calibrate TX Level”.
b. Click on “Run Test”.
5. Verify the reading for TX level is 40dBm.
6. Return carrier to normal
a. On test page, change the setting “Force Carrier” to “normal”.
b. Then click on “Run Test”.
10.6 REFLECTED POWER METER CALIBRATION
This calibration procedure is used to digitally calibrate the Reflected Power circuits in the module.
Minor variations in component values are compensated for, giving a more accurate reading. There is
an analog adjustment which is done at the factory and should not be changed in the field unless the Tx
frequency is changed by more than 50 kHz. The digital calibration adjusts for component variations
and only needs to be done if the front (digital) or rear (analog) module is changed or if the transmit or
receive frequency is changed. The calibration consists of two parts where the DC offset error and gain
error is adjusted out.
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