Power Line Carrier ____________________________________________________________________
RF-MCGARDPRO
Hubbell Power Systems, Inc.
–
RFL™
Products
July 1, 2022
©2022 Hubbell Incorporated
5-55
J6 & J7
jumpers
These are Phase Jumpers used in 100W applications, which set the
outputs of the two 50W amplifiers 180 deg out of phase. This will
insure that the total output power is additive. In 50W applications,
J6 and J7 can be set either way. In 100W applications, one 50W
amp must be set to “A” and the other 50W amp must be set to “B”.
As a standard, set the Main 50W amplifier to “A” and the Auxiliary
50W amplifier to “B” as shown below.
J6
J6
J7
J7
Setting "A"
Setting "B"
J8*
jumpers
For factory use only. Should always be set to position B.
J9*
jumpers
For factory use only. Determines if output disconnect relay is used.
For use with ON/OFF carrier set to B.
For all other applications set to A.
J10*
jumpers
For factory use only. Should always be set to Insert.
R8
potentiometer Sets the low input RF signal threshold at J4
R14
potentiometer Sets the idle current, which is the power that the power amp draws
from the power supply with no load and no input signal.
R69
potentiometer Balances the RF output signal.
R74
potentiometer Over current RF output adjustment.
R83
potentiometer RF output power level adjustment.
R163*
potentiometer For factory use only.
Note:
All jumper and potentiometer settings are made at the factory and should not need field
adjustment, except the gain potentiometer R83, and the threshold potentiometer R8.
For DIP Switch settings SW1 and SW2 see the following table. Set to ON to enable the DIP
Switch.
Table 5-22 Function of the DIP Switches SW1 and SW2 on the Power Amp Board
SW1
Phase Limit Setting:
The 50W Power Amplifier will shut down if a preset Phase Angle is
exceeded.
The factory set threshold is 60 degrees. SW1-1 through SW1-8 can be set
as follows: Note that SW1-2, SW1-4, SW1-5 and SW1-6 are not used.
DIP Switch
Phase Angle in Degrees
SW1-1
30
SW1-3
45
SW1-7
60 Default setting
SW1-8
90
