Configuration
Table 5-15. Function of jumpers, connectors and potentiometers on Power Amp.
Reference
Designation
Component Function
DS1
LED (green)
This LED is located on the front left panel of the Power Amplifier. The LED is lit when
the Power Amplifier is transmitting.
J1
connector
Provides input dc voltage from power supply, +92Vdc and +30Vdc.
J2
connector
Power output to Tx Filter Module.
J3
connector
Power amplifier failure alarm output signal. Signal goes to alarm relay on balance
board, which provides form-C contacts on back of RF chassis. Output is +12Vdc when
power amp fails.
J4
connector
Tx In (RF input signal from back of MA-650)
J5
connector
Spare Tx In (not used)
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.
RFL 9508D UCC
RFL Electronics Inc.
J6 J7
Setting “A”
J6 J7
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.
* Effective October 2010
May 27, 2011
5-30
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