Crescend Technologies LLC P8XXL1 Manuale Utente
P8XXJK1 and P8XXL1
Power Amplifier User’s Manual
1. General Information.
Power Amplifier (PA) is the C-class unit. It is intended for amplification of single carrier phase
(frequency) modulated (manipulated) narrowband signals.
Working frequency range lies between 764 MHz and 870 MHz for JK unit (P8XXJK1) and
between 890 MHz and 942 MHz for LW unit (P8XXL1). Code “xx” shows the input power range:
Code: R1 R2 R5 1 2 5 10 20
Range, W: 0.1-0.2 0.2-0.5 0.5-1.0 1.0-2.0 2.0-5.0 5.0-10 10-20 20-50
In the normal operating mode the minimum output power is 80 W for JK and 80 W for L unit.
Input VSWR is not greater than 1.7:1.
PA meets all FCC requirements to harmonic and spurious levels.
Input VSWR is not greater than 1.7:1.
PA meets all FCC requirements to harmonic and spurious levels.
The nominal power supply voltage is 13.8VDC.
DC current consumption does not exceed 24A at 13.8V
Working ambient temperature range lies from -30ºC to +60ºC.
DC current consumption does not exceed 24A at 13.8V
Working ambient temperature range lies from -30ºC to +60ºC.
Input and output power levels are set up in the factory. Customer has an opportunity to reduce
the output power, adjusting the special trimmer resistor in the unit, or picking up the value of outer
resistor, connected to PA control pin.
PA has automatic power control loop that provides the stability of output power during the
normal operation and all necessary changes of power in the case of load mismatch or unit
overheating.
the output power, adjusting the special trimmer resistor in the unit, or picking up the value of outer
resistor, connected to PA control pin.
PA has automatic power control loop that provides the stability of output power during the
normal operation and all necessary changes of power in the case of load mismatch or unit
overheating.
PA is intended for rack mounting in the standard 19” cabinet. The front panel is 7” high. The
deepness of unit does not exceed 5”.
Four LED at the front panel indicate the status of unit operation.
The hole in the side wall gives an access to the trimmer resistor, which allows reducing the
output power against the set value.
Four LED at the front panel indicate the status of unit operation.
The hole in the side wall gives an access to the trimmer resistor, which allows reducing the
output power against the set value.
There are two N connectors at the back of chassis.
There is power filtering DC connector at the back of chassis with # 6-32 screws.
There are 3 filters at the back of chassis that bring alarming signal, as well signals for the
outside power control.
Two fans at the back side of unit perform the forced air cooling. Fans start rotating, when RF
signal comes to the unit input.
There are 3 filters at the back of chassis that bring alarming signal, as well signals for the
outside power control.
Two fans at the back side of unit perform the forced air cooling. Fans start rotating, when RF
signal comes to the unit input.
2. Installation Guide.
2.1. Unit installation shall provide a proper air access to the unit; no obstacle for air is allowed
closer than 3” from fans.
2.2. Copper wires # 10 AWG shall be use in DC power line. Wires shall be crimped to ring
terminals.
terminals.