User's Manual

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P5XXUL1

Power Amplifier User’s Manual

1. General Information.

Power Amplifier (PA) is a AB/C-class unit. It is intended for amplification of single carrier phase (frequency)

modulated (manipulated) narrowband signals.

The working frequency range lays between 403 MHz and 450 MHz. 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 50 W.

Input VSWR is not greater than 1.8:1.

PA meets all FCC requirements to harmonic and spurious levels.

The nominal power supply voltage is 13.8VDC.

DC current consumption does not exceed 12.5A 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.

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.

There are two N connectors at the back of chassis.

There is power filtering DC connector at the back of chassis with two # 6-32 screws for “+” pole and for “-“ pole.

There are 3 filters at the back of chassis that bring alarming signal, as well signals for the outside power control.

The fan at the back side of unit performs the forced air cooling. Fan starts 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 fan.

2.2. Copper wires # 12 AWG shall be use in DC power line. Wires shall be crimp to ring

terminals.

3. Operation Guide

3.1. Power supply voltage shall be in the range 13.8 V + 1.0 V.

3.2. The input power inside the working frequency range shall be within the listed above limits.

It is prohibit applying any RF signal out of the working frequency range with a power, greater

than 10% of the minimum rated one.

3.3. Green LED “DC ON” is on, when DC voltage is applied to the unit.

3.4. Red LED “LOW POWER” is on, when the output power drops below 80% - 85% of set level. In majority of cases, it

warns about of inside problem. However, the output power may fail due to high load VSWR (in that case, LED tells

that the power decrease is stronger, then it is needed for VSWR protection).

3.5. Red LED “HIGH VSWR” is on, when the load VSWR exceeds 2.4 – 3. The output power is reduced.

3.6. Red LED “HIGH TEMP” is on, when the heatsink temperature is over +85˚C. Then the unit operates with output

power, reduced to about 75% of rated one. Fans are running continuously, no matter, is RF drive applied or not.

3.7. Voltage at filter “ALARM” is about 9.5V during the normal unit operation and drops to less than 0.5V, when any of

mentioned above red LED goes on. If 1.8 kOhm resistor is connected between this filter and the ground, TTL

compatible output is created.

Summary of content (4 pages)

PAGE 1
P5XXUL1 Power Amplifier User’s Manual 1. General Information. Power Amplifier (PA) is a AB/C-class unit. It is intended for amplification of single carrier phase (frequency) modulated (manipulated) narrowband signals. The working frequency range lays between 403 MHz and 450 MHz. Code “xx” shows the input power range: Code: Range, W: R1 0.1-0.2 R2 0.2-0.5 R5 0.5-1.0 1 1.0-2.0 2 2.0-5.0 5 5.0-10 10 10-20 20 20-50 In the normal operating mode the minimum output power is 50 W.
PAGE 2
3.8. It is possible to significantly reduce the output power, pulling filter “SH/D” to the ground (C5 units only). However, it is possible to change the output power smoothly by a trimmer resistor (50 kOhm is the recommended value of it), connected between this pin and the ground. 3.9. The output power drops to about 75% of rated level, if the filter “CTRL” is pulled to the ground (C5 units only).
PAGE 3
Federal Communication Commission Regulations The FCC rules require manufacturers to comply with the FCC RF energy exposure limits for communication devices before they can be marketed in the U.S. The FCC further requires users to be fully aware of and able to control their exposure to meet RF energy exposure limits. This document includes operating instructions and information required to control your RF exposure and to satisfy compliance requirements.
PAGE 4
3) In instances where the effective antenna gain (antenna gain – feedline loss) differs from the example above, the MPE radius must be calculated by the licensee. The table below presents the results of calculations of the MPE radius for a 50 Watt UHF transmitter having various effective antenna gain values. Effective Antenna Gain (dBi) 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 • Minimum Safe Distance (meters) 1.63 1.83 2.05 2.30 2.58 2.89 3.25 3.64 Minimum Safe Distance (feet) 5.34 5.99 6.72 7.54 8.46 9.49 10.