User's Manual

3.4. Red LED “LOW POWER” is on when the output power drops below 80% - 85% of set level. In the majority of
cases, it warns about an internal problem. However, the output power may fail due to high load VSWR (in this
case, the LOW POWER LED tells that the power decrease is stronger than is needed for VSWR protection).
3.5. Red LED “HIGH VSWR” is on when the load VSWR exceeds 2.4 – 3.0. 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 an output
power reduced to about 75% of rated.
3.7. Voltage at filter “ALARM” is approximately 9.5V during normal operation and drops to less than 0.5V when any of
above mentioned red LEDs turns on. If a 1.8 kOhm resistor is connected between this filter and the ground, a TTL
compatible output is created.
3.8. It is possible to significantly reduce the output power by pulling feedthrough pin “SH/D” to the ground.
However, it is possible to change the output power smoothly by a trimmer resistor (50 kOhm
is
recommended), connected between this pin and ground.
3.9. The output power drops to about 75% of rated level, if the filter “CTRL” is pulled to the ground.
3.10. In fan operation test, fans are running during the first 3 seconds after the moment that DC voltage is applied to the
unit. Fans start rotating when an RF signal is applied at the input, with delay of 3 sec and stops rotating 8 sec after
switching RF off. In the case of unit overheating fans are running continuously, no matter, is RF signal applied or
not.
• Notice: The manufacturer’s rated output power of this equipment (see Table 3-1) is specified for single carrier
operation using constant-envelope modulation. This equipment is NOT designed for multiple-carrier
operation, nor is it intended to be used with non-constant envelope modulation types.
Table 3-1. Amplifier Specifications
Specification Value
Instantaneous Bandwidth 136-174 MHz
Output Power
250 W
Input Impedance
50 Ohms
Output Impedance 50 Ohms
Table 3-2. Amplifier Input Power Ranges
Input Power Designator Code Input Power Range Nominal Gain (250W Output)
R1 0.1-0.2 W 34.0 dB
R2 0.2-0.5 W 31.0 dB
R5
0.5-1 W
27.0 dB
1 1-2 W 24.0 dB
2 2-5 W 21.0 dB
5 5-10 W 17.0 dB
10 10-20 W 14.0 dB
20 20-50 W 11.0 dB
4.0 RF ENERGY EXPOSURE AWARENESS, CONTROL INFORMATION, and OPERATIONAL INSTRUCTIONS for
COMPLIANCE with FCC RF EXPOSURE LIMITS
NOTICE: This power amplifier product is intended for use in environments in which personnel have full
knowledge of their exposure and can exercise control over their exposure to meet FCC limits. This power
amplifier is NOT authorized for use by the general population, consumer, or for use under conditions where
unintended or accidental exposure may occur.
This power amplifier product generates electromagnetic energy in the radio frequency (RF) spectrum to provide
communications between users over a distance. RF energy is one specific form of electromagnetic energy. Other forms
include, but are not limited to, sunlight and x-rays. RF energy, however, should not be confused with these other forms of
electromagnetic energy, which when used improperly, can cause biological damage. Very high levels of x-rays, for
example, can damage tissue
s and genetic material.