Crescend Technologies LLC P5XXUH1 Manual De Usuario

        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.

3.8. It is possible to significantly reduce the output power, pulling filter “SH/D” to the ground.  
        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.