User's Manual

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 (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).