EB500 Power Amplifier Protection Circuits
1. Overheat protection.
If the temperature of the transistor case exceeds + 70 ° C, the bimetallic thermal switch
located on the transistor case will be triggered and transmission becomes impossible, until
it cools down to + 65 ° C.
2. Protection against exceeding the maximum permissible output power.
If the output power level exceeds the permissible threshold, a protection will be activated
that disconnects the power from the output transistors. The P LED lights up on the front
panel. A power cycle is required to reset the protection.
3. Protection against high SWR.
If the SWR in the load exceeds the value of 1.5: 1, then the protection system will trigger.
The SWR LED on the front panel lights up. To reset the protection, turn off the power. In
case of protection operation, we recommend checking the SWR antenna and feed line.
Insure feed line and connectors are adequate for handling 500 watts
4. Protection against exceeding the maximum permissible current.
If the current value of the output transistors exceeds the permissible threshold, a
protection will be activated that disconnects the power from the output transistors. The
LED I on the front panel lights up. To reset the protection, turn off the power.
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