Mechanics & Electronics ME500-H Operating Manual page 4

1.5 The PA is constructed with the following protection circuits and useful features:
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- Heat up time checking circuit (3 min)
Protection circuits (Ia, Ig1, temp, SWR>3,overdrive)
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- Temperature dependent ventilating speed control
- Cooling fans (2 pcs)
- Function and status indicator LEDs (6 pcs)
- OPTO coupled PTT switch
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4 LED bargraph in new front page version (FWD, RFL, Ig1,
Ia,Ua,tmp)
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Built in PS and RF relays