Codan Radio Communications AMP-2-450 User Manual

UHF AMP-2 30 W Power Ampliﬁer Instruction Manual

IM71-AMP2450-30

Installation and Site Operation

Power Indicator - indicates +13.8 Vdc is applied to the transmitter when the ON-OFF

switch is activated. An internal connector on the RF Sensor PCB disables the power

indicator LED in the event that standby LED current drain must be eliminated.

TX Indicator - indicates that a preset forward RF power level is present at the transmitter

output. The threshold level is internally adjustable for various RF output levels over the

20-30 watt range.

Over Temperature Indicator - (O/T) a thermostat control switch interrupts the input supply

voltage (nominally +13.8 Vdc) to the power ampliﬁer when the heat sink temperature

exceeds 175˚F (80˚C). The over temp thermostat will reset at 145˚F (63˚C), thus

providing hysterisis. The Over Temperature indicator is only operational when exciter

drive is present.

VSWR Indicator - Normally set up at the factory. This indicator is internally set on the RF

Sensor PCB for a 50 ohm resistive match. When appreciable reverse power is sensed

(high VSWR), the VSWR indicator LED turns on. The reverse power threshold for this

indicator is internally adjustable as required.

The fan is activated when the UHF power ampliﬁer output heat sink temperature reaches +40˚C. The

fan’s operating temperature range is -20˚C to +60˚C. The fan sensor will not activate the fan when the

ambient temperature is below -20˚C.