A80V/U is dual band power amplifier, primarily intended for use with dual band handheld FM transceivers.

Amplifier automatically recognizes transitting frequency and enables appropriate signal path. User can set output power level independently for VHFand UHF (built in ALC loop).

Transmit power amplifier and receiver preamplifier functions are independent on each other. They can be toggled on/off by pressing the respective push buttons: RX LNA andTX PA.

Once a function is enabled, the LED associated with the push button will light up. Amplifier is completely off when both LEDs are dark.

UHF bands. Preset power can beadjusted in 4 steps: 25W, 45W, 65W, 85W. The first pressing of the SET POWER button switches the amplifier into power setting mode. The display bar will blink , showing reset power level.

The first pressing of the SET POWER button does not change the power level, but displays the actual setting. Subsequent pressing of the SET POWER button changes the power setting. It will exit the power setting mode if the SET POWER button is not pressed again within 2 seconds.

To enable VSWR measurement, press SHOW SWR button while transmitting . This mode will last aslong as the amplifier is in transmit mode. The display will return to power measurement mode after releasing transceiver's PTT button.

The actual VSWR is represented by a single "moving dot”. The lowest reading is 1.20, below this value a respective LED will start blinking , indicating The highest reading is 1 .90 and with a reading past 2.00 a different respective LED willbegin to blink, signaling overrange.

To signal an error in amplifier's operation, the LEDs on the display bar will change their colour to red. Appearance of any error will deny the transmitting operation of the amplifier.

Error LED Meaning Amplifer reaction

• HIGH SWR Excessive VSWR over 2.1 Deny transmitting, resume after PTT release detected. Typically caused by a faulty antenna.
• OVERDRIVE Excessive input power Deny transmitting, resume after PTT release
• DC VOLTAGE DC supply voltage out of Deny transmitting, resume after PTT release and voltage restor ation permissible range
• HIGH TEMP chassis temperature too high Deny transmitting, resume after cooling down
• PA FAIL Amplifier electrical failure Deny transmitting, resume after PTT release