... -E(L)-PD is dual module power doubler unidirectional trunk amplifier 2.The maxium frequency optional 550MHz, 750MHz, 860MH 1. ... (L)-PD is dual module power doubler unidirectional trunk amplifier 2.◊◊ represent the amplifier gain, maximum optional 26dB,28dB,32dB3. The maxium ... . 0-20dB adjustble attenuator and 0-20dB ajustable equalizer5.Quality switching power supply, the range from 35-90V or 110-265V6 ...