User's Manual

05-4186A01-eNETL2TUV_Manual_RevD.doc
05-4186A01 Rev. D Page 4 of 7 2/17/2015
2 Introduction
The eNETL2T/U/V is an RF power amplifier designed for use in the 210–270 MHz frequency range at up
to 40 Watts. It is intended to serve as a 100% duty cycle amplifier for MDS entraNET 220 and
TD220 radios operating in point-to-multipoint repeater or base applications.
2.1 Product Description
The eNETL2T/U/V power amplifier consists of an RF amplifier and PCB mounted to a heat sink, with a
DC Power interface, power control interface, and input/output RF connections on the sidewalls of the
chassis. DC power is supplied to the amplifier from a regulated and filtered DC source capable of
supplying 10-16 Vdc at a maximum current of 6 Amperes. The DC power source should be current
limited or have a protective fuse or circuit breaker.
2.2 Power Control Loop Modes
The amplifier can operate in two modes; External or Internal Control Loop. In External mode, a cable
feeds the output power level back to the transceiver (typically an entraNET 220) which adjusts its drive
to attain the power setpoint. In Internal mode, a feedback circuit within the amplifier performs
this function. In both cases, the setpoint is set by potentiometer R112, located within the amplifier.
Further, the PA performs TX/RX switching to provide a low loss receive path when not transmitting. The
TX/RX control is performed via the control cable attached at J101 and by RF detection within the PA.
Figure 1 – J104 and R112 Locations