User's Manual

05-4186A01-eNETL2TUV_Manual_RevD.doc
05-4186A01 Rev. D Page 6 of 7 2/17/2015
4 Installation
4.1 Mounting the Unit
The eNETL2T and eNETL2V are designed for mounting in a standard 19–inch rack cabinet using the 3U
panel provided. Four screws (not provided) are required to attach the panel to the rack sides. This
panel also serves as a heat sink for the PA module, and is normally mounted with the cooling fins
facing outward.
4.2 Connecting the Unit
Place the amplifier module in service by making the following cable connections.
1. Using low loss 50-ohm coaxial cable, connect the RF Input connector (J103) to the RF output
connector of the MDS 220 MHz radio.
2. Using low loss 50-ohm coaxial cable, connect the RF Output connector (J102) to the station
duplexer or antenna.
3. For use with TD220 or other 220 MHz radios without a control interface, follow these sub-
steps:
a. Move Jumper J104 to the Internal Keying position as shown in Figure 2 and leave
J101 open. Access to J104 is available through a top cover vent slot.
4. For use with entraNET 220, follow these sub-steps:
a. Move Jumper J104 to the External Keying position as shown in Figure 2. Access to
J104 is available through a top cover vent slot.
b. Connect the Power Control interface (J101) to the MDS 220 MHz radio in accordance
with the pin connections listed in below. J101 is an 8-pin Molex polarized connector.
5. Connect 10-16 Vdc power supply to the Power connector (J100). The left pin is positive (+); the
right is negative(–).
This completes the installation procedure. The remainder of this guide provides steps for power output
check/adjustment, lists specification data, and agency approval information.
Adjusting RF Power Output
To check/set the amplifier’s RF power output, proceed as follows.
1. Connect a wattmeter (rated for use at 220 MHz, and at least 40 watts) to the amplifier’s RF
output connector (J102).
2. Terminate the wattmeter into a 50-ohm, non-inductive load.
3. Apply RF drive from 220 MHz radio and note the RF power indication at J102.
4. If necessary, adjust R112 (see Figure 2) with an insulated flat blade tool to achieve the desired
output level. Access to this control is available through a top cover vent slot.