Technical Manual

Preliminary Release

2.0 Radio Configuration and Operational Check

2.1 General Discussion

Prior to customer installation and electrical connection of the customer’s terminal equipment

to the 2788 radio, it is recommended that the installing technician conduct a brief operational

checkout of the 2788 radio and confirm that all operating parameters are set as desired.

This initial checkout and possible reprogramming/customization is generally performed on the

maintenance shop test bench before the radio is installed and commissioned in a link

application.

The following parts of this section provide guidance in this checkout process and illustrate

alternate configurations and paths to perform the initial checkout.

2.2 Operational Bench Test

To ensure that the 2788 radio is functional prior to installation at the desired site, it is highly

recommended that the following tests be performed in sequence: (Please refer to 2.2.3 Initial

Checkout.)

2.2.1 Antenna Connector

The 2788 radio antenna port (RF Connector) is a coaxial, female, Type N connector. This

connector mates with a male cable connector, Type N such as Amphenol 3900, Andrew L44N,

or MIL Type UG-21. Under most circumstances, bench tests are conducted with a service

monitor (manufactured by IFR Inc., Marconi Instruments Ltd., Hewlett-Packard, Motorola, etc.).

CAUTION

The transmitter should not be keyed on or placed in the transmit

mode without a load connected to the antenna port to prevent

damage to the 2788 radio Power Amplifier due to long periods

(more than 10 minutes) of severely high SWR. An antenna, service

monitor, or dummy load should be attached to the antenna port.

The 2788 radio power output is approximately 2 Watts maximum,

so if a service monitor is connected to the antenna port, ensure

that the service monitor’s input port can handle at least a 5 watt

input to avoid damaging the service monitor.