MDS LEDR 1400F, Installation & Operation Manual

Page: 128 / 154

120 LEDR Series I/O Guide MDS 05-3627A01, Rev. D
15.0 INCREASE BANDWIDTH BY
CHANGING TRANSMITTER AND
RECEIVER FILTERS
15.1 Introduction
It is possible for qualified service personnel to upgrade LEDR Series
radios in the field to increase the radios RF bandwidth. Listed in
Table
31 are five upgrade kits. Each kit consists of three RF filters; one is used
in the transmitter section and two are used in the receiver section. In
addition, there is a unique software key that will allow the data circuitry
to handle the higher data bandwidth. This key is based on the radio’s
serial number and can only be used with that radio.
Each kit consists of a set of 3 filters (transmitter 1; receiver 2), software
activation key and instructions for converting radio’s occupied band-
width. The radio serial number must be provided to the factory for issue
of authorization key.
To realize the full benefit of the increased RF bandwidth, it may be nec-
essary to upgrade the radio’s data interface.
Table 1 on Page 1 provides
a simplified listing of radio bandwidth and compatible data interfaces.
15.2 Filter Removal and Replacement
These instructions describe the removal and replacement of filter mod-
ules inside a LEDR Transceiver, as well as the software commands nec-
essary to authorize the new bandwidth.
CAUTION:
This upgrade involves the removal of small, delicate parts.
It must be performed by experienced personnel only, using
proper tools and equipment to preserve the factory warranty.
Precautions must be taken to prevent damage to components
due to static discharge and other risks.
1. Remove the radio from service and disconnect all cabling from the
rear panel.
Table 31. Hardware Upgrade Kits for Increased RF Bandwidth
For Subrate Radios For Fullrate Radio
25 kHz to 50 kHz 500 kHz to 1.0 MHz
25 kHz to 100 kHz 500 kHz to 2.0 MHz
25 kHz to 200 kHz 1.0 MHz to 2.0 MHz
50 kHz to 100 kHz
50 kHz to 200 kHz
100 kHz to 200 kHz