Backplanes And Card Cages; Rfds Modules; Rfds - Preselector (700/800 Mhz); Rfds - Preselector (Uhf) - Motorola GTR 8000 Manual

GTR 8000 Base Radio

2.2 Backplanes and Card Cages

Card cages for the GTR 8000 Base Radio are created with a welded and riveted design. Each card cage has a
backplane.
• See 3.4.5 Connections – Rear (Integrated Voice and Data), page 3-23
page 3-26.

2.3 RFDS Modules

The Radio Frequency Distribution System (RFDS) equipment included in your system depends on what options were
purchased from Motorola. The following lists some examples of the RFDS equipment available for your system.

2.3.1 RFDS - Preselector (700/800 MHz)

Figure 2-12 Preselector Filter (700/800 MHz)

The preselector provides a first level of band pass filtering for inbound RF signals. RF input and output connectors
are cabled to the GTR 8000 Base Radios RF Output RxA. This filter must be included to fulfill TIA102-CAAB
Class A spurious response rejection (90 dB). The filter is usually not required when using a receiver multicoupler
system. This filter can NOT be retuned in the field.

2.3.2 RFDS - Preselector (UHF)

The preselector rejects unwanted signals including the transmitter signals from overloading the receiver. This filter
must be included to fulfill TIA102-CAAB Class A spurious response rejection (90 dB). The filter is usually not
required when using a receiver multicoupler system. This filter can be retuned in the field.
2-12
and 3.4.6 Connections – Rear (HPD),
6871022P86-A - November 2012