Rfds Preselector (Vhf); Rfds - Transmit Filter (700/800 Mhz); Figure 17: Preselector (Uhf); Figure 18: Preselector (Vhf) - Motorola ASTRO 25 GTR 8000 Manual

MN003286A01-E
Chapter 2: GTR 8000 Base Radio Theory of Operation

Figure 17: Preselector (UHF)

2.3.3

RFDS Preselector (VHF)

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 not required when using a receiver multicoupler system. This filter can be retuned in
the field.

Figure 18: Preselector (VHF)

2.3.4

RFDS - Transmit Filter (700/800 MHz)

The transmit filter removes any noise in the receive sub-band. The Tx Output from the GTR 8000 Base
Radio connects to the Transmit Filters Tx In. The Transmit Filters Tx Out connects the Tx Output or
any other RFDS equipment.
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