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.
MN003286A01-E
Chapter 2: GTR 8000 Base Radio Theory of Operation
72