Service manual

CIRCUIT DESCRIPTION
6-18
Month 2000
Part No. 001-2004-601
Pin 13 RX INJ
This pin is the power sense for the Receiver
injection. It is a linear voltage source that is a func
-
tion of the injection power. The voltage level will be
between 0V - 5V and be able to drive a 10k ohm load.
Pin 14 SYN LK RX
Pin 14 is the main synthesizer lock detector out-
put for the Receiver. The synthesizer is locked with a
TTL logic high state.
Pin 15 GROUND
Pin 15 carries ground current between the RFIB
and the Receiver board.
Pin 16 HS CS RX
Pin 16 is not used at this time.
Pin 17 GROUND
Pin 17 carries ground current between the RFIB
and the Receiver board.
Pin 18 RF CLK
The clock controls the Receiver synthesizers
when loading. The input source in the Controller is
TTL with the speed determined by the synthesizer
chip.
Pin 19 HS LK RX
Pin 19 is not used at this time.
Pin 20 RF DATA
Pin 20 is a data pin from the Controller which has
the dual role of loading the synthesizer chips and
adjusting the power control D/A lines for proper out
-
put power. The data has TTL levels. Up to four syn-
thesizer chips and a shift register could be connected
to this pin.