Glenayre Electronics Inc. GL-T8600-CN Manual Do Utilizador
DSP Exciter
Glenayre Document Number: 9110.00172
OPTIONS
Issue 1, Rev. I: 01/15/97
Page: 10-6
Copyright © 1997 Glenayre
Print Date: 02/19/97
converts the analog into serial data, which is applied to the DSP through a synchronous data
link. A synchronous data link is characterized by an exchange of pulse streams for timing
purposes. The A/D converter is clocked by a pulse generator circuit driven by the exciter’s
ten-MHz reference circuit.
link. A synchronous data link is characterized by an exchange of pulse streams for timing
purposes. The A/D converter is clocked by a pulse generator circuit driven by the exciter’s
ten-MHz reference circuit.
10.2.3.2 FSK-Data-Bit Strapping
The exciter DSP modulator circuit can read up to four bits for its digital FSK mode input
signal, but the controller provides two active bits 1 and 2 (DATA1, DATA2). This allows
transmitter operation in the two-level or four-level mode.
signal, but the controller provides two active bits 1 and 2 (DATA1, DATA2). This allows
transmitter operation in the two-level or four-level mode.
10.2.3.3 Channel-Select-Bit Strapping
The exciter MCU control circuit reads three bits to determine the remotely selected
channel, and the transmitter controller provides bits 1, 2, and 3 (CH SEL 1,2,3). As a result,
the transmitter controller can command all eight of the possible channels.
channel, and the transmitter controller provides bits 1, 2, and 3 (CH SEL 1,2,3). As a result,
the transmitter controller can command all eight of the possible channels.
, defines the transmitter operating channel
resulting from the channel select inputs.
10.2.3.4 Mode-Select-Bit Strapping
The exciter MCU control circuit reads two bits to determine the remotely selected mode,
but the transmitter controller provides only bit 1 (MODE CONTROL). As a result, the
transmitter controller can command three of the transmitter’s four possible modes.
but the transmitter controller provides only bit 1 (MODE CONTROL). As a result, the
transmitter controller can command three of the transmitter’s four possible modes.
, defines the transmitter operating
mode resulting from the model select input.
10.2.3.5 Power Sample D/A Conversion
The transmitter controller reads two 0-to-2.5-volt voltages for its forward and reflected
power sample inputs, but these power values are stored as data within the exciter’s MCU
control circuit. The controller interface converts the data to voltages of the appropriate
range for the transmitter controller. Data from the MCU representing the forward and
reflected powers is written into a dual D/A converter. The D/A converts the data into two
proportional dc voltages ranging from 0 volt to 2.5 volts (FWD PWR SAMPLE, REF PWR
SAMPLE), which are applied to the transmitter controller. Control logic gates ensure that
data is written to the proper half of the D/A converter.
power sample inputs, but these power values are stored as data within the exciter’s MCU
control circuit. The controller interface converts the data to voltages of the appropriate
range for the transmitter controller. Data from the MCU representing the forward and
reflected powers is written into a dual D/A converter. The D/A converts the data into two
proportional dc voltages ranging from 0 volt to 2.5 volts (FWD PWR SAMPLE, REF PWR
SAMPLE), which are applied to the transmitter controller. Control logic gates ensure that
data is written to the proper half of the D/A converter.