Table of Contents
Advertisement
VHF
22.
ANTENNAS
23.
ALIGNMENT
23. I
The only alignment procedure required for the DAT AF LOW RTU control board is adjustment of the deviation.
produced by the RF board. Refer to the following procedure to properly perform this alignment.
RECOMMENDED TEST EQUIPMENT
I.
2.
PC compatible computer.
PREPARATION
I.
Connect the DATAFLOW RTU programming kit to the unit to be tested.
Configure theDATAFLOW RTUto transmit on channel 460 MHz for UHF systems, or 154 MHz for
2.
3.
Locate RBI on the control board. Ifa battery board covers the control board, Rl31 is located under
a hole in the battery board. The battery board does not need to be removed to access RI3 I.
DEVIATION ALIGNMENT
I.
Execute the DATAFLOW RTU transmitter test. This will cause the DATAFLOW RTU to transmit a
15-second test pattern. For instruction on the use of the programming software, see the DATAFLOW
Using an adjustment tool, adjust RI31 for a deviation of2.80 kHz to 3.00 kHz.
23.2
Refer to the applicable RITRON DTX manual for alignment of the RF board. When using the DTX manual in
support of the DATAFLOW RTU only the RF portion is valid. Disregard all references to the DTX control
board.
24.
THEORY OF OPERATION
24.1
The DATAFLOW RTU control board performs many functions. It is used to program and control the DTX RF
board. It is the real-world interface for the telemetry inputs and outputs. It communicates to devices over an RS-
485 serial link. The following paragraphs describe how individual blocks of the control board operate.
+5V REGULATOR:
24.1. l
voltage to +5VDC. The +5VDC value is set by resistors R!0l, RI02, and RI03 with FB = 2.50V (pin 13). This
IC also contains an output comparator used to monitor system + 5VDC voltage. This comparator shuts the
if low power is detected to prevent abnormal system operation due to low voltage.
24.1.2
VREG REGULA TOR:
voltage to +8.5VDC. The +8.5VDC value is set by resistors R!48 and R!49 with ADJ= 1.23V (pin 5). This IC
also contains an ENABLE pin (pin I) which allows the microprocessor to tum this regulator ON and OFF. With
5V applied to the ENABLE pin, the regulator is ON; with 0V applied to the ENABLE pin, the regulator is OFF.
4 Hz. INTERRUPT CLOCK:
24.1.3
functions as an interrupt timer to make the microprocessor read all the digital and analog inputs. The 4 Hz. rate
is made by dividing the 32768 Hz. crystal (YIOI). To save power, ICI02 is not run at full +5V. Diodes CRI03
and CRI04 are used to decrease the supply voltage to ICI02.
Normally, the deviation should not require realignment. This adjustment controls the amount of deviation
3.
BvI deviation meter.
system down
22.1
Section in process.
DATAFLOW RTU
DATAFLOW RTU
RTU
www.TwoWayRadioEquipment.com | (800) 878-7829 | Sales@TwoWayRadioEquipment.com
For instruction on the use of the programming software see the
programming kit.
Software/ Programmers Manual.
Software/Programmers Manual.
systems.
ICIOl is a DC-to-DC converter that changes the VUNREG input
IC112 is a DC-to-DC converter that changes the VUNREG input
IC102 provides a 4 Hz. clock to the microprocessor, which
( A-19)
DATAFLOW RTU
Advertisement
Table of Contents
