5-1
Chapter 5
Schematic Diagrams, Overlays, and Parts Lists
5.1
Introduction
This chapter provides schematic diagrams, overlays, and parts lists for the radio circuit boards and
interface connections.
5.1.1
Notes For All Schematics and Circuit Boards
* Component is frequency sensitive. Refer to the Electrical Parts List for value and usage.
1.
Unless otherwise stated, resistances are in Ohms (k = 1000), and capacitances are in picofarads
(pF) or microfarads (µF).
2.
DC voltages are measured from point indicated to chassis ground using a Motorola DC multime-
ter or equivalent. Transmitter measurements should be made with a 1.2 µH choke in series with
the voltage probe to prevent circuit loading.
3.
Reference Designators are assigned in the following manner:
4. Interconnect Tie Point Legend:
CLK = Clock
CSX = Chip Select Line
M or SWB+ = Switched Battery Voltage (7.5V)
R5 = Receive Mode 5 V
SYN = Synthesizer
T5 = Transmit Mode 5V
UNSWB+ = Unswitched Battery Voltage (7.5V)
Vdda = Regulated 3.3 Volts (for analog)
Vddd = Regulated 3.3 Volts (for digital)
VSF = Super Filtered (4.5 V)
Circuit Block
Series (200 MHz)
Series (700 MHz)
Receiver Front End
3300
300
Receiver I-F
3100-3200
350
Frequency Sysnthesizer
3700
200
VCO's
3800
600
Transmitter and Power Control
3500
100
Microprocessor
400
400
Memory
400
400
RX Audio Opamp Gain Stage
600, 2000
850
ASFIC
400
400
Audio Power Amplifier
400
400
Controls and Indicators
500
500
Keypad/PassPort Board Interface
400, 4000
400, 500
Keypoad/PassPort Option Board
600
600
Содержание HT1250-LS+
Страница 10: ...viii ...
Страница 12: ...x Product Safety and RF Exposure Compliance ...
Страница 16: ...1 4 Introduction ...
Страница 58: ...4 22 Maintenance ...
Страница 64: ...5 6 Schematic Diagrams Overlays and Parts Lists ...
Страница 102: ...5 44 Schematic Diagrams Overlays and Parts Lists Figure 5 34 Keypad PassPort Option Board Schematic Diagram ...