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HP 9800 AUDIO/LOGIC DESCRIPTION (ALL MODELS), Figure 3-3Audio and Data Processing Circuitry Block Diagram

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CIRCUIT DESCRIPTION

AUDIO/LOGIC DESCRIPTION (ALL MODELS)

Rx Audio Gate Control

From

Supervisory Tones

RECEIVE AUDIO

Bandpass Filter/

Logic

Q301

Summing

Amplifier

De-Emphasis

Audio

Speaker

300-3000 Hz

U307C

Amplifier

Amplifier

From

Rx Audio/Data

U301C,

U301A

U306

Receiver

U301B

U301D

Rx Audio

8V

From

Gain Adjust

U307B

Gate

Front Panel

Digital Volume

Logic

Q302

Control

RECEIVE DATA

Volume Control

U309

(98x1)

(9842)

Low-Pass Filter

Data

Audio Mute Control

< 140/211 Hz

Detector

From Logic

U300B,

U300D,

Digital Receive Data

To Logic

U300C

U300A

Filter Bandwidth Control

From Logic

Q300

Comparator

SQUELCH

Bandpass Filter

U304A

U304B

Squelch Signal

To Logic

From

Serial Data

Digital

U305

Squelch

Logic

Control

TRANSMIT AUDIO

Microphone

High Pass Filter

Mic Audio

Amplifier

Pre-Emphasis/

Splatter Filter

Microphone

Amplifier

> 300 Hz

Gate

Limiter

> 3 kHz

Tx

U303B

U303C

U303D

U303A

U302B,

Audio

To Synthesizer

U302C

From

Mic Audio Gate Control

Q307

U308B

Logic

Low Pass Filter

Tx

Data

TRANSMIT DATA < 140/211 Hz

Gate

Data

Analog Transmit Data

From

U304A

To Synthesizer

Logic

From

Tx Audio Gate Control

Logic

Figure 3-3 Audio and Data Processing Circuitry Block Diagram

Pin 5 is the input of an internal gain control stage. Gain increases in proportion to increases in the DC voltage on this pin. With the low tier models, volume control is provided by a D/A converter formed by shift register U309 and several resistors. The six-bit output controls the volume in 64 steps. U309 is programmed by the SPI bus described in Section 3.3.1. With the mid and high tier models, the front panel volume control is part of a voltage divider which includes R356 and R426.

If the voltage on pin 5 falls below approximately 0.4 volt DC, the output is muted. Speaker muting is

controlled by the Q7 output (pin 12) of latch U110. When this output goes high, inverter/level translator Q302 turns on which grounds the volume control input of U306 and mutes the speaker.

3.4.3 RECEIVE DATA PROCESSING

The receive audio/data signal from amplifier U301B is applied to a low-pass filter formed by U300B and U300C. This filter attenuates voice and harmonic frequencies occurring above the data band.

	February 2001
3-8	Part No. 001-9800-001

Contents

25 or 40 Watts (UHF); 15 or 30 Watts (800/900 MHz) 13.6 VDC Part No 13.6 VDC 25 or 40 Watts, UHF 15 or 30 Watts, 800/900 MHz Part No. 242-984x-2xx(UHF) Part No. 242-988x-2xx(800 MHz) TABLE OF CONTENTS 1 GENERAL INFORMATION 3 CIRCUIT DESCRIPTION 2 INSTALLATION TABLE OF CONTENTS (CONT’D) 4 SERVICING 5 PARTS LIST 6SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS LIST OF TABLES LIST OF FIGURES SECTION 1 GENERAL INFORMATION 1.3 PART NUMBER BREAKDOWN Table 1-1Part Number Breakdown 1.4 TRANSCEIVER IDENTIFICATION Table 1-2Identification Number Breakdown Type 1.5 ACCESSORIES Table 1-398xx Accessories Accessory Cable Data/Accessory Cable Desktop Accessories 1.6 PRODUCT WARRANTY 1.7 FACTORY CUSTOMER SERVICE 1.8 FACTORY RETURNS 1.9 REPLACEMENT PARTS 1.10 INTERNET HOME PAGE UHF 984x SPECIFICATIONS 800 MHz 988x SPECIFICATIONS 900 MHz 989x SPECIFICATIONS SECTION 2 INSTALLATION 2.2 MOUNTING THE TRANSCEIVER WARNING Item Figure 2-2Remote Mount Installation Components 2.3 POWER CABLE INSTALLATION Figure 2-3Accessory Cable Installation 2.4 ACCESSORY CABLE INSTALLATION Function Figure 2-4Accessory Cable Connector Figure 2-5R170 Location Diagram Sw Bat Out (pin 2) Horn Alert (pin 4) - See Section Ignition Sense (pin 6) - See Section Output D (pin 7) 2.5 REMOTE CONTROL UNIT INSTALLATION Figure 2-6Data Cable Installation (-001Cable Shown) 2.6 USING AN EXTERNAL SPEAKER 2.7 DATA CABLE INSTALLATION CAUTION Table 2-1Data Cable Wire Chart J301 Pin No Wire Color 2.8 KEY CAP KITS EMER F1 F2 F3 SCAN SCAN BKLHT MSG HORN SECTION 3 CIRCUIT DESCRIPTION POWER DISTRIBUTION (ALL MODELS) 3.2 POWER DISTRIBUTION AND SWITCHING Figure 3-1Power Distribution and Switching Figure 3-2Power On-OffControl Circuit AUDIO/LOGIC DESCRIPTION (ALL MODELS) 3.3 AUDIO/LOGIC BOARD DIGITAL CIRCUIT VRH/VRL PE0 PE1 PE2 PE3 PA0 PA1 PA2 PA3 PA4/PA5 3.4 RECEIVE AUDIO/DATA PROCESSING Figure 3-3Audio and Data Processing Circuitry Block Diagram 3.5 TRANSMIT AUDIO/DATA PROCESSING 3.6 DISPLAY BOARD DISPLAY DESCRIPTION 3.7SYNTHESIZER CIRCUIT DESCRIPTION (UHF MODELS) UHF SYNTHESIZER DESCRIPTION 4-3Figure Diagram Block RF Models) (UHF DESCRIPTION SYNTHESIZER UHF DESCRIPTION CIRCUIT Page Page Figure 3-5Synthesizer Chip U804 Block Diagram 3.8RECEIVER CIRCUIT DESCRIPTION (UHF MODELS) UHF RECEIVER DESCRIPTION Figure 3-6Limiter/Detector U201 Block Diagram UHF TRANSMITTER DESCRIPTION 3.9TRANSMITTER CIRCUIT DESCRIPTION (UHF MODELS) Page Page 800/900 MHz SYNTHESIZER DESCRIPTION 3.10SYNTHESIZER CIRCUIT DESCRIPTION (800/900 MHz MODELS) 7-3Figure Models) MHz (800/900 DESCRIPTION SYNTHESIZER MHz 800/900 Normal Mode Talk-AroundMode Page Page Page 800/900 MHz RECEIVER DESCRIPTION 800/900 MHz TRANSMITTER DESCRIPTION 3.12TRANSMITTER CIRCUIT DESCRIPTION (800/900 MHz MODELS) Page Page Page SECTION 4 SERVICING American EIA Standard Japanese EIA Standard (pF) Color Multi Figure 4-1Simplified Synthesizer Block Diagram 4.3 SYNTHESIZER TROUBLESHOOTING Table 4-2SMD Inductor Identification Mode Supply Voltage Output Level Control Voltage VCO RF In (pin 6) Overall Div No. (K) = VCO freq ÷ “A” Divide No “N” Divide No Fractional-NDiv No. = (Fraction K) x 4.4RECEIVER SERVICING SECTION 5 PARTS LIST FRONT PANEL ASSEMBLY AND MECHANICAL PARTS FRONT PANEL ASSEMBLY AND MECHANICAL PARTS (CONT’D) UHF RF AND PA BOARDS UHF RF AND PA BOARDS (CONT ’D) Page Page Page Page Page Page Page Page Page Page Page Page Page 800/900 MHZ RF AND PA BOARDS 800/900 MHz RF AND PA BOARDS (CONT ’D) Page Page Page Page Page AUDIO/LOGIC BOARD (ALL MODELS) AUDIO/LOGIC BOARD (CONT’D) Page Page Page 9800-SERIESRADIO MOUNTING KIT 9800-SERIESREMOTE MOUNTING KIT DC POWER CABLE AND HARDWARE KIT PART NO. 023-9800-410(10 Ft) PART NO. 023-9800-422(22 Ft) FRONT PANEL EXPLODED VIEW FRONT AND TOP MECHANICAL PARTS BOTTOM MECHANICAL PARTS REMOTE TRANSCEIVER MECHANICAL PARTS REMOTE CONTROL UNIT MECHANICAL PARTS SECTION 6 SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS TRANSISTOR AND DIODE BASING DIAGRAMS Page Page CAUTION: INTERFACE BOARD LAYOUT INTERCONNECT SCHEMATIC DISPLAY BOARD TOP VIEW DISPLAY BOARD BOTTOM VIEW PROGRAMMING CABLE (P.N. 597-2002-200) RPI (P.N. 023-9800-000)BOARD LAYOUT RPI (P.N. 023-9800-000)SCHEMATIC RF BOARD COMPONENT LOCATOR GUIDE (UHF) UHF RF BOARD COMPONENT LOCATOR GUIDE (CONT’D) ’D) RF BOARD COMPONENT LOCATOR GUIDE (800/900 MHZ) Page Page Page Page RF BOARD SCHEMATIC (REVISED 430-470MHZ) PA BOARD SCHEMATIC (25W, 430-470MHZ)