Uniden PC999 - User Manual

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UNIDEN
'EXPORT”
SERVICE
MANUAL
PB010 CHASSIS (COBRA 148GTL-DX, SUPERSTAR 360 FM)
PB042 CHASSIS (PRESIDENT JACKSON)
PC999 CHASSIS (PRESIDENT GRANT)
OTHER UNIDEN CB CHASSIS - APPLICATIONS
The information in this bookcan be applied to many other
Uniden CB radios since all the current production units
are basically the same.
Examples are:
Stalker 9-FDX, President McKinley export (PC 893).
This uses the MB 8719 and is an 80-channel transceiver
using a single loop Oscillatorcrystal in the 15 MHz range.
It is AM/FM/SSB and same versions also hâve the
British CB band which is switched in by anothercrystal on
a separate sub-PC board.
Cobra 146GTL. President AR-144/AX-144, Midland
6001/7000 (new version), Realistic TRÇ451,
Sears 663.3810, Uniden PC-244. This is basically
identical except for the lack of FM, and the PLL circuit
which uses a uPD2824 ROM chip..

Summary

PC999 Specifications

PB042 Specifications

General Specifications

Receiver Specifications

Receiver performance metrics for the PB042.

Transmitter Specifications

Transmitter performance metrics for the PB042.

PLL Synthesizer Circuit Description

Master PLL Mixing and Programming Chart

Abbreviated Circuit Description

Local Oscillator & Carrier Oscillator

RF Stage

IF Stage

Additional Circuit Details

Transmitter Mode Descriptions

AM Transmission Mode

Description of the AM transmission process.

FM Transmission Mode

Description of the FM transmission process.

SSB Transmission Mode

Description of the SSB transmission process.

Service Notes, Modifications & Improvements

SSB AGC Improvement (PB042)

Modifying SSB AGC for the PB042 chassis.

Clarifier Unlock & Frequency Expansion (PC999)

Modifications for PC999 clarifier and frequency.

Doubling RF Power Output (PB010)

Procedure to double RF power output on PB010.

Further Service Notes and Modifications

Roger Beep Disconnection (PB010)

10 KHz Up-Shift Modification (PB010;PC999)

Frequency Expansion (PB010)

PLL Synthesizer Alignment Procedure

Transmitter Alignment Procedure

Receiver Alignment Procedure

Uniden PC999 Specifications

General

Channels	40
RF Output Power	4 Watts
ANL/Noise Blanker	Yes
S/RF Meter	Yes
PA Function	Yes
Frequency Range	26.965-27.405 MHz