This is the heart of the data book. It provides a chart showing the relationship between the binary code input (from the channel selector) and the output frequency. For example, the book will show you exactly what divider ratio is selected when you turn the knob to Channel 19. This allows a technician to verify if the digital logic is working correctly even if the RF section is dead.
: Hosts various digitized versions and community-uploaded lists, including The Defpom CB Radio PLL List and summaries of Motorola PLL Data Books . Key Chips Frequently Covered
The (primarily authored by Lou Franklin) is a definitive technical reference for understanding, repairing, and modifying Phase-Locked Loop (PLL) circuits in CB radios. It is widely used by technicians to expand channel counts or convert radios to the 10-Meter Ham band. Core Technical Content cb pll data book pdf
Using the data book, locate the reference crystal (e.g., 10.240 MHz). Measure it with a frequency counter. If it is off by even 100 Hz, the radio will be off by ~4 kHz on channel 40.
: Instructions for expanding frequency coverage, such as converting a CB radio for the 10-meter ham band or unlocking more channels. Popular PLL Integrated Circuits This is the heart of the data book
The primary function of the data book is to demystify the complex digital circuits that replaced older, multi-crystal frequency generation systems. By using a PLL, a radio can generate dozens or hundreds of channels using a single stable crystal and a programmable divider chip. For technicians and hobbyists, the book provides the "Truth Charts" (logic states) required to troubleshoot or expand these frequencies. Key Contents of the Manual A standard edition, such as the International Edition available at RF Parts , typically includes: The CB PLL Data Book for CB Radios - SM0VPO
Arguably the most common PLL in 40-channel AM radios. Found in Uniden, Cobra, and Realistic units. The data book reveals how to modify it for “extra channels” above 40. This allows a technician to verify if the
The now-defunct CBTricks website had a massive repository. Many mirrors exist on Internet Archive (archive.org). Search for “CBTricks PLL Data Book PDF.”
A is an essential technical resource for CB radio hobbyists and professional technicians. It provides detailed specifications, pin-by-pin functional descriptions, and modification guides for the Phase-Locked Loop (PLL) integrated circuits that manage frequency synthesis in modern transceivers. Purpose and Core Content
By keeping a copy of this data book on your smartphone or laptop, you are preserving decades of radio history. Whether you realign a vintage Cobra, design a retro PLL synthesizer, or simply marvel at the binary logic of 1970s channel programming, this PDF is your ultimate companion.