Ramsey Electronics FX-223 User Manual

220 MHZ AMATEUR PLL
SYNTHESIZED FM
TRANSCEIVER 220 - 240
Ramsey Electronics Model No. FX-223
Published in Three Sections:
• FX-series General Reference Information
• Kit Assembly Phase I: Circuit Stages A through F
• Kit Assembly Phase II: Circuit Stages G through TX
Plus:
• Fold-out Schematic Diagram
• Synthesized - no crystals to buy !
• Perky 5 watt RF output
• Dual conversion sensitive receiver with crystal and ceramic IF filters
• PACKET ready ! Dedicated packet interface connector on back!
• 12 Channels, expandable to as many as you want - programmed with
diodes !
• Easy 4 evening assembly - need only a voltmeter and another rig for
testing
• Fantastic manual teaches as you build, rig is assembled in bite-sized
sections that are tested as you build - your kit will work first time !
• Rig operate over 20 MHz of band, great for snooping out of band !

Ramsey Electronics FX-223 Specifications

General

Brand	Ramsey Electronics
Model	FX-223
Category	Transceiver
Language	English

Summary

FX-223 GENERAL REFERENCE INFORMATION

FX-223 Technical Specifications

Detailed technical specifications of the FX-223 transceiver.

DC Power Supply Considerations

Essential information and precautions for powering the transceiver.

FX-223 CIRCUIT OVERVIEW

KIT ASSEMBLY: PHASE 1

Stage A: DC Power Input, Regulation, and Distribution. Plus, Packet Radio I/O Connector (J1).

Assembly steps for power input, regulation, and the packet data connector.

Stage B: Receiver Audio Amplifier and Speaker Connection

Assembly steps for the receiver audio amplifier circuit and speaker connection.

Stage CR: FM RECEIVER CIRCUIT DUAL CONVERSION SUPERHET WITH IF FILTERS

Stage DR: Receiver Tuned RF Input and Preamp

Stages E - F: Transceiver VCO (Voltage Controlled Oscillator) and Buffer Stages

KIT ASSEMBLY: PHASE 2

Stage G: The PLL Synthesizer: Understanding and Assembly

Steps to build and understand the PLL frequency synthesizer.

Stage H: Frequency Programming, Understanding and Building your Diode Matrix

Instructions for building and programming the diode matrix for frequency selection.

Stage M: Microphone Amplifier and Push-to-Talk Switching

Stage TX: Transmitter, Buffer and Final Amplifier

Assembly of the transmitter buffer, driver, and final amplifier stages.