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Old Radio Description

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By Georgi Dachev
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Old Radio Description

In 2000-2001, we developed a transceiver featuring a frequency synthesizer controlled by Microchip’s PIC16F84/88 microcontroller. The voltage-controlled oscillator (VCO) implementation utilizes Philips HEF4750V and HEF4751V integrated circuits.

old_radio_a
old_radio_b
old_radio_front
old_radio_side
old_radio_top_a
old_radio_top_b
old_radio_bottom_b
old_radio_bottom_a
old_radio_middle_c
old_radio_middle_a
old_radio_middle_b
old_radio_hef4750v_hef4751v
old_radio_pic16f84_controlling_b
old_radio_pic16f84_controlling_c
old_radio_pic16f84_controlling_a
old_radio_amplifier_a
old_radio_amplifier_b
old_radio_amplifier_c

Description

Our initial architecture centered on a microcontroller-driven VCO synthesizer implementation. The development process involved significant challenges in both firmware development and hardware verification.

This project marked our first implementation of assembly code for the PIC16F84 platform, establishing our foundation in embedded systems development. We later migrated to the PIC16F88 microcontroller to leverage its expanded memory capacity for enhanced functionality.

The final system architecture delivered a custom SSB/CW transceiver with 10Hz frequency resolution, dual-frequency operation capability, and a user interface comprising an LCD display and control keypad.

Transceivers , Old Radio
Old Radio SSB CW PIC16F84 PIC16F88 HEF4750V HEF4751V
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