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Mounting instructions PLL controller Cybernet PTBM048AOX
Version 3/10/2024 © Jef Collin
Important: these instructions are for Cybernet PTBM048AOX platform (as used in many old CB radio's under many
brand names) and similar ones using a PLL02A. Although the concept might work in many others the software needs
to be adapted to match channels and/or PLL. Basic electronic skills are implied, don't do this installation if you
cannot distinguish a resistor from a capacitor or lack decent soldering skills. I am not responsible for what you build
and how you use it.
The software is designed for 240 channels, -120 to +120, the actual range will depend on the VCO range and
adjustments to transmitter and receiver circuit. The VCO will probably need adjustment to go beyond the 40
standard channels and the transmitter/receiver coils might need adjustment. Be very careful, the ferrite cores break
easily, use a nonmagnetic screwdriver. Once the actual range is determined you can set the limits in the menu (refer
to the user guide).
Prepare OLED, rotary encoder and PCB with
connector pins except PLL 0-6&GND mounted.
Clip the ends of the header pins on the OLED
display so they can't touch the metal frame of
the radio after mounting.
Use a rotary encoder with debounce
components fitted. Note that some encoders
work backwards, in that case switch pins S1 and
S2 or change pin allocations in the source code.
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Summary of Contents for Cybernet PTBM048AOX
- Page 1 Version 3/10/2024 © Jef Collin Important: these instructions are for Cybernet PTBM048AOX platform (as used in many old CB radio’s under many brand names) and similar ones using a PLL02A. Although the concept might work in many others the software needs to be adapted to match channels and/or PLL.
- Page 2 Use long header pins for PLL 0-6&GND. Solder long header pins to PLL 0-6&GND. Pinout of PLL02A. We will be using P0-P8, LD and VSS (ground). Prepare the CB radio, remove the channel switch and display. Isolate pins 7, 8 and 9 of PLL02A by cutting traces.
- Page 3 Make sure the row of holes in front of PLL02A pins 9-16 are free of solder. Use a 0.9mm drill bit to enlarge these holes to fit the long header pins. Clean up the flux around the area when this preparation work is done.
- Page 4 Connect SQ (Squelch) to base of Q34. Connect OLED and encoder, note the locations of pins 1. Wires of OLED and encoder line up directly with the pins if mounted as instructed. The PLL board needs a 5V power supply. Drill a hole of 3,5mm and mount a 7805 regulator using an insulating pad, plastic collar and thermal paste.
- Page 5 Connect 5V output of the regulator to the +5V pin of the PCB. Connect ground of the regulator to a closeby ground on the main PCB. The GND pin on the PLL board does not need to be connected since the GND pin next to it is already connected to ground via PLL02A pin 16.
- Page 6 There is a function in the software to make it easier to mark the extends of the display in case you need to cut out a window in the front panel. Press and hold the encoder whole turning on the radio will show a white screen.
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