Modifications for the transceiver Kenwood TR-9130

• new control board with a Raspberry Pi Pico
• OLED display
• new PLL with TCXO, step size 10 Hz
• CTCSS encoder
• 100 memory channels without backup battery

Circuit diagrams

CONTROL UNIT

The CTCSS output can be connected directly to the FM modulator. The correct point is R15 / C17 / D1 on the DRIVE UNIT.

PLL UNIT

Changes compared to the original user manual

Memory channels

• The memory channels are selected with the main dial. The switches for shift and CTCSS are irrelevant in memory mode (MR switch on).

• Special memory channels, selected with the memory switch:

  • 1 Scanner start frequency
  • 2 Scanner stop frequency
  • 3 to 5 not used (the same as 6 at the moment)
  • 6 normal operation

  The special memory channels must be saved with the M button to take effect.

Save and delete memory channels

Press the M button when in memory mode (MR switched on) and follow the instructions in the display.

Step size

Decrease and increase the step size with the former scan and hold buttons.

Scanner

Use the rotary encoder button to start and stop the scanner in vfo or memory mode. It can also be stopped with the ptt button.

No RIT

The RIT is not supported.

CTCSS encoder

Set the mode switch to FM1 to switch on the CTCSS encoder. You can use the main dial to set the sub-tone frequency.

Unused contols

• RIT rotary knob and switch
• DS switch
• MS switch

Installation

• Connect your Raspberry Pi Pico to the PC while holding down the BOOTSEL button.
• The Pico should appear as a mass storage device. Copy the tr-pll.uf2 file from the latest release to it.

OPTIONAL (notes in German)