Yaesu FT-x3R FT-23R, FT-33R, FT-73R, FT-2008, FT-7008, FT-211RH radio Modifications instructions

Below you will find brief information for radio FT-23R, radio FT-33R, radio FT-73R, radio FT-211RH. This document describes modifications that can be made to Yaesu FT-23R, FT-33R, and FT-73R radios to extend their frequency coverage. These modifications can open the CPU to 50-300 Mhz or 220-550 Mhz coverage, as well as provide full frequency coverage on the FT-33R. The document includes instructions on how to disassemble and reassemble the radio, as well as a chart detailing the jumpers that need to be opened or closed for each frequency range. The document also describes how to achieve 9600 BPS with the Yaesu FT-211RH modem, as well as how to work in packet-radio mode with the FT-23/73 radios.

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Yaesu FT-23R, FT-33R, FT-73R Modification Instructions | Manualzz

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Key features

  • Frequency coverage extension
  • Commercial mode activation
  • Memory mode changes
  • Packet radio support
  • 9600 BPS modem compatibility

Frequently asked questions

You can extend the frequency coverage by modifying the CPU board jumpers. The document provides a chart detailing which jumpers to open or close for each frequency range. However, this modification will erase all prior settings on the radio.

To activate the commercial mode, you need to remove the solder bridge labeled number nine on the CPU board. To flip back to the amateur mode, you would press the F Up arrow key. To flip back to the commercial mode, you would press the F Down arrow key.

To achieve 9600 BPS with the Yaesu FT-211RH modem, you need to connect the screened lead inner to TK10420 IC pin 9 and the outer screen to pin 15 on the RX "IF UNIT" sub board. You also need to unsolder the leg nearest to the rear of the "MAIN UNIT" potentiometer and connect the inner of the screened TX leads to this point and the outer to the earth plane adjacent to this point. Finally, you need to place a 560 ohm resistor across the screened lead inner/outer.
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