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Yaesu - Baofeng converter

Use Baofeng accessories on Yaesu handheld radios and vice versa, includes programming & TNC connection

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A Yaesu FT-65 is an upgrade to the cheaper Baofeng UV-5R. Unfortunately, the choice of accessories for the FT-65 is limited, while there are plenty of accessories available for the Baofeng HTs.
This project provides an interface to connect Baofeng accessories to a Yaesu HT or connect Yaesu accessories to Baofeng HTs if you'd like.

For programming your HT without having to build anything, you could buy the cables recommended by hams.  I ended up buying a cable on AliExpress with a Prolific PL2303-chip (so says linux).  Unfortunately it doesn't program the Yaesu FT-65.

Luckily the fix is quite easy:

Disconnect red wire. Short TX-pad to RX-pad and leave white wire connected.

Once you have done this, keep in mind that your cable will no longer work for most other radios.

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BRD200226_R1.pdf

Design data revision R1 : schematic, assembly drawing, BoM

Adobe Portable Document Format - 108.99 kB - 05/17/2020 at 18:22

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  • 1 × Tensility 10-02130 Cable Stereo (3 Conductor, TRS) Phone Plug, 2.5mm, Right Angle To Phone Plug, 2.5mm, Right Angle 6.0' (1.83m)
  • 1 × Adafruit 4069 Cable Stereo Phone Plug, 3.5mm (1/8") To Phone Plug, 3.5mm (1/8") 3.3' (1.00m)

  • Board bring up & review R1

    Christoph Tack06/29/2020 at 19:53 0 comments

    Let's mention the stupid mistakes first:

    1. In the schematic, CN2 & CN3 are labeled as Yaesu interface, which is correct.  On the PCB layout however, these connectors are incorrectly labeled as Baofeng interface.
    2. The distance between CN2 & CN3 should be 7.62mm, not 12mm as it is now.

    With that out of the way, we can continue with what has been tested:

    1. Programming cable functionality of the Yaesu interface works correctly using:
      1. Yaesu FT65-E radio
      2. CHIRP daily-20200622 software
      3. FTDI TTL-232R-3V3-WE UART-cable
      4. Tensility 10-02130 2.5mm audio jack cable
    Parameters successfully downloaded from FT-65

  • TNC Connection

    Christoph Tack05/02/2020 at 18:28 0 comments

    Chirp

    The go-to tool for configuring your radio from the PC.

    Don't use the Chirp from your standard Linux distro, it's likely to be some 3 year old version.  Install from another ppa.

    TRRS connection on Android phones and Lenovo Thinkpad L580

    1. TIP : left audio (30 to 40ohm to ground)
    2. RING1 : right audio (30 to 40ohm to ground)
    3. RING2 : ground
    4. SLEEVE : microphone
      1. sometimes there's a switch to ground in parallel with the mic.
      2. In case of a Samsung headset, there's a "100ohm resistor in series with a switch to gnd" connected to this pin.

    Aprsdroid

    Reference

  • Baofeng pinout

    Christoph Tack04/21/2020 at 19:07 0 comments
  • Yaesu FT-65 pinout

    Christoph Tack04/20/2020 at 19:07 0 comments

    Compatible to Motorola M(1) style 2 pin connector, although that connector using mono jacks.

    3.5mm jack


    Signal
    TipSPK- (Vcm = 2.5V)
    Ring
    internal 10K PU to 3V3, unknown purpose
    Short circuited to sleeve when using the SSM-17B Hand speaker Mic. 
    Maybe that's the reason why Yaesu doesn't market the SSM-17B as an accessory to the FT-65.  The SSM-512B is advised instead.
    Sleeve    
    SPK+ (Vcm = 2.5V)

    2.5mm jack


    Signal
    Tip
    • MIC : 100nF to 10µF AC-coupling from tip to microphone element
    • PTT : Put 2Kohm from tip to GND to enable PTT.
    RingRX/TX Short circuited to sleeve when using the SSM-17B Hand speaker Mic.
    Use open drain TX and connect it to RX. 
    Another option is to connect the anode of a diode to the RX-line. 
    Connect the cathode of that same diode to the TX-line.
    SleeveGND

    References

  • Connector selection

    Christoph Tack04/19/2020 at 10:23 0 comments

    Audio jacks

    The center to center distance of the audio plugs on the the Yaesu is only 0.3".  So narrow audio jacks must be selected.  Through hole is preferred.  These connectors are likely to be more sturdy and narrower than their SMD counterparts.

    2.5mm audio jacks

    Digikey selection

    SJ1-2503A :5mm wide, center 2.5mm above PCB

    3.5mm audio jacks

    Digikey selection

    STX-3501-3N : 6mm wide, center 2.5mm above PCB

    Audio cable assemblies

    You should be very carefully about what cable assemblies you buy for this.  The connectors on the Yaesu are very close to each other, you'll never be able to plug in two standard cables.

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