MTR5B is not working with batteries

Discussion in 'General Technical Questions and Answers' started by W4RAM, Sep 5, 2020.

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  1. W4RAM

    W4RAM Premium Subscriber QRZ Page

    Good morning,
    Asking for assistant with the following issue:
    My MTR5B is not working with batteries. I tried with one 9v battery, also with a battery case x 6AA using Ni-MH 1.2v 2850 mAh, and also a LiPo 7.4v 5200mAh with the same result.

    If I use 12-13.8v power supply radio works fine.
    Thank you for your assistant,

  2. N8TGQ

    N8TGQ Ham Member QRZ Page

    Were they all using the same plug and wiring to the radio? Check the easy stuff first.
  3. N3PM

    N3PM Ham Member QRZ Page

    Was this built from a kit, and did it ever work?
    Mike N3PM
  4. KG7WGX

    KG7WGX XML Subscriber QRZ Page

    I have a MTR-4B, which is similar to the MTR-5B.

    I use an 8-cell holder with NiMH batteries, or a standard 9v transistor battery for a quick outing. The 8-cell holder has standard 9v connectors, so the same power cable works for both.

    You might check the voltage when the rig is powered on to see what it actually "sees".

    Also, I would be careful using voltages higher than 12 volts with these little rigs. The manual says that is a maximum. Power supplies which work fine with a KX3 can fry the Mountaintopper.
  5. W4RAM

    W4RAM Premium Subscriber QRZ Page

    Mr. Pavelko, thank you for reply, I tried using different plug/cables, with the same result.
    MTR-5B work fine when power supply is used.
    Thank you

  6. W4RAM

    W4RAM Premium Subscriber QRZ Page

    Mr. Zyara,
    Thank you for reply, MTR-5B was bought already assembled.

  7. W4RAM

    W4RAM Premium Subscriber QRZ Page

    Mr. Mazur,
    Good morning,
    I think the same, this is the only possible reason (feeded with 13.8v),
    the radio was working perfect, now it only works if I connect it to a power supply.
    I will check the voltage per your recommendation, thank you


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