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  1. 2

    Motorola 555 ssb base tx issue

    Change the AM power regulator. It’s too weak stock and failed under warranty many times. I replaced many out of warranty with a good TIP3055 and small heatsink or an equivalent. Ssb Bias should be fine. I Check this with no modulation and on (lsb or usb) SSB mode in transmit. Use a multi meter...
  2. 2

    Motorola 555 ssb base tx issue

    The AM Pass regulator transistor is too small for stock. We replaced them under factory warranty. Use a Tip3055 to replace!
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