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  • 11/05/2025

    We have arrived safely as scheduled.

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  • 04/05/2025

    The amplifier works OK. With a control power of 2W, I achieved output from 32W to 49W depending on the band. The automatic switching of output filters with the DATA signal does not work because there is no LM3914 chip on the PCB, a voltage regulator for the LM3914, and a voltage divider. Note that there is an error on the PCB, and the control of the DATA signal for band switching, after soldering the LM3914 chip, operates in reverse to what it should. A voltage of 460mV should activate the 80m band, but it activates the 10/15m band. I used an additional PCB where I placed the LM3914, a 9V voltage regulator, and a miniature 5kohm potentiometer. I connected the outputs of the LM3914 to the corresponding soldering points on the amplifier's PCB so that 460-690mV activates the 80m filter, a voltage of 920-1150mV activates the 40m filter, 1380-1610mV activates the 17/20m filter, and a voltage of 1840-2300mV activates the filter for 10/15m. It works perfectly. The DATA wire from the control socket should be unsoldered from the switch and connected to PIN5 of the LM3914.

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