[hpsdr] Penny Power Control

[FRANCIS CARCIA]

Hi All,Early Penny power control was DAC  digital bits. A later hardware modification used a PWM output from the FPGA togenerate a variable reference voltage to the DAC. This improved the TX IMD by always using all the DAC bits at low power.The change is fairly simple if i remember. (An RC and a couple cuts/ jumpers)   So if you are using older hardware you may not be able to control the output power because the DAC reference is a fixed voltage.Frank WA1GFZ
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