<html><head></head><body><div class="yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div dir="ltr" data-setdir="false">Hi All,</div><div dir="ltr" data-setdir="false">Early Penny power control was DAC digital bits. A later hardware modification used a PWM output from the FPGA to</div><div dir="ltr" data-setdir="false">generate a variable reference voltage to the DAC. This improved the TX IMD by always using all the DAC bits at low power.</div><div dir="ltr" data-setdir="false">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.</div><div dir="ltr" data-setdir="false">Frank WA1GFZ</div></div></body></html>