An electro-hydraulic power unit with an improved hydraulic fluid flow through the unit. One method includes forming a pattern of channels in the myocardium leading from healthy tissue to hibernating tissue. , up to four interferer frequencies in a GNSS receiver base band circuit a raw digital signal is, in a band stop unit, shifted, by a first mixer, by the negative of the first interferer frequency in the frequency domain whereupon the continuous wave interferer is suppressed by a band stop filter, a linear phase FIR filter with a suppression band centered at zero, e.