Gary, I must be misreading something or you had a typo. RF Board U8 is a voltage regulator - you will not find any RF there. 73, Don W3FPR Gary Montalbine wrote: > Thanks all for the response. My RF probe works at TP1 and the PLL and > VCO circuits. U8 was where I had no voltage and was unsure of the probe. > Need to check further. > > Gary, WA4SZI >