I had a fact about lm1086 datasheet

lm1086 datasheet

But when I use input voltage from a LM1086 LM1086VarVoltage.jpg , which with a 20V input from a "wall wart" allows variable voltage up to ~17V, voltage from the output of the voltage divider isn't correct the PIC Vdd is from a 7805 from a seperate wall wart . Vout/Vin 4.0 3.2 2.0 1.6 Vin 4.9 with Vin from uP supply Vout Calc 1.22 1.55 2.43 3.14 Vout Meas 1.24 1.58 2.45 3.15 Vin 6.27 with Vin from battery Vout Calc 1.56 1.98 3.11 4.02 Vout Meas 1.60 2.04 3.12 4.00 Vin 6.01 with Vin from LM1086IT adj voltage reg Vout Calc 1.50 1.90 2.99 3.85 Vout Meas 1.21 1.46 2.11 2.63 Thanks in advance for any help/advice.
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