I am currently using ADRF6806 eval board.
My RF input is 144.5MHz, and an LO of 140MHz. When I measure the Single-ended baseband output of the balun at the power meter taken at different input level, I get the following values:
@ -10dBm input ---- output level = -19.34dBm
@ 0 dBm input ---- output level = -9.4 dBm
I just can't determine the origin of this values since I was just expecting an output of -9 and 1dBm, or a value closer, for an input of -10 and 0dBm respectively.
The instruments that I use are very well calibrated before the measurement is done.
What might be the possible problem?