John,
Actually there are two 7805 types of regulators in the uBITX design.? One as you pointed out supplies the Raduino.? The other is an SMD version soldered on the mainboard for the bias voltage on the finals (in the blue box of the screen shot of a section of the uBITX schematic).? That one is the one that I asked for the measurements.??
Still, I agree that it is a strange coincedence that the difference is 5Vdc.
Aaron,
The voltage measurements should be made in refference to the supply negative, any of the ground points on the connectors like the shiled of the BNC RF connector.? Another point would be pin 3 of the P1 power connector that is not used.
73
Evan
AC9TU
