PM3A USB kits are Single Board kits and
includes one channel of RF measurement. AD8307 in SO8 is included
and is pre-soldered on board. Its available with USB PC connectivity
module (FTDI232RL chip) as an option.
USB Connectivity Add-on module is only required
for extracting data from PM3a to PC.
Board has facility to add another channel of
A/D by way of adding one more AD8307 SO8 and associated SMT
capacitors and resistors. This is not supported by kits and
available to experienced users looking for second channel for POLAR
Plotter type of PC Software.