So I am gonna give the reflectometer plan a try, I also found a IC that provides phase and Magnitude. Only problem now is generating 868 MHz. I found a signal solution for $150.00
Key Features:
· Frequency Range is 35MHz to 4.4GHz
· 50 ohm system
· Frequency resolution is 1khz
· RF Pulse Capability (EMC Immunity Testing)
· PLL synthesized RF signal generator, controlled and powered by a PC running Windows via its USB port.
· RF Step Function included
Selectable time base per step and selectable step size.
Steps start and stop frequency can loop or Single Step function
Includes a "Single" step button. Single step forward or backwards
· Improved performance and phase noise (Phase Noise measured at 10KHz offset at 2.4GHz was -88dBc/Hz)
· 4 layer PCB versus 2 layers of similar models. This is a quality made product.
· RF Output Standard SMA Connector: Select 4 Power levels. Maximum outputs are:
1.35MHz - 4GHz = +15dBm +/- 2dB
So let me know what you think? The more I think about it, the better the MiniVNA sounds