SEL pin=A>B
10Mhz to 20GHz in 800 steps
IF BW = 1kHz
sweep pow = -15dBm

port order:
HD3SS3212 pin name	s12p file port#
A0p			1
A0n			2
B0p			3
B0n			4
A1p			5
A1n			6
C0p			7
C0n			8
B1p			9
B1n			10
C1p			11
C1n			12