Quadrature

15 ~ 40MHz 90 degree power divider, quadrature coupler, 3dB bridge RF coaxial
US $80.98
Four Way Quadrature Signal Generator AD9959 DDS Core Board AD9854 200MHZ
US $88.00
Four channel quadrature signal generator AD9959 DDS core board AD9854 200MHZ
US $68.88
HackRF One Software Defined Radio RTL SDR 1MHz to 6 GHz 8bit Quadrature for RF
US $254.25
Heidenhain rotary encoder ECN1313 2048 elevator parts quadrature encoder
US $28.50