Rindler light-transfer frequency ratio (${\omega }_{\mathrm{recv}}/{\omega }_{\mathrm{emit}}={\xi }_{\mathrm{emit}}/{\xi }_{\mathrm{recv}}$)

Static observers at positive Rindler radii $\xi$ follow hyperbolae $x^2-c^2{t}^2={\xi }^2$. Their proper clock rates scale with $\xi$ at fixed Rindler time, so light received at smaller radius is blueshifted by the ratio of emitter to receiver radii. A direct Doppler calculation at emission and reception gives the same result.