Effects on reflectometer phase ~ϕ and power ~P fluctuation signals due to (a) asymmetries in the transmit - plasma - receive antenna geometry (misalignments), and (b) asymmetries in the plasma cutoff layer perturbations (distortions from sinusoidal or Gaussian) are studied using a two dimensional (2D) physical optics model. Results show the onset of phase runaway with antenna misalignment and/or sawtooth type perturbations when the perturbation amplitude exceeds some critical value. For broadband (Gaussian) turbulence antenna misalignment leads to Doppler shifts in the ~ϕ spectrum - provided the reflectometer beam width w, and spectral width kw of the turbulence are sufficiently large. Misalignment also generates coherence between ~ϕ and ~P at Bragg backscatter frequencies with quadrature (±π/2) phase difference. Sawtooth (asymmetric gradient) perturbations also generate phase-power coherence in quadrature, but at frequencies determined by w and kw, i.e. not Bragg. Cusped or spiky (asymmetric amplitude) perturbations generate asymmetric phase distributions (non-linear phase offsets) and low frequency phase-power coherence with 0 or π phase difference. The simulations indicate that a combination of antenna misalignment (or plasma tilt) and cusped reflection layer perturbations can account for a wide range of experimentally reported features in reflectometer signals. Conference Table of Contents JET assigns a single Preprint number to a group of Conference Papers. The JET Preprints and Reports service holds Conference Papers in a dedicated Conference Papers section.