The gyrowave interaction experiment yields the impressed modulation as a function of time delay (meeting height) between the wanted and the disturbing radio frequency pulses. This is referred to as the Fejer curve. In this paper we compute the Fejer curves for the geomagnetic conditions of Delhi, using an exponential model of the D region ionization, temperature dependent energy relaxation factor G, a model collision frequency v of the Sen-Wyller magnetoionic theory, and the standard wave interaction theory. The Fejer curves are then inverted to recover the electron density profile, thus completing the close circuit computation. In the process of inversion of the Fejer curve the D region is assumed to be isothermal, and the effect of this assumption is investigated. It is found that it is possible to recover the original electron density profile if the mean D region temperature is adopted.