The 430-MHz radar ar Arecibo has been used both to produce and to measure electron temperature increases in the lower ionosphere. The 430-MHz transmitter produced heating pulses from 0.2 to 6.0 ms in length having a maximum power flux of 12 W/m2 at 100 km. For the first time, both the spectrum and the total power of the incoherent scatter signals wee used to measure the electron temperature increases in the 65 to 110-km altitude region. When the measured electron temperature increases are compared to the results of an ohmic heating model, measured increases are found to be significantly smaller than the predicted increases. Possible explanations for this lack of agreement, such as a non-Maxwellian electron temperature distribution or increased electron cooling rates, are discussed.