The material presented above, concerning the properties and possible radiophysical applications of low-temperature ferroelectrics, strontium titanate and potassium tantalate crystals, can be summarized as follows. The problem of the dielectric nonlinearity of these crystals can be assumed to be mainly solved. The mechanism for the nonlinearity is known; successful approaches to the problem exist: thermodynamic, microscopic, and model approaches; experimental results agree with theory. Much less success has been attained up to now in understanding the mechanism of dielectric losses, in particular, in the uhf range, and especially with deep cooling of the non-linear crystals. Information concerning losses in strontium titanate is relatively complete, although in this case a number of fundamental problems remain. These include problems related to the effect of a structural phase transition at 110°K, volume charge, and nearelectrode phenomena on the losses. Losses in potassium tantalate have not been studied adequately. It is necessary to study experimentally the frequency and temperature dependences of losses in KTaO3 at least in the range 1–40 GHz with cooling to 4.2°K and lower. Comparison of the properties of KTaO3 and SrTiO3 crystals can greatly improve our understanding of the mechanisms for low-temperature dielectric losses in ferroelectrics. The problem of parametric interactions in nonlinear systems based on low-temperature ferroelectrics is solved simultaneously with the problem of losses because, as noted in Section 3, excess losses in these crystals are the main obstacle to creating efficient parametric uhf systems operating in the continuous regime.