To obtain the exact spin structure of the nuclear magnetically ordered phases of solid 3He, which in the bee lattice are the U2D2 and the high field phase, both occurring below about 1 mK, we started a project of neutron scattering at the Hahn-Meitner Institut, Berlin. This experiment faces three main difficugties: to grow a single crystal within the sinter needed for cooling, to cool the solid to temperatures below 1 mK (or even much lower in the case of the hcp lattice), and to keep it there long enough, even under neutron irradiation. As a first step we have performed pulsed NMR measurements in the ordered phases of solid 3He in a Ag sinter of 700 Å particle size down to temperatures of 400 µK at various molar volumes. The samples remained in the ordered state for as long as 140 h. In the low field phase a strong reduction of the Larmor line to nearly zero intensity was observed. With a sample grown over 6 h at the megting curve around 50 bars three lines at the Larrnor frequency and on its high frequency side were observed which seem to indicate a partly crystalline U2D2 phase in our sinter. The origin of the strong intensity drop, however, is not clear and needs further investigation.