Abstract: In a security system, a method and apparatus for two-way frequency hopping communications between the control panel and each peripheral device which maintains channel synchronization through the assignment of fixed beacon frequencies for the transmission of synchronizing data. The use of frequency hopping provides high immunity to jamming and interference, reduced occurrence of multi-path phenomena, and allows for transmissions at a much higher output power than conventional fixed-frequency communications, to thus increase the effective range of the peripheral devices while providing effective and reliable two-way communications between the control panel and the peripheral devices. The invention also provides a large number of channels, which allows for actuators such as sirens, strobes and line seizing devices to be wireless in addition to sensors.

Abstract: A method of charging a discharged battery by creating a level direct current carrier and a riding alternating current charging vector which rides on the level direct current, the alternating current having a repeating waveform comprising two phase displacements per wavelength.

Abstract: A method for storing, thawing and transferring frozen embryos to recipient animals is disclosed which provides the advantage of a one step dilution, to eliminate damage from the cryoprotective solution after thawing, and immediate transfer to the recipient animal. Also disclosed is an apparatus for freezing, storing, thawing and transferring frozen embryos to recipients which comprises a container having first and second chambers wherein a volume of cryoprotective solution containing the embryo can be stored in the first chamber and an effective volumetric amount of a diluent solution can be stored in the second chamber the chambers being divided by removable separation means so as to provide for a dilution process within a single field container.

Abstract: A method for storing, thawing and transferring frozen embryos to recipient animals is disclosed which provides the advantage of a one step dilution, to elminate damage from the cryoprotective solution after thawing, and immediate transfer to the recipient animal. Also disclosed is an apparatus for freezing, storing, thawing and transferring frozen embryos to recipients which comprises a container having first and second chambers wherein a volume of cryoprotective solution containing the embryo can be stored in the first chamber and an effective volumetric amount of a diluent solution can be stored in the second chamber the chambers being divided by removable separation means so as to provide for a dilution process within a single field container.