The Model GR101 cryocooler unit is used to cool superconducting interference rejection filters in cellular and personal communication system (“PCS”) base stations. The complete unit is composed of four major components: the coldhead which is comprised of a motor portion (includes motor, low and high pressure valves and housing) and a cooling accumulator (includes piston and housing). The coldhead contains unliquified helium gas (17 kg/cm2) that is compressed by the motor-activated piston, thus creating the extremely cold temperature (77K or –196 oC). Helium gas is circulated to and from the compressor via two pressure ports. The low pressure port receives helium gas from the compressor. The high pressure port sends helium gas back to the compressor. the helium gas compressor which is used to compress helium gas for circulation within the cryocooler system. The compressor is a rotary unit with a power consumption 0.8 kilowatts (kW). a set of flexible hoses which connect the coldhead and the compressor, thus allowing the transfer of helium gas back and forth between the two components via the low and high pressure ports. The flexible hoses, imported with fittings attached, are made of strengthened, metal-mesh reinforced plastic with a maximum burst pressure of 3.5 Mpa. and a set of expanding cables which provide the electrical source from the compressor to the coldhead. These insulated electrical cables are rated 100 volts and are imported with connectors.
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