| 摘要 |
PURPOSE:To reduce the power consumption of the dehydrator by controlling one continuous operation time within the upper limit value and subsequent one pause time to the lower limit value or more in case the means sending the dry air by pressure is installed within the antenna feed line. CONSTITUTION:Normal-closed contact switch circuit 11 to turn on and off the supply to dry air supply mechanism 12 and active current detector 13 are installed between power source 10 and mechanism 12 constituting the dehydrat or for antenna feed line. Mechanism 12 includes intake vent 12a, drier 12b incorporating the silica gel, compressor 12c and others, and as a result the pressure can be kept constant at all times between the dry air to be sent into waveguide 16 provided outside mechanism 12 and the outside air. Furthermore, timer 14 is connected to circuit 11 and detector 13 along with timer 15 connected to detector 13 and timer 14 each, thus circuit 11 being opened and closed. In this case, the operation and discontinuation periods of mechanism 12 are set by the timer, and thus the power increment is prevented in case the airtightness is impaired for the feed line. |
