ADS Antenna-Disconnect-Switch Assembly And Operation Manual
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ADS© 2018 – DL4ZAO – Status: Preliminary v010 Seite 2IntroductionThe ADS is a remote controlled switch, that completely disconnects the antenna from your radio andgrounds the antenna. It is designed to prevent transient overvoltage due to lightning and atmosphericsurge effects damaging your radio equipment. The Antenna Disconnect Switch is installed at the outputfrom your transceiver, power amplifier, or antenna tuner in line with the antenna’s coaxial feedline.When the Power is turned OFF, the antenna’s coax signal wire and shield are shorted together andgrounded, and both the coax center and coax shield are disconnected from the radio. When the ADSgets powered ON, it re-connects the antenna for normal operating. It and can handle 1.5 kW RF PeakPower up to 50 MHz. With reduced power it is possible to use the ADS even at higher frequencies.Important notice: For maximum protection a good earth ground connection is essential. See chapter“ground earth connection” for details.Functional diagramElectrical characteristics Supply/activation voltage DC 10-18 Volt Operating current typ. 75 mA when activated/connected (at 12V Supply voltage) RF-Connectors: female SO239/UHF coaxial socket Antenna Socket fully isolated against case, RX/TX socket - braid connected to case Supply connector: 2-pole screw terminal, twin core flexible lead Case -aluminum diecast, dimension: 112 x 60 x 42 mm Earth ground connection through a ground screw connected with the metal enclosure, or Earth ground connection via the box flange-cover mounted on a metal plate connected to Earth Transmission loss <0.05 dB up to 30 MHz, <0.12 dB up to 70 MHz, return-loss > 26dB Max. Power: 1,5 KW PEP ( up to 30 MHz, 50% Duty Cycle, Load SWR <2) Antenna through-connection is activated when Power applied Remote controlled “OFF”, activated by manual or open collector switching Connected/Activated condition is indicated by a green LED Gas-Discharge Tube to provide supplementary surge protection during operationrelay-contacts shown in condition“deactivated” (Supply Voltage „OFF“) |
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