Acom 04AT Operating Manual
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Contents
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20202.5.3 RADIO FREQUENCY GROUNDING OR COUNTERPOISEThis grounding is used for protection from transmitted/induced RF signals, and pos-sible radio frequency interferences. It will not protect you from a possible lightningstrike or currents with mains frequency. These may be e.g. RF counterpoises (radials),which, in particular, could even be isolated from the ground. When they are placedat the required height and have the proper length, they can resonate and be muchmore effective for RF emission and protection than a direct connection to the ground.However, this only applies to radio frequencies. They have no protective functionsagainst electric shock from currents with mains frequency, or lightning.2.6 CONNECTING RF CABLES – ADDITIONAL INFORMATIONAll connections between the tuner and the radio station should be executed in the se-quence described below, before the tuner is powered from the amplifier.CAUTIONBefore you start connecting the coaxial cable from the ra-dio station to the tuner, ensure that its two ends are notconnected to anything and take all necessary precautionsthat no one has access to them! Place warning signs atboth ends reading: WARNING! DO NOT TURN ON – PEO-PLE WORKING!a) Before doing anything else, connect the tuner’s grounding terminal.WARNING HIGH VOLTAGEDo not proceed with the installation, unless you have con-nected the tuner grounding terminal marked GROUNDto the lightning protection grounding or the radio stationgrounding system, according to tuner installation location,see S. 1.5.WARNING HIGH VOLTAGEBefore connecting any cable to the tuner, use a voltmeterto make sure there is no AC or DC voltage above 12V fromthe pin of the cable connector to the grounding terminalof the tuner, from the ring of the cable connector to thegrounding terminal of the tuner, and between the connectorpin and ring!b) Assign the antenna numbers (1 to 4) in advance. After verifying that there is no dan-gerous voltage, connect, one at a time, all available antenna cables to the respectiveantenna sockets, ANTENNA 1 to ANTENNA 4 of the tuner, without fastening the con-nector rings at first, so that the cables may still be axially turned and adjusted. |
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