Tait TB8100 Installation Manual

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Tait TB8100 Installation Manual Manual pdf 21 page image

TB8100 Installation Guide Connection 21© Tait Electronics Limited February 2007The DC output from the PMU is 13.65VDC, 27.3VDC, or 54.6VDC(depending on the model). Although this power output is isolated, thenegative side of the supply is grounded on the system interface board to givea +V output.2.2 RF ConnectionsImportant The PA may be damaged if the load is removed or switchedwhile the PA is transmitting. Refer to “Antenna Load” onpage 6 of the Installation and Operation Manual for moredetails.We recommend that you use dual-screened coaxial cable such as RG223 forthe BNC/TNC connections, and RG214 for the N-type connections.When the base station is used in simplex mode using a single antenna witha coaxial changeover relay, the isolation of this relay must be ≥40dB.2.3 System Control BusImportant In base stations which use a PMU, the PMU must be con-nected to the system control bus at all times. The I2 C cur-rent source is located in the PMU, and if the PMU is dis-connected, the state of much of the bus will be undefined.This may cause corrupted data to be present on the buswhen the reciter reads the states of the switches on the con-trol panel. This in turn may result in random actuations ofmicrophone PTT, carrier, or speaker key, causing the basestation to transmit or the speaker to be actuated incorrectly.Pin Description Links1 +V input2 ground3 +V input4 ground2-way connector - external view1234124-way connector - external view