Nautel V10 User's Installation And Operation Manual

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Nautel V10 User's Installation And Operation Manual Manual pdf 32 page image

Page 2-8 V10/V7.5/V5/V3.5 Installation and Operation ManualIssue 3.5 Section 2 Preparation for Use and Installation2.2.9.2 Power ConsumptionPower consumption varies depending onthe transmitter’s mode of operation(analog/hybrid/all-digital). If the transmitterconfiguration is a dedicated analog,hybrid, or all-digital transmitter, use Table2-2 to determine the actual input powerrequirements. If the transmitterconfiguration is variable (between allmodes), use the analog (FM mode) powersource capacity information. Nautelrecommends using the highest currentvalues (FM mode) when determining wireratings.Nautel recommends the ac power sourcehave a 25% over-capacity to ensureadequate regulation.2.2.9.3 External Ac SwitchingAll current carrying conductors from the acpower source must be controlled by anexternal switching box located in closeproximity to the transmitter. This switchbox should be clearly markedTRANSMITTER EMERGENCY ON/OFFSWITCH. See Table 2-2 for current ratingsand suggestions that should aid inselecting a circuit breaker and associatedinput wiring.2.2.10 Antenna SystemThe antenna system must present50 ± j0 Ω impedance at the carrierfrequency. The transmitter will functionwhile operating into a maximum VSWR of1.5:1, but overall system performance willbe degraded. Circuitry within thetransmitter will prevent damage to thetransmitter from high VSWR loads.2.2.10.1 RF Feed CableThe RF feed cable interconnecting thetransmitter and the antenna systemshould be a suitably rated coaxial cable.As a standard, the RF output is configuredto accept a non-gas type 3-1/8 inch(V10/V7.5) or 1-5/8 inch (V5/V3.5) EIAflange (male) connection (appropriatemale inner connector not provided withthe transmitter). Optional EIA connectionsare available (see below):V10/V7.5: 7/8 or 1-5/8 inch also availableV5/V3.5: 7/8 or 3-1/8 inch also available2.2.11 RF Drive Source(s)The RF drive source type and power leveldepends on the transmitter’s operationalmode (all-digital/hybrid/analog).An exciter (or dual exciters) provides anIBOC (phase modulated OFDM) signaland/or an FM carrier in the 87.5 to108 MHz band.The exciter’s output power should be20 W (10 W) for analog configuredV10/V7.5 (V5/V3.5) transmitters or 10 W(5 W) for digitally configured V10/V7.5(V5/V3.5) transmitters operating in analogmode.The transmitter cabinet accepts one ortwo Nautel FM exciters. Each exciter musthave an external on/off interlock or RFmute capability. The transmitter providesa set of form C contacts on the remoteinterface PWB (A44) for each exciter’s RFmute control. Exciter A’s contacts arebetween TB2-1 and TB2-3 (N/C) or TB2-2and TB2-3 (N/O). Exciter B’s contacts arebetween TB2-4 and TB2-6 (N/C) or TB2-5and TB2-6 (N/O). If the exciter needs anopen on its interlock terminals to not bemuted, connect to N/O (normal operationis open). If the exciter needs a short on itsinterlock terminals to not be muted,connect to N/C (normal operation isclosed).2.2.11.1 Digital (IBOC) OperationFor IBOC operation, the exciter usesExgine technology. An exporter providesthe digital component directly to theexciter via an Ethernet connection; thetransmitter requires no additionalconnection.