Nautel NX100 Preinstallation Manual

Also see for NX100: Installation manual Manual Troubleshooting manual Manual

Nautel NX100 Preinstallation Manual Manual pdf 73 page image

NX100 Pre-installation Manual Planning control/monitor connectionsPage 8-4 Issue 3.2 2017-03-31External PDM inhibitYou can connect an external PDM inhibit to terminal block TB1 (terminals 5 through 8) of thecontrol/interface PWB (A11A1), located on the exciter panel behind the front door. This connectionallows you to configure an external PDM inhibit circuit that provides an emergency RF inhibitcontrol for the NX100. This circuit can be configured as single-ended or differential, using user-provided shorting jumpers on terminal block TB1 (see Figure 8.1).Single Ended Input (Internal dc supply). If you are using the transmitter's 15 V as the currentsource for the PDM inhibit circuit, install a shorting jumper between the +15V terminal (TB1-5) andthe + terminal (TB1-6) and connect your external PDM inhibit circuit between the GND terminal(TB1-8) and the – terminal (TB1-7).The external PDM inhibit circuit must present a short circuit (low impedance) between TB1-8 andTB1-7 when the RF output requires inhibition. It must present an open circuit for normal operation.Differential Input (External dc supply). If you are using an external dc supply (capable ofproviding between 12 V and 25 V) as the current source for the external PDM inhibit circuit, connectthe supply’s positive output to the + terminal (TB1-6) and the supply’s ground (negative) output tothe – terminal (TB1-7), via the external PDM inhibit circuit. No shorting jumper is required.The external PDM inhibit circuit must present a short circuit (low impedance) between TB1-8 andTB1-7 when the RF output requires inhibition. It must present an open circuit for normal operation.