Nautel NV15, Руководство по эксплуатации и обслуживанию

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NV15/NV20 Operations and Maintenance Manual Description
Page 1-4 Issue 3.2 2013-10-01
The control/interface PWB contains push-button switches that provide backup control for the RF
on/off, local/remote, power increase/decrease and reset functions.
It also contains LEDs that serve
as an alternate means to monitor status (local/remote and RF on/off), forward power level
(percentage indicators from 10% to 100% of maximum RF output power) and various alarms
.
Figure 1.1: Control/Monitor Stage
RF drive stage
See Figure
SD-6
. The RF drive stage converts the exciter's RF output to the intermediate RF level
needed to drive the RF power modules. It consists of exciter A (A3), exciter B (A4, optional) and RF
drive splitter/changeover assembly (A5).
Exciter(s)
Refer to the functional block diagram: NVE300 Exciter Block Diagram - see page 1-10 .
Exciters A (A3) and B (A4) are the RF drive sources for the transmitter. They accept the external
audio program and/or IBOC information (see the NV15/NV20 Installation Manual for details on
various program input types). The exciters’ main/standby operation is controlled locally using the
AUI, or remotely. The exciter outputs are applied to the RF drive splitter/changeover assembly (A5).
The exciter provides an RF drive signal of 11 W (in analog mode).
RF drive splitter/changeover assembly
The RF drive splitter/changeover assembly (A5) controls the routing of the main and standby
exciters and provides the RF drive signals for the two RF power modules. The assembly is comprised
of the splitter/changeover PWB (A5A1) and the 4-way RF drive splitter/attenuator PWB (A5A2).
From RF Power Stage
From Ac-Dc Power Stage
AUI
To RF Power Stage
To Ac-Dc Power Stage
Control/
Interface
PWB
To RF Drive Stage
From RF Drive Stage
From Remote
Controller
To Remote
Monitor
(part of)
Remote
Interface
PWB
(part of)
Remote
Interface
PWB