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NORMARC 7050 Manual

Marker beacon
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NORMARC 7050
MARKER BEACON
Transmitter
©1999 Navia Aviation AS

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Summary of Contents for NORMARC 7050

  • Page 1 NORMARC 7050 MARKER BEACON Transmitter ©1999 Navia Aviation AS...
  • Page 2 ©1999 Navia Aviation AS...

  • Page 3: Transmitter Description

    NORMARC 7050 TRANSMITTER MARKER BEACON TRANSMITTER DESCRIPTION TX 1373A Transmitter General Description TX 1373A is a module designed to transmit Marker Beacon signals. An on board oscillator working at 75 MHz provides an output of app.0 dBm that is used as input to the Power Ampli- fier (PA).

  • Page 4: Automatic Gain Control

    TRANSMITTER NORMARC 7050 MARKER BEACON (See block diagram Figure1-1) From Description IOD[7:0] MO 1374 Parellel data bus for communication between TX 1/2, CI and MO1 ~TXCS MO 1374 Transmitter card select ~TXWR MO 1374 Write strobe for IO bus ~TXRD...

  • Page 5: Power Amplifier

    NORMARC 7050 TRANSMITTER MARKER BEACON PA after being amplified, while part of it is fed back to the other port of the MOSFET. The transistor detects the difference between these two signals and increases or decreases the signal out to the PA, depending on the signal levels from the oscillator.
  • Page 6 TRANSMITTER NORMARC 7050 MARKER BEACON inputs to the FPGA are the strapped signals used to select outer, middle, inner or FAN marker frequency, as well as status signals regarding oscillator, RF- and LF-level output. Communi- cation with the FPGA is done by the IOD[7:0], ~TXRD and ~TXWR signals. Multiplying DAC’s are used to adjust RF level and modulation depth.
  • Page 7 NORMARC 7050 TRANSMITTER MARKER BEACON Schematics ©1999 Navia Aviation AS 21464-5 TX 1373A Transmitter...
  • Page 18 TRANSMITTER NORMARC 7050 MARKER BEACON Photos TX 1373A Transmitter 21464-5 ©1999 Navia Aviation AS...

  • Page 21: Tests And Adjustments

    NORMARC 7050 TRANSMITTER MARKER BEACON Tests and adjustments Preparations Terminate the RF OUT terminal with a 50Ω load (antenna or dummy). The transmitters are factory adjusted to 2 watt output power. Let both transmitters run for ½ hour at this power to achieve a stable working temperature before any fine tuning is carried out.
  • Page 22 Table 2-1 MB Configuration settings S1 and S3 will decide the model (NM 7050 A, B, C or D) and show up in the Link Status win- dow in the RMM program and the Initial Window in the LCD menu. A disagreement between...

  • Page 23: Adjustment Points

    NORMARC 7050 TRANSMITTER MARKER BEACON Figure 2-2 shows where the straps are located on the transmitter board(s). TX 1373 HBK798/1 Figure 2-2 Location of Marker Beacon type straps on transmitter board Adjustment points The adjustment points are shown in Figure 2-3 and explained below. The figure shows a fully equipped system, NM 7050D, see chapter 3 for configuration details: 1.

  • Page 24: Adjustments At Installation

    USER MANUAL NORMARC 7050 MARKER BEACON 1. Monitor RF level (nom. 3V@nominal output power) 1. Monitor frontend input filter centre frequency (use factory settings) 2. Real time clock fine tuning(use factory settings) The adjustment points marked Use Factory Settings should not be touched.
  • Page 25 NORMARC 7050 TRANSMITTER MARKER BEACON • Set L mode with the R switch. OCAL EMOTE OCAL • Set M mode with the A switch. ANUAL ANUAL • Set TX1 to air with the C button HANGEOVER • Adjust RF in TX settings until you read the desired output power on RF...
  • Page 26 USER MANUAL NORMARC 7050 MARKER BEACON Figure 2-4 The TX settings view ALTERING VIEWS • You may select between TX1 and TX2 by clicking the TX1 or TX2 tabs. • You may select transmitter set-up by clicking the N 1 or T 2 tabs.
  • Page 27 NORMARC 7050 TRANSMITTER MARKER BEACON The RF (output power) is adjusted by dragging the RF knob. The value in volts in LEVEL LEVEL the window to the right shows the control voltage to the power amplifier. If you want a power indication in Watts, open the maintenance window and watch the CarrierPower parameter for the selected TX1373.
  • Page 28 USER MANUAL NORMARC 7050 MARKER BEACON Figure 2-9 Fan marker keying programming. Note that the Fan Marker settings are available only when the transmitter are configured as Fan Marker. Tests and adjustments 21464-5 ©1999 Navia Aviation AS 2-16...

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