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NORMARC 7050, Manual

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NORMARC 7050 Manual Download Page 23

©1999 Navia Aviation AS

21464-5

Tests and adjustments

TRANSMITTER

NORMARC 7050

MARKER BEACON

2-11

Figure 2-2 shows where the straps are located on the transmitter board(s).

.

Figure 2-2 Location of  Marker Beacon type straps on transmitter board

2.3

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. Battery charging voltage (nom 27.4V@20

°

C)

1. Bias for power transistor (use factory settings)
1. Battery protection cut-off voltage (nom. 22V)
1. Tx Detected  Rf level (nom. 2.5V@4W carrier)

S1

S2

S3

S4

TX 1373

HBK798/1

Summary of Contents for 7050

Page 1: ... 1999 Navia Aviation AS NORMARC 7050 MARKER BEACON Transmitter ...

Page 2: ... 1999 Navia Aviation AS ...

Page 3: ... by a lowpass filter after the PA Part of the signal out of the PA is tapped off to be demodulated and used for feedback and self test purposes Demod ulation is done by a mixer with a linear detector The audio signals are generated in the LF circuitry mainly by a Field Programmable Gate Array FPGA Inner Middle or Outer Marker is selected by straps 1 1 1 Block diagram Figure 1 1 TX1373 Block diagra...

Page 4: ...om the oscillator to the PA The sig nal from the oscillator is fed to one of the ports of a dual gate MOSFET The signal enters the In 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 MO 1374 Read strobe for IO bus TX_ADR CI 1376 Transmitter select TX_ON MO 1374 Transmitter o...

Page 5: ...0VDC drain voltage After amplification the peak power will be 43 dBm with a dynamic range of 75 80 dB The TX is capable of delivering 4W carrier power Signals in 75 MHz RF from oscillator AGC Modulation voltages up to 12VDC Power Supply 20 VDC Bias 0 5 V to power stage Signals out RF to detector LP Filter LOW PASS FILTER The output signal from the PA is filtered to remove harmonic frequencies The ...

Page 6: ...s as well as the ON OFF signal from the AGC and the detected signal from the PA MAINTENANCE MONITOR CIRCUITRY The purpose of the onboard monitor circuitry is to give the Monitor card MO 1374 information about the status of the transmitter The AMUX_ADR 3 0 from the MO 1374 is applied to the analogue multiplexer These four lines select one of sixteen possible signals to be measured The signals measu...

Page 7: ... 1999 Navia Aviation AS 21464 5 TX 1373A Transmitter TRANSMITTER NORMARC 7050 MARKER BEACON 1 7 1 2 Schematics ...

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Page 18: ...TRANSMITTER 1 8 21464 5 NORMARC 7050 MARKER BEACON TX 1373A Transmitter 1999 Navia Aviation AS 1 3 Photos ...

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Page 21: ... Marker Beacon according to desired sys tem configuration 2 2 1 General Configuration The static control strap on the Connection interface board sets hardware configuration remote access configuration and shutdown configuration Figure 2 1 shows where the static control strap is located on CI 1376 Figure 2 1 Location of Static Control Strap on CI 1376 Set the configuration for the MB according to T...

Page 22: ...are available on the RMM local port regardless of S6 and S7 2 2 2 Setting inner outer or middle marker To configure the beacon for outer middle or inner marker set the straps S1 S4 on the trans mitter board s according to Table 2 2 Table 2 2 Marker function configuration Strap no State Function S1 Strap IN 2 power supplies NM 7050 B D Strap OUT 1 power supply NM 7050 A C S2 Strap IN Access Grant d...

Page 23: ... straps on transmitter board 2 3 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 Battery charging voltage nom 27 4V 20 C 1 Bias for power transistor use factory settings 1 Battery protection cut off voltage nom 22V 1 Tx Detected Rf level nom 2 5V 4W carrier S1 S2 S3 S4 TX...

Page 24: ...ent is most easily done with the RMM PC program but the local keyboard display may be used Make sure the output signal RF OUT is terminated with a 50Ω load antenna or dummy load If this is an Inner Marker make sure the external attenuator is installed Start the RMM program on the PC see chapter 10 Open the TX settings window RF LEVEL for TX1 and TX2 are to be adjusted Open the Maintenance window R...

Page 25: ...is procedure The software adjust ments are most easily done with the RMM program but may be carried out from the front panel Connect a reference wattmeter to the output signal RF OUT Set TX1 to air Watch the maintenance parameter CARRIER POWER Adjust the TX settings parameter RF LEVEL until the watt meter shows 2W Check that the Maintenance parameter CARRIER POWER on TX1 is accurate to within 5 If...

Page 26: ...y select transmitter set up by clicking the NORMAL TEST1 or TEST2 tabs Figure 2 5 Selecting test settings You may choose between three pre set transmitter settings by clicking the USE NORMAL USE TEST 1 or USE TEST 2 buttons Figure 2 6 Adjusting the RF level ΤNote that when leaving access level 2 3 the Normal set up will be loaded into the transmitters This is also the case when turning the transmi...

Page 27: ...C that is used to feed the modulation circuitry in the transmitter Figure 2 8 Setting keying type There are three possible keying alternatives NORMAL CONTINUOS and OFF the two latter used for test or maintenance purposes FAN MARKER If the station is configured as a FAN MARKER the keying may be set quite freely Each of the 24 Data boxes corresponds to one tick which endures for approximately 150ms ...

Page 28: ...464 5 NORMARC 7050 MARKER BEACON Tests and adjustments 1999 Navia Aviation AS Figure 2 9 Fan marker keying programming Note that the Fan Marker settings are available only when the transmitter are configured as Fan Marker ...

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