Rhotheta RT-1000 User manual

RT-1000 Multichannel
Maintenance Manual

RT-1000 MC Maintenance Manual
RHOTHETA Page 2 of 20 Maintenance Manual
Edited by:
RHOTHETA Elektronik GmbH
Kemmelpark
Dr.-Ingeborg-Haeckel-Str. 2
82418 Murnau
Germany
Tel.: [phone] - 0
Fax: [phone] - 15
Internet: www.rhotheta.de
E-Mail: [email protected]
Copyright © RHOTHETA Elektronik GmbH
All rights reserved
-Issue: 2016/11/07 [Rev 1.03.a]
-Document-ID: 12-9-1-0015-3-6-60
Note
The manufacturer reserve the right to make modifications at any time and without previous
information of the here described product.

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Content
1 General Information.........................................................................................................4
2 Indoor Tests.....................................................................................................................5
2.1 AC Power Supply....................................................................................................................................5
2.2 DC Power Supply ...................................................................................................................................6
2.3 RF-Splitter...............................................................................................................................................8
2.4 DF-Channels...........................................................................................................................................9
2.4.1 Display and Control Elements ...................................................................................................9
2.4.2 Phase Adjust............................................................................................................................10
2.4.3 Frequency Offset Test.............................................................................................................11
2.4.4 Level Check.............................................................................................................................13
2.4.5 Squelch Check.........................................................................................................................14
2.4.6 Bearing Check .........................................................................................................................15
2.5 System Status Check ...........................................................................................................................16
2.5.1 Status.......................................................................................................................................16
2.5.2 Error and Warning Simulation..................................................................................................16
2.6 UPS Duration Test................................................................................................................................17
3 Outdoor Test..................................................................................................................17
3.1 Bearing Test with Antenna Mast...........................................................................................................18
3.2 Bearing Test without Mast....................................................................................................................19
3.3 Bearing Check with the Tower Signal...................................................................................................19
4 Notes...............................................................................................................................20

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1 General Information
This document represents the maintenance manual of the RT-1000 Multichannel DF-System.
All tests described in this document are recommended to be performed annually in order to
proof the correct functionality of the DF-System.
All tests should be performed by the personnel, which have been educated on the RT-1000
DF-System or have other appropriate knowledge.
Necessary Measurement Equipment:
-RMS Voltmeter
-RF-Generator
-Spectrum Analyzer
-Antenna Modell (RHOTHETA RTM 1501)
-RF Cable min. 1,5m BNC male to BNC male
-2 RF Cable min. 1,5m BNC male to SMB female
-Portable ATC RF-Transmitter with output power of min. 0.5 W
Applicable Documents:
-User Manual
-System Connection Plan
Note 1:
All connector names refer to the system connection plan, which is delivered with the DF-
System.
Note 2:
All used measurement equipment should be calibrated and have not expired date of
calibration.

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2 Indoor Tests
2.1 AC Power Supply
Test procedure:
Measure the input supply voltage in the supply socket with a RMS Voltmeter.
TC.Nr. TC. Name Test point Limits Result Passed
[TC 010.10] AC Supply Input (UPS) Supply
Socket 230V
rms
±15% OK
Measurement
Equipment: RMS Voltmeter
Test procedure:
Switch ON
the main supply switch S1 and measure the 230V
AC,rms
at the internal connection
panel from X80 to X90 with the RMS Voltmeter.
TC.Nr. TC. Name Test point Limits Result Passed
[TC 010.30] AC Supply
Internal Connection Panel X80-X90 230V
rms
±15% OK
Measurement
Equipment: RMS Voltmeter
Test procedure:
Switch on the UPS if a UPS is installed.
Measure the voltage from X1 to X2 with the RMS Voltmeter.
TC.Nr. TC. Name Test point Limits Result Passed
[TC 010.20] AC Supply
With input Supply X1, X2 230V
rms
±15% OK
Measurement
Equipment: RMS Voltmeter

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2.2 DC Power Supply
Test procedure:
Switch on the DC Power Supply (KEPCO-POWER-SUPPLY +5 V, +15V, -15V).
Measure the DC Voltage on DC Power Supply’s front panel test points with a RMS Voltmeter.
TC.Nr. TC. Name Test point Limits Result Passed
[TC 020.11] DF-Channel DC Supply
DC Power Supply (KEPCO 5 V)
+Test Points-
(KEPCO
Front panel) 5,0…5,25 V
DC
OK
[TC 020.12] DF-Channel DC Supply
DC Power Supply (KEPCO 15 V)
+Test Points-
(KEPCO
Front panel) 14,75…15,25 V
DC
OK
[TC 020.13] DF-Channel DC Supply
DC Power Supply (KEPCO 15 V)
+Test Points-
(KEPCO
Front panel) 14,75…15,25 V
DC
OK
[TC 020.14] DF-Channel DC Supply
DC Power Supply (KEPCO 15 V)
+Test Points-
(KEPCO
Front panel) 14,75…15,25 V
DC
OK
Measurement
Equipment: RMS Voltmeter

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Test procedure:
Measure the DC Voltage with a RMS Voltmeter on one of the DF-Channels from TP16 to GND,
TP15 to GND, TP14 to GND
TC.Nr. TC. Name Test
point Limits Result Passed
[TC 020.20]
DF-Channel 1
+5 V TP16 +5,0…+5,25 V
DC
OK
[TC 020.21] +15 V TP15 +14,75…+15,25 V
DC
OK
[TC 020.22] -15 V TP14 -14,75…-15,25 V
DC
OK
[TC 020.23]
DF-Channel 2
+5 V TP16 +5,0…+5,25 V
DC
OK
[TC 020.24] +15 V TP15 +14,75…+15,25 V
DC
OK
[TC 020.25] -15 V TP14 -14,75…-15,25 V
DC
OK
[TC 020.26]
DF-Channel 3
+5 V TP16 +5,0…+5,25 V
DC
OK
[TC 020.27] +15 V TP15 +14,75…+15,25 V
DC
OK
[TC 020.28] -15 V TP14 -14,75…-15,25 V
DC
OK
[TC 020.29]
DF-Channel 4
+5 V TP16 +5,0…+5,25 V
DC
OK
[TC 020.30] +15 V TP15 +14,75…+15,25 V
DC
OK
[TC 020.31] -15 V TP14 -14,75…-15,25 V
DC
OK
[TC 020.32]
DF-Channel 5
+5 V TP16 +5,0…+5,25 V
DC
OK
[TC 020.33] +15 V TP15 +14,75…+15,25 V
DC
OK
[TC 020.34] -15 V TP14 -14,75…-15,25 V
DC
OK
[TC 020.35]
DF-Channel 6
+5 V TP16 +5,0…+5,25 V
DC
OK
[TC 020.36] +15 V TP15 +14,75…+15,25 V
DC
OK
[TC 020.37] -15 V TP14 -14,75…-15,25 V
DC
OK
[TC 020.38]
DF-Channel 7
+5 V TP16 +5,0…+5,25 V
DC
OK
[TC 020.39] +15 V TP15 +14,75…+15,25 V
DC
OK
[TC 020.40] -15 V TP14 -14,75…-15,25 V
DC
OK
[TC 020.41]
DF-Channel 8
+5 V TP16 +5,0…+5,25 V
DC
OK
[TC 020.42] +15 V TP15 +14,75…+15,25 V
DC
OK
[TC 020.43] -15 V TP14 -14,75…-15,25 V
DC
OK
Measurement
Equipment: RMS Voltmeter

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2.3 RF-Splitter
Test procedure:
Disconnect the DF-Antenna from RF-IN on connector panel (see: General System Description,
Chapter: Connector Panel).
Connect 50Ωload to RF-IN on connector panel.
Measure the attenuation of RF-Splitter:
Connect the RF-Generator (Level 0 dBm) to the input TEST-IN of RF-Splitter and measure the
output levels at LNA1-OUT and LNA2-OUT.
Spectrum Analyzer setup: SPAN: 10 MHz, RBW: 3kHz, Ref. Level: 0dBm
TC.Nr. TC. Name Test point Limits Result Passed Not
Supplied
Single LNA (No Redundancy)
[TC 030.10] 118 MHz TEST-IN 
LNA1-OUT -17,5 dBm ±1,5 dB OK
[TC 030.11] 174 MHz TEST-IN 
LNA1-OUT -17,5 dBm ±1.5 dB OK
[TC 030.12] 100 MHz TEST-IN 
LNA1-OUT ≤- 30 dBm OK
[TC 030.13] 190 MHz TEST-IN 
LNA1-OUT ≤- 60 dBm OK
Double LNA (Redundancy)
[TC 030.20] 118 MHz
TEST-IN 
LNA1-OUT -21 dBm ±1,5 dB OK
[TC 030.21] TEST-IN 
LNA2-OUT OK
[TC 030.22] 174 MHz
TEST-IN 
LNA1-OUT -21 dBm ±1.5 dB OK
[TC 030.23] TEST-IN 
LNA2-OUT OK
[TC 030.24] 100 MHz
TEST-IN 
LNA1-OUT ≤- 30 dBm OK
[TC 030.25] TEST-IN 
LNA2-OUT OK
[TC 030.26] 190 MHz
TEST-IN 
LNA1-OUT ≤- 60 dBm OK
[TC 030.27] TEST-IN 
LNA2-OUT OK
Measurement
Equipment: Spectrum Analyzer RF-Generator

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2.4 DF-Channels
2.4.1 Display and Control Elements
Test procedure:
Connect the RF-Generator to the antenna model Input. Connect the antenna model output to
the Test In port of the RF-Splitter. Switch on the RF-Generator.
f = 127.000 MHz, Level = 0 dBm, Modulation AM: 800 Hz, m=60%.
Check the functionality of all control elements at all DF-Channels.
TC.Nr. TC. Name Description Criteria Passed
[TC 040.10] Switch «On/Off» - Position «ON» OK
[TC 040.11] LED «+5V» Supply +5V Green OK
[TC 040.12] LED «+15V» Supply +15V Green OK
[TC 040.13] LED «-15V» Supply -15V Green OK
[TC 040.14] LED «Pow» Control lamp receiver
supply voltage Green OK
[TC 040.15] LED «Sql» Control lamp for
receiver squelch Yellow OK
[TC 040.16] LED «F+, F-» Control lamp,
frequency offset LED is off OK
[TC 040.17] LED «No Sync» Control lamp for error
in receiver LED is off OK
[TC 040.18] Display «Frequency
(MHz)» Frequency (MHz) indication Frequency indicated OK
[TC 040.19] Switch «Local/Remote» Switch for
Local/Remote Mode Local and Remote Mode switched OK
[TC 040.20] Button «Band» Switch for ATC band
and Marine band ATC band and Marine band switched OK
[TC 040.21] Switch
«Level/Frequency/QDR»
Switch for Input RX
Level and QDR
(Switch is not fixed)
Input RX Level and QDR
Switched OK
[TC 040.22] Button «↑,↓» Buttons for frequency
change in local mode Frequency changed OK
[TC 040.23] Bearing indication on
Display (*) - With a bearing signal is « * » displayed OK
[TC 040.24] Sync (o.k , Err.) Synchronizations LEDs of the control
signals
Green OK
[TC 040.25] Audio Check the audio output at the
loudspeaker
The audio tone of 800 Hz
should be audible OK
Measurement
Equipment: RF-Generator Antenna Model

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2.4.2 Phase Adjust
Test procedure:
Connect the antenna model to the RF-IN of the RF-Splitter.
Connect the RF-Generator with 127.000 MHz and with a level of -7 dBm at the antenna model
RF input. Adjust the receiver to the 127.000 MHz. Switch the Antennal Model to 000°
(QDM 180°).
Phase adjustment can be set using the two rotary switches, "fine" and "coarse". Use these
rotary switches and find the middle of the range where the green control lamp lights up. The
QDM display should then show 180° (QDM).
TC.Nr. TC. Name Test point Result Passed Not
Supplied
[TC 040.30] Phase Adjust
DF-Channel 1
Phase Adj.
OK
LED Green
coarse: OK
fine:
[TC 040.31] Phase Adjust
DF-Channel 2
Phase Adj.
OK
LED Green
coarse: OK
fine:
[TC 040.32] Phase Adjust
DF-Channel 3
Phase Adj.
OK
LED Green
coarse: OK
fine:
[TC 040.33] Phase Adjust
DF-Channel 4
Phase Adj.
OK
LED Green
coarse: OK
fine:
[TC 040.34] Phase Adjust
DF-Channel 5
Phase Adj.
OK
LED Green
coarse: OK
fine:
[TC 040.35] Phase Adjust
DF-Channel 6
Phase Adj.
OK
LED Green
coarse: OK
fine:
[TC 040.36] Phase Adjust
DF-Channel 7
Phase Adj.
OK
LED Green
coarse: OK
fine:
[TC 040.37] Phase Adjust
DF-Channel 8
Phase Adj.
OK
LED Green
coarse: OK
fine:
Measurement
Equipment: RF-Generator Antenna Model

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2.4.3 Frequency Offset Test
25 kHz Channel Spacing
Test procedure:
Connect signal generator to RF-Splitter TEST-IN. Change Frequency ±10 kHz
Control LED «F+, F-» on one of the DF-Channels.
Frequency: 127,000 MHz
Level: -60 dBm
Modulation: off
TC.Nr. TC. Name Criteria Passed Not
Supplied
[TC 040.40] DF-Channel 1 127,010 MHz «∆f+» LED on OK
[TC 040.41] 126,990 MHz «∆f-» LED on OK
[TC 040.42] DF-Channel 2 127,010 MHz «∆f+» LED on OK
[TC 040.43] 126,990 MHz «∆f-» LED on OK
[TC 040.44] DF-Channel 3 127,010 MHz «∆f+» LED on OK
[TC 040.45] 126,990 MHz «∆f-» LED on OK
[TC 040.46] DF-Channel 4 127,010 MHz «∆f+» LED on OK
[TC 040.47] 126,990 MHz «∆f-» LED on OK
[TC 040.48] DF-Channel 5 127,010 MHz «∆f+» LED on OK
[TC 040.49] 126,990 MHz «∆f-» LED on OK
[TC 040.50] DF-Channel 6 127,010 MHz «∆f+» LED on OK
[TC 040.51] 126,990 MHz «∆f-» LED on OK
[TC 040.52] DF-Channel 7 127,010 MHz «∆f+» LED on OK
[TC 040.53] 126,990 MHz «∆f-» LED on OK
[TC 040.54] DF-Channel 8 127,010 MHz «∆f+» LED on OK
[TC 040.55] 126,990 MHz «∆f-» LED on OK
Measurement
Equipment: RF-Generator

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8.33 kHz Channel Spacing
Test procedure:
Connect signal generator to RF-Splitter TEST-IN. Change Frequency ±4 kHz
Control LED «∆f+», «∆f-» on one of the DF-Channels.
Frequency: 127,005 MHz
Level: -60 dBm
Modulation: off
TC.Nr. TC. Name Criteria Passed Not
Supplied
[TC 040.60] DF-Channel 1 127,004 MHz «∆f+» LED on OK
[TC 040.61] 126,996 MHz «∆f-» LED on OK
[TC 040.62] DF-Channel 2 127,004 MHz «∆f+» LED on OK
[TC 040.63] 126,996 MHz «∆f-» LED on OK
[TC 040.64] DF-Channel 3 127,004 MHz «∆f+» LED on OK
[TC 040.65] 126,996 MHz «∆f-» LED on OK
[TC 040.66] DF-Channel 4 127,004 MHz «∆f+» LED on OK
[TC 040.67] 126,996 MHz «∆f-» LED on OK
[TC 040.68] DF-Channel 5 127,004 MHz «∆f+» LED on OK
[TC 040.69] 126,996 MHz «∆f-» LED on OK
[TC 040.70] DF-Channel 6 127,004 MHz «∆f+» LED on OK
[TC 040.71] 126,996 MHz «∆f-» LED on OK
[TC 040.72] DF-Channel 7 127,004 MHz «∆f+» LED on OK
[TC 040.73] 126,996 MHz «∆f-» LED on OK
[TC 040.74] DF-Channel 8 127,004 MHz «∆f+» LED on OK
[TC 040.75] 126,996 MHz «∆f-» LED on OK
Measurement
Equipment: RF-Generator

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2.4.4 Level Check
Test procedure:
Connect the RF-Generator to the TEST-IN of the RF-Splitter. Set RF-Generator output to
appropriate level (see column Criteria).
Check dBm level displayed on DF Commander.
Also check % level displayed on DF Commander.
Test all DF-Channels.
TC.Nr. TC. Name Criteria Result
DF-Channel
1 2 3 4 5 6 7 8
[TC 040.80] -100 dBm -120 dBm ± 6 dB
32% ± 8%
[TC 040.81] -90 dBm -110 dBm ± 6 dB
42 ± 8%
[TC 040.82] -80 dBm -100 dBm ± 6 dB
55 ± 8%
[TC 040.83] -70 dBm -90 dBm ± 6 dB
68 ± 8%
[TC 040.84] -60 dBm -80 dBm ± 6 dB
80 ± 8%
[TC 040.85] -50 dBm -70 ± 6 dB
92 ± 8%
[TC 040.86] -30 dBm “> -63 dBm”
99%
Passed
OK OK OK OK OK OK OK OK
Not Supplied
Measurement
Equipment: RF-Generator

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2.4.5 Squelch Check
Test procedure:
Set Squelch Level (SQ) of DF-Channels to 50%.
Connect the RF-Generator to the TEST-IN of the RF-Splitter. Set RF-Generator output level to
-80 dBm at the desired cannel frequency of DF-Channel.
The SQ LED on DF-Channel shell light up.
Test all DF-Channels.
TC.Nr. TC. Name Criteria Passed Not
Supplied
[TC 040.90] SQ level
DF-Channel 1 LED «Sql» is ON OK
[TC 040.91] SQ level
DF-Channel 2 LED «Sql» is ON OK
[TC 040.92] SQ level
DF-Channel 3 LED «Sql» is ON OK
[TC 040.93] SQ level
DF-Channel 4 LED «Sql» is ON OK
[TC 040.94] SQ level
DF-Channel 5 LED «Sql» is ON OK
[TC 040.95] SQ level
DF-Channel 6 LED «Sql» is ON OK
[TC 040.96] SQ level
DF-Channel 7 LED «Sql» is ON OK
[TC 040.97] SQ level
DF-Channel 8 LED «Sql» is ON OK
Measurement
Equipment: RF-Generator

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2.4.6 Bearing Check
Test procedure:
Connect the RF-Generator to the input of antenna model. Connect the output of the antenna
model to the TEST-IN port of the RF-Splitter and switch ON the RF-Generator.
f = 127,000 MHz, Level = -10 dBm Modulation off. Control the displayed bearing at the DF
Commander at Main Bearing Page for each channel.
TC.Nr. TC. Name Test point Limits Result Passed Not
Supplied
[TC 041.10] Bearing Check
DF-Channel 1
0° ±3°
OK
90° ±3°
180° ±3°
270° ±3°
[TC 041.11] Bearing Check
DF-Channel 2
0° ±3°
OK
90° ±3°
180° ±3°
270° ±3°
[TC 041.12] Bearing Check
DF-Channel 3
0° ±3°
OK
90° ±3°
180° ±3°
270° ±3°
[TC 041.13] Bearing Check
DF-Channel 4
0° ±3°
OK
90° ±3°
180° ±3°
270° ±3°
[TC 041.14] Bearing Check
DF-Channel 5
0° ±3°
OK
90° ±3°
180° ±3°
270° ±3°
[TC 041.15] Bearing Check
DF-Channel 6
0° ±3°
OK
90° ±3°
180° ±3°
270° ±3°
[TC 041.16] Bearing Check
DF-Channel 7
0° ±3°
OK
90° ±3°
180° ±3°
270° ±3°
[TC 041.17] Bearing Check
DF-Channel 8
0° ±3°
OK
90° ±3°
180° ±3°
270° ±3°
Measurement
Equipment: RF-Generator Antenna Model

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2.5 System Status Check
2.5.1 Status
Test procedure:
Check the appearance of Errors and Warnings on the Channel Status Indicator (see Manual).
There should be no Errors and Warnings displayed (all indicator must be green).
TC.Nr. TC. Name Test point Criteria Passed Not
Supplied
[TC 050.10] Errors and Warnings
DF-Channel 1 DF-Channel 1 No Errors and Warnings OK
[TC 050.11] Errors and Warnings
DF-Channel 2 DF-Channel 2 No Errors and Warnings OK
[TC 050.12] Errors and Warnings
DF-Channel 3 DF-Channel 3 No Errors and Warnings OK
[TC 050.13] Errors and Warnings
DF-Channel 4 DF-Channel 4 No Errors and Warnings OK
[TC 050.14] Errors and Warnings
DF-Channel 5 DF-Channel 5 No Errors and Warnings OK
[TC 050.15] Errors and Warnings
DF-Channel 6 DF-Channel 6 No Errors and Warnings OK
[TC 050.16] Errors and Warnings
DF-Channel 7 DF-Channel 7 No Errors and Warnings OK
[TC 050.17] Errors and Warnings
DF-Channel 8 DF-Channel 8 No Errors and Warnings OK
2.5.2 Error and Warning Simulation
Test procedure:
Check Errors and Warnings on Channel Status Indicator (see Manual).
TC.Nr. TC. Name Description Criteria Passed
[TC 050.20] DF-Channel Off Turn off DF-Channel Error must be displayed OK
[TC 050.21] DF-Channel in Local
Mode Switch one of DF-Channels to local mode Error must be displayed OK
[TC 050.22] Frequency offset Connect signal generator to RF Splitter TEST-IN.
Change Frequency ±10 kHz
Warning be displayed OK

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2.6 UPS Duration Test
Test procedure:
Turn off input supply from UPS.
The System has to work 30 minutes without Errors.
After test turn UPS input supply ON.
TC.Nr. TC. Name Passed Not
Supplied
[TC 060.10] 30 minutes operation from UPS OK
Measurement
Equipment: Stopwatch
3 Outdoor Test
The outdoor test is the test of bearing accuracy of the system inclusive the antenna and the
installation position or area. Please note that due to the installation area or changes of
installation area (e.g. new metal reflectors on the field) the bearing results may vary from the
performance showed at factory acceptance test. Note that the system performance which was
shown at factory acceptance test did not cover the influence of installation area and hence
provided the true bearing performance of the direction finder.

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3.1 Bearing Test with Antenna Mast
Test procedure:
1. Please define the position on the field, where the bearing is known. The distance
should be at least 100m.
2. Go to the defined position and switch on the radio transmitter on the appropriate test
frequency.
3. Write down the bearing result.
4. Turn the rotating mechanism of the antenna mast in one step and transmit again with
the ATC radio device. Write down the bearing result. One step corresponds exactly to
10°, so bearing result should have been changed in 10° also.
5. Repeat this procedure with 10° steps until the full circle of 360° has been measured.
TC.Nr. TC. Name Limits Result Passed
[TC 060.10] 0° Measurement 0° ±3° OK
[TC 060.11] 10° Measurement 10° ±3° OK
[TC 060.12] 20° Measurement 20° ±3° OK
[TC 060.13] 30° Measurement 30° ±3° OK
[TC 060.14] 40° Measurement 40° ±3° OK
[TC 060.15] 50° Measurement 50° ±3° OK
[TC 060.16] 60° Measurement 60° ±3° OK
[TC 060.17] 70° Measurement 70° ±3° OK
[TC 060.18] 80° Measurement 80° ±3° OK
[TC 060.19] 90° Measurement 90° ±3° OK
[TC 060.20] 100° Measurement 100° ±3° OK
[TC 060.21] 110° Measurement 110° ±3° OK
[TC 060.22] 120° Measurement 120° ±3° OK
[TC 060.23] 130° Measurement 130° ±3° OK
[TC 060.24] 140° Measurement 140° ±3° OK
[TC 060.25] 150° Measurement 150° ±3° OK
[TC 060.26] 160° Measurement 160° ±3° OK
[TC 060.27] 170° Measurement 170° ±3° OK
[TC 060.28] 180° Measurement 180° ±3° OK
[TC 060.29] 190° Measurement 190° ±3° OK
[TC 060.30] 200° Measurement 200° ±3° OK
[TC 060.31] 210° Measurement 210° ±3° OK
[TC 060.32] 220° Measurement 220° ±3° OK
[TC 060.33] 230° Measurement 230° ±3° OK
[TC 060.34] 240° Measurement 240° ±3° OK
[TC 060.35] 250° Measurement 250° ±3° OK
[TC 060.36] 260° Measurement 260° ±3° OK
[TC 060.37] 270° Measurement 270° ±3° OK
[TC 060.38] 280° Measurement 280° ±3° OK
[TC 060.39] 290° Measurement 290° ±3° OK
[TC 060.40] 300° Measurement 300° ±3° OK
[TC 060.41] 310° Measurement 310° ±3° OK
[TC 060.42] 320° Measurement 320° ±3° OK
[TC 060.43] 330° Measurement 330° ±3° OK
[TC 060.44] 340° Measurement 340° ±3° OK
[TC 060.45] 350° Measurement 350° ±3° OK
[TC 060.46] 360° Measurement 360° ±3° OK
Measurement
Equipment: Mobile Transmitter

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3.2 Bearing Test without Mast
Test procedure:
1. Please define more than one position, where the bearing is known.
2. Go to the defined position and switch on the radio transmitter on the appropriate test
frequency.
3. Write down the bearing result. The bearing result should correspond to the known
bearing.
4. Repeat this procedure with all defined positions on a field.
TC.Nr. TC. Name Limits Result Passed
[TC 070.10] Position 1 0° ±3° OK
[TC 070.11] Position 2 OK
[TC 070.12] Position 3 OK
[TC 070.13] Position 4 OK
[TC 070.14] Position 5 OK
[TC 070.15] Position 6 OK
[TC 070.16] Position 7 OK
[TC 070.17] Position 8 OK
Measurement
Equipment: Mobile Transmitter
3.3 Bearing Check with the Tower Signal
Test procedure:
The bearing value on a tower is normally defined. If not, so please do so. Hence, the bearing on
a tower transmitter is a simple check of the system, which can be done many times without
extra preparation.
TC.Nr. TC. Name Limits Result Passed
[TC 080.10] Tower Bearing Tower Bearing ±3° OK
Measurement
Equipment: Mobile Transmitter

RT-1000 MC Maintenance Manual
RHOTHETA Page 20 of 20 Maintenance Manual
4 Notes