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Rhotheta RT-1000 A User Manual

Vhf direction finder system
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RHOTHETA Elektronik GmbH
User Manual RT-1000 A
[Rev 4.00]
User Manual
VHF Direction Finder System
RHOTHETA RT-1000 A

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Summary of Contents for Rhotheta RT-1000 A

  • Page 1 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] User Manual VHF Direction Finder System RHOTHETA RT-1000 A...
  • Page 2 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] Edited by: RHOTHETA Elektronik GmbH Kemmelpark Dr.-Ingeborg-Haeckel-Str. 2 82418 Murnau Germany Tel.: +49 8841 4879 - 0 Fax: +49 8841 4879 - 15 Internet: www.rhotheta.de E-Mail: email@rhotheta.de Copyright © RHOTHETA Elektronik GmbH All rights reserved Issue: 2016/04/26 [Rev 4.00]...

  • Page 3: General Information

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] Section 1 General Information General Description, Characteristics, Flexible System Configuration, Bearing Display and Bearing Quality Analysis, Antenna System, Antenna Mast,Technical Data Section 2 Controller RTC 1100.B Section 3 Not Applicable Section 4 Direction Finder Antenna RTA 1300.A...

  • Page 4: Table Of Contents

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 1 GENERAL INFORMATION List of Contents: 1 GENERAL INFORMATION ............1.1 General Description ..................1.2 1.1.1 Options ..........................1.2 1.1.2 System Configuration .......................1.3 1.1.3 Subsystems ........................1.3 1.1.4 Block Diagram ........................1.4 Technical Data ....................1.5 1.2.1...

  • Page 5: General Description

    User Manual RT-1000 A [Rev 4.00] 1.1 General Description The direction finder system RT-1000 A is designed for ATC (air traffic control) and VTS (vessel traffic service) application. The system can be used in stationary and mobile applications. 1.1.1 Options...

  • Page 6: System Configuration

    They are connected by means of a 6-wire control line and a coaxial RF wire. 1.1.3 Subsystems Subsystems Designation File Reference Part No. RT-1000 A Controller RTC 1100.B 12-9-2-0020-2-1 RTC-1100 B RT-1000 Antenna RTA 1300.A 12-9-2-0019-2-1 RTA-1300 A - 1.3 -...

  • Page 7: Block Diagram

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 1.1.4 Block Diagram - 1.4 -...

  • Page 8: Technical Data

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 1.2 Technical Data 1.2.1 Basic Data Basic Data Parameter Condition Data DF method Doppler (3 kHz rotation frequency) Response time With sufficient signal strength ≤ 500 ms / typ. ≤ 250 ms Minimum signal duration typ.

  • Page 9: Electrical Characteristic

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 1.2.2 Electrical Characteristic 1.2.2.1 System Characteristic System Properties Parameter Condition Limit Typical 118,000 – 136,975 MHz, ≤ 5 µV/m ≤ 2,5 µV/m ±2°bearing fluctuation Bearing sensitivity 156,000 – 174,000 MHz, ≤ 5 µV/m ≤...

  • Page 10: Power Supply

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 1.2.2.2 Power Supply Technical Data Parameter Condition Data 115 / 230 V ±15 %; 47...63 Hz Power supply 24 V -10 % / +20 % Power consumption Controller 15 VA 1.2.2.3...

  • Page 11: Mechanical Characteristics

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 1.2.3 Mechanical characteristics 1.2.3.1 Antenna RTA 1300.A Antenna RTA 1300.A with Antenna Mast RTA 1306.A DF antenna RTA 1300 with lightning rod and mast tube Antenna Mast RTA 1306.A antenna rotator for accuracy test...
  • Page 12 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 1.2.3.2 Controller RTC 1100.B Controller RTC 1100.B Mechanical Characteristis Subsystem Length Width Height Weight RT-1000 Controller RTC 1100.B 482,6 mm 377,7 mm 132,5 mm 9,3 kg The weight is valid for the Controller without remote operation mode...

  • Page 13: Antenna Rta 1300

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 1.2.4 Environmental Conditions 1.2.4.1 Antenna RTA 1300.A Environmental Conditions Parameter Data Wind load 150 km/h / 135 N (with constant wind speed) 180 km/h / 195 N allowed wind speed ≤ 240 km/h Operating temperature range -40°C…+80°C...

  • Page 14: Safety

    The manufacturer assumes no responsibility for the mis- use of the product. The manufacturer is not liable beyond the scope of legal rules! This manual is part of the product RT-1000 A and is to keep during the lifetime and pass on to the product. 1.3.1...

  • Page 15: Basic Safety Note

    Therefore, supply the device to an electronics recycling after the final taken out of service. Otherwise • RHOTHETA Elektronik GmbH takes back all products that are subject to the requirements of the WEEE Directive (2012/19/EU) of the European Union to supply these products to profes- sional disposal.
  • Page 16 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2 CONTROLLER RTC 1100.B List of Contents: 2 CONTROLLER RTC 1100.B ............2.1 Key to Front and Rear Views ................ 2.5 Preparation for Use ..................2.9 2.2.1 Grounding ..........................2.9 2.2.2 Mains Voltage ........................2.9 2.2.3...
  • Page 17 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.3.6.2 Stopping Scanning....................2.27 2.3.7 Direct Recall of the Distress Frequency 121.500 MHz ..........2.27 2.3.8 North Adjustment ......................2.27 2.3.9 Selection of the reference directions QDM, QDR, QUJ und QTE .......2.28 2.3.10 Checking the Variation adjustment ................2.30 2.3.11...
  • Page 18 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] List of Figures: Figure 2-1 Front view .......................... 2.7 Figure 2-2 Rear view ........................... 2.8 Figure 2-3 Mains voltage selector ...................... 2.9 Figure 2-4 Mains power connection, mains fuse holder ..............2.10 Figure 2-5 Variations Adjustment ....................
  • Page 19 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] - 2.4 -...

  • Page 20: Key To Front And Rear Views

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.1 Key to Front and Rear Views All the position numbers refer to operating elements shown in the front and rear views (Figure 2-1 and Figure 2-2). Designation Function see Section...
  • Page 21 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] Designation Function see Section Sync Control indication: synchronisation NOK 2.3.21 Sync Control indication: synchronisation. OK 2.3.21 Test plug R/L signal 2.3.23 DF-Signal 2 DF signal (filtered) 2.3.22 Connection jack for ground transmitter suppression 2.2.14...

  • Page 22: Figure 2-1 Front View

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] Figure 2-1 Front view - 2.7 -...

  • Page 23: Figure 2-2 Rear View

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] Figure 2-2 Rear view - 2.8 -...

  • Page 24: Preparation For Use

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.2 Preparation for Use 2.2.1 Grounding The RTC 1100 Controller housing is earthed by means of the grounding contact in the mains plug. At the rear of the housing there is a M6 grounding screw (35 Fig. 2-2). This should be used to make a low-impedance and low-inductivity connection between the unit and earth potential (system earth).

  • Page 25: Mains Fuse

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] ATTENTION If the mains voltage selector is not set correctly, the unit may be damaged beyond repair. 2.2.3 Mains Fuse The mains fuses are contained in the mains power connection (40, Fig. 2-2). There is a separate fuse for phase and the neutral wire.

  • Page 26: Power Supply

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] Fuse F1 inserted in the fuse holder (20, Fig 2-2) protects the unit during DC operation. Use a IEC 127 T 1.0 A H / 250 V fuse. The supply voltage range for DC voltage is 24 V DC, with a permitted tolerance range of -10 / +20 %.

  • Page 27: Rack Mounting

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.2.7 Rack Mounting Use the adapters (supplied) to mount the RTC 1100.B Controller in 19" racks. NOTE If mounting in a rack, ensure that the permissible ambient temperature of 55°C is not exceeded. This is especially important if mounting together with other units which give off heat.

  • Page 28: Adjustment Using Rtm 1501 Dummy Antenna (Option)

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] NOTE For the phase adjustment, it is important that the selection switch for reference direction (18, Fig. 2-1) is in position QDM and the North adjustment is 0°. NOTE The RT-1000 does not include a test transmitter for this purpose, so an external signal source or transmitter must be used.

  • Page 29: North Adjustment

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.2.10 North Adjustment The bearing display (QDM/QDR) is relative to magnetic north, under the condition that the antenna is mechanically adjusted towards magnetic north (see section 4, Antenna). Perform exact adjustment using the north adjustment of the controller. The correction value for north adjustment appears on the frequency display (8, Fig.

  • Page 30: Variation Adjustment

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] If the squelch level is reduced to the value 00% and the key “-“ (29, Fig. 2-1) is pressed one more time, the display shows the character “PT” ( “PT” = Potentiometer) alternating with the squelch value, which is set by the manual squelch.

  • Page 31: Disable Selection Of Reference Direction

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.2.13 Disable Selection of Reference Direction There are applications where a change of reference direction from QDM to another direction is not allowed or makes no sense. For those cases, it is possible to disable the reference direction switch. If it is disabled, digital display (2, Fig.

  • Page 32: Ground Transmitter Suppression

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.2.14 Ground Transmitter Suppression If you do not want to measure the bearing to the ground transmitter, connect the PTT jack (27, Fig. 2- 2) on the rear of the unit with a normally-open contact of the transmit button. See Figure 2-7 for wiring diagram.

  • Page 33: Display And Operating Functions

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] Display and Operating Functions 2.3.1 Bearing Display and Bearing Quality Analysis The bearing is displayed on a luminous, 3-figure digital dis- DF Direction averaged play (2, Fig. 2-1) which may be...

  • Page 34: Repeat" Repetition Of Bearing Indication

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] b) Functional check of the two LED rings (3; 4, Fig 2-1) “Frequency offset”, “error”: The LEDs of the circular bearing display (3; 4, Fig. 2-1) are illuminated cyclically as long the key “TEST”...

  • Page 35: Frequency Selection

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.3.4 Frequency Selection Depending on the chosen options, the following frequency ranges are available: VHF – air band 25 kHz frequency steps: 118.000 to 136.975 MHz VHF – air band 25 / 8.33 kHz frequency steps: 118.000 to 136.975 MHz VHF –...

  • Page 36: Direct Frequency Selection In The 8.33 / 25 Khz Channel Spacing

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.3.4.2 Direct Frequency Selection in the 8.33 / 25 kHz channel spacing If the system is equipped with the option 8.33 kHz channel spacing, the frequency input has to be per- formed according to ICAO Annex 10 Volume V clause 4.1.2.4 table 4.1.
  • Page 37 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] Frequency Setting / Channel Spacing Bandwidth Receiving Frequency -Display [MHz] [MHz] • • • • xxx,x00 25 kHz wide xxx,x000 xxx,x05 8,33 kHz narrow xxx,x000 xxx,x10 8,33 kHz narrow xxx,x833 xxx,x15...
  • Page 38 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] Example: Entering the operating frequency 118,975 MHz in the 8.33 kHz spacing Input frequency display (8, Fig. 2-1) _ _ _ . _ _ _ 1 _ _ . _ _ _ 1 1 _ .

  • Page 39: Recalling A Frequency Memory

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.3.4.3 Recalling a Frequency Memory Frequencies may be recalled from frequency memories 0 to 9 using the R (Recall) button and buttons 0 to 9 on the key pad for entering frequencies (13, Fig. 2-1). First, press the R button, followed by number 0 to 9 as required.

  • Page 40: Direct Selection Of Channel Number In Maritime Radio Communication

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.3.5 Direct Selection of Channel Number in Maritime Radio Communication Channel number ranges in duplex operation: 01 to 07, 18 to 28, 60 to 66 and 78 to 88 simplex operation: 08 to 17 and 67 to 77 For direct channel number selection (for maritime radio communication only), use the bottom “C”...

  • Page 41: Scanning

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] Example: Input of channel number 16 (reception of a simplex channel) Eingabe Anzeige Kanal-Display (8, Fig. 2-1) If the channel number is not entered correctly within 10 seconds, the controller switches back to the last frequency or channel set.

  • Page 42: Stopping Scanning

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] If you wish to continue scanning although a signal is being received, press the relevant scan mode key and keep pressing until a new frequency is set. Example: In UP scanning, a signal is being received at 125.000 MHz and scanning stops. If you still wish to continue UP scanning, press key “UP”...

  • Page 43: Selection Of The Reference Directions Qdm, Qdr, Quj Und Qte

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.3.9 Selection of the reference directions QDM, QDR, QUJ und QTE By use of the reference direction switch (18, Fig. 2-1), the reference directions QDM, QDR, QUJ and QTE can be displayed on the digital bearing display. The selected reference direction is shown at the reference display (17, Fig.
  • Page 44 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] The interrelation will be shown in the following Figure: The picture shows the variation of 15°W. Then the variation value is -15° acronym meaning True north Magnetic North ATTENTION Only forward QDM bearings to an aircraft pilot. Other reference directions will cause a significant danger of confusion! - 2.29 -...

  • Page 45: Checking The Variation Adjustment

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.3.10 Checking the Variation adjustment After switching on the Controller Unit, the test routine will start. The reference display (17, Fig. 2-1) shows “VAR“ for variation. At the end of the test routine, the adjusted value for the variation is shown on the digital bearing display (2, Fig.

  • Page 46: Dimmer (1) "Dim

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.3.13 Dimmer (1) "DIM" The dimmer (1, Fig. 2-1) is used to change the brightness of the QDM display (2, Fig. 2-1), circle of bearing display (3, Fig. 2-1), circle of "live" bearing display (4, Fig. 2-1), error display (6, Fig. 2-1) and frequency deviation display (5, Fig.

  • Page 47: Line" Mains Switch (19)

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.3.18 "Line" Mains Switch (19) Mains switch (19, Fig. 2-2) provides a double-pole disconnection of the power supply module from the mains. The DC power supply is not affected, which means that, with the switch in the "OFF"-position, the power supply module is switched to the DC power input.
  • Page 48 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] D-sub-jack 25-way Plug wiring: Signal Meaning NF 2 AF audio signal (floating) (RT-1000 C only) PHI-1 Bearing signal 1 (RT-1000 C only) PHI-2 Bearing signal 2 (RT-1000 C only) PHI-2 Bearing signal 2...

  • Page 49: Sync" Synchronisation Indicators (23, 24)

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.3.21 "Sync" Synchronisation Indicators (23, 24) The green indicator (24, Fig. 2-2) lights up if, in the controller, the electronics in the Frequency Pro- cessing module RTC 1107 is synchronised with the reference signal from the Antenna Control module RTR 1201.

  • Page 50: Serial Port" Serial Interface (30)

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.3.24 "Serial Port" Serial Interface (30) The serial interface (30, Fig. 2-2) enables the transfer of bearing data to an external control unit and also permits remote control by an external control unit.

  • Page 51: Data Output

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.3.24.1 Data Output The data output is continuous, i.e. no control by means of a handshake signal or control characters is necessary. Message Header Content "Average" bearing 0 to 359° (QDR)
  • Page 52 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] The following example shows the output of the average QDR bearing 315° as a sequence of ASCII characters : A315CRLF Average bearing 315° (QDR) Final character {= decimal: 13 and 10}...

  • Page 53: Data Input

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.3.24.2 Data Input All received data are checked for correct syntax and plausibility referring to the actual unit setting. All received data are also checked for compliance with the limiting values. The data input is monitored over a time-out of 100 ms, i.e.
  • Page 54 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] The following example shows the data sequence for the frequency command: F125375CRLF Frequency 125.375 MHz Final character {= decimal: 13, 10} Content {= decimal: 49, 50, 53, 51, 55, 53} Header...

  • Page 55: Technical Data

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.3.24.3 Technical Data Data format: ASCII-8-Bit (7 data bits + 1 parity bit) (ASCII-II-character format) Stop bit: Parity: Baud rate: 1200 Mode: asynchronous Level: RS-232 High: +3 V to +15 V...

  • Page 56: Connection To A Data Terminal Or Data Transmission Device

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.3.24.5 Connection to a Data Terminal or Data Transmission Device Controller Data terminal or data RTC 1000 transmission device The pin numbering of the data terminal device connector applies for most PCs with 9-way D-Sub con- nectors.

  • Page 57: Compatibility Mode

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.3.24.6 Compatibility mode It is possible to select a compatibility mode for the serial interface. This can be useful if the interface is connected to already existing applications which cannot handle the new messages of the data output (RT-1000 system revisions of [Rev 4.00.00] or higher).

  • Page 58: Time Sequence

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.3.25.1 Time Sequence not valid not valid valid D9-OUT not valid valid not valid D0 .. D8-OUT STR1 2.3.26 R/L Off Button (42) The R/L Off button (42, Fig. 2-2) interrupts the right/left antenna rotation control. If this button is pressed and a received signal is present, the value 000°...

  • Page 59: Manual Squelch Adjustment Potentiometer (49)

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] The red frequency offset control lamps (46, 47, Fig. 2-2) light up if a signal with a frequency deviation larger than allowed is received. This shows that a signal is being received which is not suitable for di- rection finding purposes.

  • Page 60: Installation Dimensions

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 2.4 Installation Dimensions - 2.45 -...
  • Page 61 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] Mounting Cut-out 465.1 - 2.46 -...
  • Page 62 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 4 DIRECTION FINDER ANTENNA RTA-1300.A List of Content 4 DIRECTION FINDER ANTENNA RTA-1300.A ....... 4.1 Installation ...................... 4.3 4.1.1 General ..........................4.3 4.1.2 Reflections and there influence of the bearing result...........4.3 4.1.3...
  • Page 63 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] List of Figures Fig. 4-1 Free-space propagation of radio waves Fig. 4-2 Field of lines of equal phase relations for two coherent waves Fig. 4-3 Reflected path distance and direct path distance of the radio wave Fig.

  • Page 64: Installation

    In all other cases, if bearing results of the RT-1000 A would not be sufficiently accurate due to the re- quired unfavourable antenna position close to the controller, RT-1000 C should be chosen instead.
  • Page 65 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] Degree Dipole Dipole Transmitter Receiver Path = Wavelength at v = c v = Velocity of Propagation c = Velocity of light Transmitter Receiver Isophases Fig. 4-1 Free-space propagation of radio waves Figure 4-1 gives an extremely simplified representation of even radio wave propagation in free space.
  • Page 66 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] Accordingly, the propagation characteristics of radio waves of a wavelength of approximately λ < 10 m increasingly resembles those of light. At a wavelength of 1 m to 3 m, wave propagation requires a direct path and if this is not available, only reflected waves are received.
  • Page 67 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] As shown in Figure 4-2, in the case of wide-aperture direction finders, this movement causes slight azimuth oscillations. In contrary, this oscillation is larger in the case of compact direction finders - the series of small circles in Figure 4-2.

  • Page 68: Influence Of Ground Reflections To The Df Accuracy

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] 4.1.3 Influence of ground reflections to the DF accuracy The signal transmitted by an aircraft transmitter will reach the DF antenna on the direct way. Additional- ly, a part of the signal will be reflected at the ground and will reach the antenna as well. Depending on the angle of incidence and the height at which the DF antenna is located above the ground, the direct signal and the reflected signal have to propagate over different distances.
  • Page 69 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] Vertical diagram for h = 23 m Vertical diagram for h = 3.5 m Fig. 4-5 Signal strength lobes plotted against angle of elevation The zeros of the vertical diagram can be determined using the following formula: c= light velocity [m/s] λ= wave lenght of the signal [m]...
  • Page 70 (see Fig 4-6). If the antenna is mounted on the RHOTHETA antenna mast RT-1306, the antenna head is about 4 Meters above the ground. The 1. zero point will be in an elevation of approx. 17°above the horizon.
  • Page 71 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00] M a x i m u m M i n i m u m M i n i m u m M a x i m u m M i n i m u m...
  • Page 72 GPS bearing to the DF side. Here, both bearings can be com- pared. RHOTHETA can support you with an automatic test recording system in this case. During the radial flights, the aeroplane flies across the direction finder from various directions to find out detrimental ground reflections and the cone of silence, the area above the direction finder where no usable information can be obtained from the direction finder.

  • Page 73: Notes On Fig. 4-8 / 4-9, Rta 1300.A Direction Finder Antenna

    RHOTHETA Elektronik GmbH User Manual RT-1000 [Rev. 4.01] 4.2 Notes on Fig. 4-8 / 4-9, RTA 1300.A Direction Finder Antenna Designation Function Lightning conductor rod Radiator cover Radiator Clamping nut Radiator flange Antenna head North dipole label Mast tube X 21...
  • Page 74 RHOTHETA Elektronik GmbH User Manual RT-1000 [Rev. 4.01] Fig. 4-8 RTA 1300.A Direction Finder Antenna - 4.13 -...
  • Page 75 RHOTHETA Elektronik GmbH User Manual RT-1000 [Rev. 4.01] Fig. 4-9 RTA 1300.A Direction Finder Antenna (bottom view) - 4.14 -...

  • Page 76: Assembly Instructions

    RHOTHETA Elektronik GmbH User Manual RT-1000 [Rev. 4.01] 4.3 Assembly Instructions Fit O-ring on mast tube. (see Figure 4-10). Pull antenna cable through mast tube. O-ring Connect RF cable. Screw cord grip fixing to clamp RF cable. Plug the control cable into the connection board: Using pointed flat-nose pliers, grip the flat plug covers and push fully onto the flat plugs.
  • Page 77 RHOTHETA Elektronik GmbH User Manual RT-1000 [Rev. 4.01] Apply a thin coat of grease to the antenna head / mast tube contact faces. Screw antenna head onto mast tube. Fit O-ring to lightning conductor rod (see Fig. 4-10). Apply thin coat of grease to antenna head / lightning con- ductor rod contact faces.

  • Page 78: North Alignment Of The Direction Finder Antenna And Determining The System Accuracy At The Installation Site

    RHOTHETA Elektronik GmbH User Manual RT-1000 [Rev. 4.01] 4.4 North Alignment of the Direction Finder Antenna and Determining the System Accuracy at the Installation Site The north alignment is used to harmonize the angle determined by the direction finder with the actual (magnetic) north-related azimuth values.

  • Page 79: Flight Checking For Exact North Alignment And Determining The System Accuracy At The Installation Site

    RHOTHETA Elektronik GmbH User Manual RT-1000 [Rev. 4.01] Activate the transmitter and transmit a continuous signal. NOTE If transmitting with a monopole antenna (e.g. a hand held RT unit), due to undefinable radiation conditions, care must be taken to ensure that the an- tenna is as free as possible from disturbances and vertically installed.

  • Page 80: Determining The Position Using A Theodolite

    RHOTHETA Elektronik GmbH User Manual RT-1000 [Rev. 4.01] NOTE If the communication system of the aircraft is used as a transmitter, check beforehand whether it is suitable for continuous operation. The radius of the circle and the flight speed shall be selected such that the "lag error" effect when de- termining the bearing is negligibly low.

  • Page 81: Simplified Method

    RHOTHETA Elektronik GmbH User Manual RT-1000 [Rev. 4.01] 4.4.2.3 Simplified Method If no theodolite or GPS receiver is available, a simplified measuring procedure must be used at the actual antenna installation site to precisely north align the system and determine its accuracy.
  • Page 82 RHOTHETA Elektronik GmbH User Manual RT-1000 [Rev. 4.01] Where there is correct reception without reflections the bearing signal appears as shown in Figure 4-14. Both blocks, clockwise and counter-clockwise rotation, have the same amplitudes. The envelope curve of the oscillation increases steadily (in accordance with an e-function) and has no "dips".
  • Page 83 RHOTHETA Elektronik GmbH User Manual RT-1000 [Rev. 4.01] Fig. 4-15 DF signal 2 and R/L signal with a modulated reception signal DF signal R/L signal The direction finding signal is very noisy. Possible causes: The field strength of the transmission signal is too low.
  • Page 84 RHOTHETA Elektronik GmbH User Manual RT-1000 [Rev. 4.01] Amplitudes of clockwise rotation blocks or counter-clockwise rotation blocks "pump" The amplitudes of the clockwise rotation blocks and counter-clockwise rotation blocks are different Possible causes: Effect of reflection Extreme flight manoeuvres of the calibration aircraft...

  • Page 85: Evaluation Of Qdr Live Display (Yellow Light Dot Circle)

    RHOTHETA Elektronik GmbH User Manual RT-1000 [Rev. 4.01] 4.4.3.2 Evaluation of QDR Live Display (Yellow Light Dot Circle) The QDR live display (yellow light dot circle; 4, Fig. 2-1) serves as a further criterion of the quality of the direction finding (including during every day operation).

  • Page 86: Evaluation Of Measuring Results

    RHOTHETA Elektronik GmbH User Manual RT-1000 [Rev. 4.01] 4.4.3.3 Evaluation of Measuring Results The deviations between the desired and actual values are entered in the test record compiled with the aid of the flight check. If in the case of a calibration aircraft the direction finding signal or the yellow light dot indication is evaluated, the observations made at the corresponding measured values are to be annotated.

  • Page 87: Determining The North Correction

    RHOTHETA Elektronik GmbH User Manual RT-1000 [Rev. 4.01] 320° 319° -1° 330° 330° ±0° 340° 343° +3° 350° 351° -1° In the example, larger deviations occur when measuring for the 20°, 110° and 210° desired values. As can be seen by the evaluation of the direction finding signal and the yellow light dot circle, they are due to shadowing of the transmitter and reflections.

  • Page 88: Installation Dimensions

    RHOTHETA Elektronik GmbH User Manual RT-1000 [Rev. 4.01] 4.5 Installation Dimensions RTA 1300.A Direction Finding Antenna Mast pole with mast pole and lightning conductor rod - 4.27 -...
  • Page 89 EC Declaration of Suitability for Use ................5.3 5.2.3 RT-1000 A as a system in air traffic management - approval within the EU....5.4 Interwiring of the Direction Finder RT-1000 A ..........5.5 Correlation channel number / frequency in the maritime radio band ..5.6 Test Record / DF Final Test Report ..............

  • Page 90: Eu Declaration Of Conformity

    5.2.1 Approval in the Federal Republic of Germany / EU The approval of the system RT-1000 A is carried out in Germany according to the FSMusterzulV (air traffic control systems and equipment Pattern Approval Regulation). NOTE This Regulation determines the requirements for type certification of equipment for air traffic control and lays down the procedure of the type certificate.

  • Page 91: Ec Declaration Of Suitability For Use

    The approval number is labelled on the RT-1000 A. Approval label: The components of the direction finder RT-1000 A are provided with labels which contain the approval number of the “Bundesaufsichtsamt für Flugsicherung”. These signs must not be removed nor covered.

  • Page 92: Rt-1000 A As A System In Air Traffic Management - Approval Within The

    RT-1000 A as a system in air traffic management - approval within the In the European Union, the RT-1000 A may be provided as a system for air traffic management at the service, only if it has been tested for compliance with the essential requirements and relevant imple- menting rules for interoperability and if it complies.

  • Page 93: Interwiring Of The Direction Finder Rt-1000 A

    User Manual RT-1000 A [Rev 4.00.a] 5.3 Interwiring of the Direction Finder RT-1000 A D i r e c t i o n F i n d e r A n t e n n a R T A 1 3 0 0 . A...

  • Page 94: Correlation Channel Number / Frequency In The Maritime Radio Band

    RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00.a] Correlation channel number / frequency in the maritime radio band Channel No. Frequency (sea side station) Frequency (coast station) 156,050 MHz 160,650 MHz 156,100 MHz 160,700 MHz 156,150 MHz 160,750 MHz...
  • Page 95 RHOTHETA Elektronik GmbH User Manual RT-1000 A [Rev 4.00.a] 156,575 MHz 156,625 MHz 156,675 MHz 156,725 MHz 156,775 MHz 156,825 MHz 156,875 MHz 156,925 MHz 161,525 MHz 156,975 MHz 161,575 MHz 157,025 MHz 161,625 MHz 157,075 MHz 161,675 MHz 157,125 MHz...

  • Page 96: Test Record / Df Final Test Report

    For this purpose, RHOTHETA uses a fully automatized test stand. The result of each test is recorded in a test report “DF Final Test Report”. To each direction finder system RT-1000 A, the test protocol is en- closed at delivery.

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