Rhotheta RT-300 User manual

User Manual
Installation and Operating
R
RT T- -3 30 00 0
2-Band Precision Bearing System
VHF / UHF

User Manual Bearing System RT-300
Issue: 2017/06/27 [Rev 1.04.c] Page 2 of 79 12-9-1-0013-9-2-0001-3-1-60
Edited by:
RHOTHETA Elektronik GmbH
Kemmelpark
Dr.-Ingeborg-Haeckel-Str. 2
82418 Murnau
Germany
Tel.: [phone] - 0
Fax: [phone] - 15
E-Mail: [email protected]
Internet: www.rhotheta.de
Copyright © RHOTHETA Elektronik GmbH
All rights reserved
-Document Number: 12-9-1-0013-9-2-0001-3-1-60
-Issue: 2017/07/27 [Rev 1.04.c]
NOTE
The manufacturer reserves the right on making modifications at any time and without previous
information of the here described product.

User Manual Bearing System RT-300
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User Manual Bearing System RT-300
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Content
1SAFETY INSTRUCTIONS 7
1.1Legend of Symbols 7
1.2Basic Safety Instructions 8
2EU DECLARATION OF CONFORMITY 8
3GENERAL INFORMATION 9
3.1Purpose of Use 9
3.1.1Mobile Use 9
3.1.2Stationary Use 9
3.2Content of Delivery 9
3.3Front View DCU (Display Control Unit) 10
3.4Brief Summary DCU 10
3.5Rear View DCU 12
4TECHNICAL DATA 13
4.1Electrical Characteristics 13
4.2Mechanical Characteristics 15
4.2.1DCU 15
4.2.2Antenna 16
5DISPLAY AND OPERATING 17
5.1Display 17
5.1.1LED-Circle 17
5.1.2General Lighting 17
5.1.3LC -Graphic-Display 18
5.1.4Digital Bearing Value Display 18
5.1.5Direction of Reference 18
5.1.6Display of Signal Level 19
5.1.7Squelch Level 19
5.1.8Frequency / Channel Display (not available in VHF/UHF-Version) 19
5.1.9Status Display 19
5.1.9.1Warning 19
5.1.9.2“ERROR“ Message 20
5.1.10SCAN-Display 21
5.1.11Selective Squelch (only ELT) 21
5.1.12Status Alarm Contact 21
5.2Operating the Bearing System RT-300 21
5.2.1Switching On and Off: Key 1: On/Off 21
5.2.1.1Switching On 21
5.2.1.2Switching Off 21
5.2.1.3External Switching On/Off 21
5.2.2Switching the Band: Key 16 < Band > 22
5.2.3Selection of Frequency / Channel: Key 15 < Channel / Frequ. > 22

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5.2.4Squelch Function: Key 14 < Squelch > 23
5.2.4.1Common Remark 23
5.2.4.2Adjusting the Squelch 23
5.2.5Volume: Key 5 < Vol.+ > and 10 < Vol.– > 24
5.2.6„Selective Squelch“: Key 4 < ELT only > 24
5.2.6.1Common Remark 24
5.2.6.2Activating / Deactivating „Selective Squelch“ 25
5.2.7Scan Function: Key 12 < Scan > 25
5.2.7.1Common Remarks 25
5.2.7.2Activating Scanning Function 26
5.2.7.3Deactivating Scanning Function 26
5.2.8Function Repeat: Key 3 < Repeat > 26
5.2.9Function Live: Key 8 < Live > 27
5.2.10Function Clear: Key 9 < Clr > 27
5.2.11BID-Indicator 27
6THE MENU 28
6.1The Menu Structure 29
6.2The Main Menu 30
6.2.1Structure 30
6.2.1.1Menu LIGHT/LCD 31
6.2.1.1.1Adjusting Brightness of LC- Display: Function DIM LCD 31
6.2.1.1.2Adjusting Brightness of Keyboard Lighting: Function DIM LEGEND 32
6.2.1.1.3Adjusting Brightness of LED-Circle: Function DIM CIRCLE 32
6.2.1.1.4Adjusting Contrast of the LC-Display: Function LCD CONTRAST 32
6.2.1.2Menu: BEARING 33
6.2.1.2.1Selecting Bearing Reference Direction: Selecting Function BEARING TYPE 33
6.2.1.2.2Display Bearing Parameters: VIEW BEARING SETUP 36
6.2.1.3Menu: INFO 36
6.2.1.3.1INFO Beacon 36
6.2.1.3.2INFO Receiver 37
6.2.1.3.3INFO DCU (Display Control Unit) 37
6.2.1.3.4INFO Statistics 37
6.2.1.4Menu: SOUNDS 38
6.2.1.4.1Adjusting Key Volume: Function BEEP VOLUME 38
6.2.1.4.2Adjusting Volume Alarm Signal: Function ALARM VOLUME 38
6.2.1.5Menu: SETUP 39
6.2.1.5.1SETUP-Menu BEARING 39
6.2.1.5.2SETUP Menu RECEIVER 44
6.2.1.5.3SETUP Menu: SERIAL 46
6.2.1.5.4SETUP Menu: COMPASS 49
6.2.1.5.5SETUP Menu: OTHER 55
6.2.1.5.6SETUP Menu: FACTORY RESET 57
6.2.1.6MENU: SERVICE 59
6.2.1.6.1Service Menu: BEARING 59
6.2.1.6.2Service Menu: RECEIVER 60
6.2.1.6.3Service Menu: DCU 60
6.2.1.6.4Service Menu: COMPASS 61
6.2.1.6.5Service Menu: REBOOT 61
6.3Special Functions 62
6.3.1Locking / Unlocking the Setup Menu 62

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6.3.2Resetting Brightness and Contrast Adjustment of Display 62
6.3.3Loading Firmware Updates 62
6.4Interfaces 62
6.4.1Antenna Connector on DCU 62
6.4.2Power Connector 63
6.4.2.1Power Supply 64
6.4.2.2External Speaker 65
6.4.2.3Alarm Contact 65
6.4.2.4Extern Input 65
6.4.2.5Analog Test 65
6.4.3Interface Connector 65
6.4.3.1RS-232-Interface 66
6.4.3.2RS-485-Interface 66
6.4.3.3NMEA (RS-422) Interface 66
7INSTALLATION AND PUTTING INTO OPERATION 67
7.1Installation of Display-Control-Unit DCU 67
7.1.1DCU Installing Cut-Out 67
7.1.2Connecting Power Supply 68
7.1.3Connecting the DCU to Ground 68
7.1.4Connecting Antenna 69
7.2Determination of Antenna Position 69
7.3Completing Antenna Cable 70
7.3.1Type of Cable 70
7.3.2Connecting Pattern of Antenna Cable: 70
7.4Installing the Antenna 72
7.4.1Fixing Screw Joint on Mast Tube 72
7.4.26-Holed Mast Flange 72
7.4.3Installing Antenna Cable with Pull-Relief 72
7.4.4Fixing the Antenna 73
7.4.5Aligning Antenna for Mobile Use 73
7.4.6Aligning Antenna for Stationary Use 73
7.4.7Mounting of Antenna Beams 74
7.5Configuring Setup 75
8MAINTENANCE AND CLEANING 77
8.1Maintenance 77
8.2Cleaning 77
9PRODUCT DISPOSAL 78
9.1Disposal within the European Union 78
9.2Disposal outside the European Union 78
10APPENDIX 79
10.1Wiring Pattern (recommended RT-300 DCU connections plan) 79

User Manual Bearing System RT-300
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1 Safety Instructions
RHOTHETA Elektronik GmbH is constantly trying to keep the safety standard of the products up
to date and to offer the customers the highest possible level of security.
RHOTHETA products are designed and tested in accordance with the valid safety regulations.
The compliance with these standards is continuously monitored by our quality assurance
system. This product is manufactured in accordance with the EC Certificate of Conformity,
tested and left the factory in perfect technical and safety-relevant condition.
To maintain this condition and to ensure safe operation, the user must pay attention to all
instructions and warnings given. For any questions regarding these safety instructions,
RHOTHETA Elektronik GmbH can be contacted at any time.
The observance of the safety instructions will help to prevent personal injury or damage caused
by all kinds of dangers. This requires that the following safety instructions must be read carefully
and understood before using the product, as well as observed when using the product. The
additional safety instructions such as for protecting persons appear in relevant parts of the
product documentation and must also be paid attention to.
In addition, it is the responsibility of the user to use the product appropriately. The product RT-
300, a dual-band direction finder system RT-300 may not be used in any way that a person /
thing is injured or damaged.
The use of this product other than its designated purpose or in disregard of the instructions of
the manufacturer is the responsibility of the user. The manufacturer takes no responsibility for
the misuse of the product.
The manufacturer is not liable beyond the scope of legal rules!
This guide is part of the product RT-300 and is retained throughout the lifetime and to pass with
the product.
1.1 Legend of Symbols
NOTE
This symbol designates tips or additional notes that must be paid attention to and make work
easier.
ATTENTION
means that ignoring the instructions may lead to property damage or loss of
data.

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1.2 Basic Safety Instructions
At all work, the local or national safety and accident prevention regulations must be
observed.
Use only the manufacturer prescribed components and / or use only recommended material
by the manufacturer and do not change this.
Connect only approved accessories kits or additional equipment.
The product may only be opened by authorized service personnel.
The unit voids its type approval on operating with unauthorized modifications on the device or
not the intended use.
2 EU Declaration of Conformity
Hereby RHOTHETA Elektronik GmbH declares that the product RT-300 is in compliance with
the essential requirements and other relevant provisions of:
Directive 1999/5/EC on radio equipment and telecommunications terminal equipment
(relevant for RT-300 AU)
Directive 2004/108/EC relating to electromagnetic compatibility (relevant for RT-300 DCU)
Directive 2006/95/EC relating to electrical equipment designed for use within certain voltage
limits (relevant for RT-300 DCU)
Directive 2011/65/EU on the restriction of the use of certain hazardous substances in
electrical and electronic equipment (relevant for RT-300 AU and RT-300 DCU)
The full text of the Declaration of Conformity can be found at:
http:// www.rhotheta.com/products/rt_300
ATTENTION
Read and observe the following instructions, warnings and safety
instructions of the manufacturer!
WARNING
means that ignoring the instructions, there may a danger to health or life.

User Manual Bearing System RT-300
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3 General Information
3.1 Purpose of Use
3.1.1 Mobile Use
The RT-300 bearing system allows bearing of radio signals (radio telephony) in the UHF
airband (241,000…243,000…245,000MHz) as well as bearing of signals on the international
VHF distress frequency (121,500 MHz).
For training purposes a whole frequency range of the airband 118,800 ... 124,000 MHz is
tuneable.
Integrating a professional SAR-bearing system, the RT-300 bearing system allows quick
bearing and detecting of EPIRB equipped persons or vessels.
Especially designed for use under rough circumstances on sea vessels the system is extremely
compact. The antenna and the display control unit are waterproof. The most sensitive receiving
system allows bearing of weakest signals.
3.1.2 Stationary Use
As traffic bearing system the RT-300 has a wide range of use, e.g. surveillance of coastal
shipping traffic as well as alerting rescue crews in case of accident.
3.2 Content of Delivery
1 User Manual
1 Display Control Unit DCU
1 Antenna Unit AU
1 Pull-relief
1 Mounting kit
1 Connecting cable, D-SUB, 9-pole
1 Power supply cable including fuse holder
8 Antenna beams, ø 6 mm, length 30 cm
1 Fastening kit incl. 1 spare fuse (1A inert)
(4 fixing bolts M4x30 DIN 912 + 4 washers M4 + 4 lock washers + 4 nuts M4)
1 DCU installing cut-out
2 D-SUB plug male
2 D-SUB plug female
1 Documentation “RT-300 NMEA Serial Communication & Remote Control”
1 Test protocol (signed and stamped)
ATTENTION
The bearing system RT-300 is not approved for primary navigation purposes.

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3.3 Front View DCU (Display Control Unit)
Fig. 1: Front view
3.4 Brief Summary DCU
Pos. Designation Function see chapter
01
Switching on and off the bearing system 5.2.1
02 LED-circle Indicates RB (RB = relative bearing)
resolution 10°
5.1.1
03
Repeat: Bearing-mode, indicates last bearing value
during signal pauses
: - In menu-mode: moves selecting field to
the left
- In adjusting-mode: sets value to minimum
- In frequency-/ channel-selecting-mode:
moves decimal to the left
5.2.8
04
Bearing-mode: Activating of „selective squelch“.
(bearing and alerting functions will only be working if
ELT modulation is recognized). Function only
available in airband.
5.2.6
05
Vol. + :In bearing-mode: increases audio-volume
: - In menu-mode: moves selecting field
upwards
- In adjusting-mode: increases value for one
step
5.2.5
1
16
3
15
4 5 6
8
9
12 11 10
7
13
14
2

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Pos. Designation Function see chapter
06
Confirms input or selection
07
Call-up menu or leaving menu 6
08
Live : In bearing-mode: displaying unaveraged
bearing values, if key is pressed.
: - In menu-mode: moves selecting field
upwards
-In selecting-mode: increases value to
maximum
- In frequency-/ channel-selecting-mode:
moves decimal to the right
5.2.9
09
Clr : In bearing-mode: cancelling bearing
average store
Esc : In selecting-mode: jumps to next higher
level
In adjusting-mode: ignores last not
confirmed input and jumps to next higher
level
5.2.10
10
Vol. - : In bearing-mode: decreases audio volume
: In menu-mode: moves selecting field
downwards
: In adjusting-mode: decreases value for one
step
5.2.5
11 Speaker Internal speaker output
12
In bearing-mode: activating and de-activating of
scan-function (confirming with ”OK”)
5.2.7
13 LC-Display Depending of operating mode display of following
information:
bearing mode:
- bearing value
-reference direction
-signal strength
-squelch threshold
-active frequency / channel
-status report
-time since last bearing
-scan function
-“selective squelch” (ELT only)
selecting-mode: - Menu
(Menu) - menu level
adjusting-mode: - adjusting range / menu
-limit values
-active buttons
5.1.3
14
Activating squelch adjusting mode 5.1.7
15
Activating mode for channel selection (maritime
band) or frequency selection (airband)
5.2.3
16
change-over between maritime band and airband 5.2.2

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3.5 Rear View DCU
Pos. Designation
Type plate
Antenna connector
Ventilation
Interface connector
Power supply connector
Ground (Gnd)
Fig. 2







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4 Technical Data
4.1 Electrical Characteristics
Designation Value Remarks
Bearing principle Doppler 3 kHz rotational frequency,
delay time compensation
Direction of bearing
reference, digital display
-REL
-MAG
-TRU
- to antenna direction
- relative to magnetic north
- relative to geographic north
Direction of bearing
reference
LED-circle
relative - to antenna direction
bearing error < 5° In undisturbed wave field,
sufficient field strength
assumed, signal without
modulation.
Resolution
Digital display
LED-circle
1°
10°
LC-graphic-display 98x32 dots brightness and contrast
adjustable
Sensitivity
Airband: ≤0,5 µV/m
Frequency range
VHF Airband:
UHF Airband:
118,800 ... 124,000 MHz
241,000 … 245,000 MHz
Channel pattern 25 KHz
Bearable types of
modulation
A3E; F3E, A3X (ELT-
modulation)
bearing largely independent of
type of modulation
Polarisation vertical
Polarisation error ≤5° at 60° rotation of field vector
Cone of silence ca. 30° to the vertical
time of response 300 ms depending on field strength of
signal
Audio-output max. 1,5 W at 4 Ohm
operating temperature
range
DCU: -20° ... +60° C
AU: -40° ... +60° C
at low temperatures running in
time up to 5 minutes
Range of operating
voltage
12 … 28 Volt DC

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Designation Value Remarks
Current consumption at 12V DC voltage supply:
350 mA (4,8 W)
400 mA (5,4 W)
450 mA (5,4 W)
600 mA (7,2 W)
800 mA (9,6 W)
bei 28V
Versorgungsspannung:
250 mA (7,0 W)
300 mA (8,4 W)
350 mA (9,8 W)
400 mA (11,2 W)
600 mA (16,8 W)
-standby
-typ. without ext. speaker
-max. without ext. speaker
-typ. with ext. speaker
-max. with ext. speaker
-standby
-typ. without ext. speaker
-max. without ext. speaker
-typ. with ext. speaker
-max. with ext. speaker

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4.2 Mechanical Characteristics
4.2.1 DCU
Weight: ca. 700 g
Dimensions: see Fig. 3
Protection of housing: IP 67
220
210
192
192
80
113
16 26
58.85 5.5
105
R8
45°x1
D-Sub connector male
rubber sealing
R5
30.44
17.86
ø4.5
M5
D-Sub connector female
24.8
26.8
21.8
27.8
Fig. 3

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4.2.2 Antenna
Weight: ca. 1300 g
Dimensions: see Fig. 4
Protection of housing: IP 671
Antenna beams: 8 pcs. (4 dipoles)
The mast flange can be changed by
loosening the 6 domed nuts .
The bearing antenna is available with 2
different antenna flanges:
1. Threaded flange (see Fig. 6)
2. 6-hole flange (see Fig. 5)
1sealed housing flange (e.g. if using pull-relief Fig. 4)
Fig. 4
Fig. 5
Fig. 6
ATTENTION
Warranty is expiring if opening
the antenna.




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5 Display and Operating
All display and operating elements are situated on the front of the Display-Control-Unit (DCU).
5.1 Display
LED circle general lighting
status display
display
frequency/channel
scan display
level digital
direction of reference
level analog
digital bearing value selective squelch
status of alarm-contact squelch-level
Fig. 7: Display
5.1.1 LED-Circle
Corresponding to a resolution of 10°, the LED-circle is made of 36 red LED’s.
The reference direction of the display is always relative to the bearing antenna and therefore to
the longitudinal axle of the vessel. The preset offset-value will be considered in the display.
Brightness of the display may be adjusted in submenu LIGHT - DIM CIRCLE.
Receiving a signal, the bearing value will be displayed with the corresponding LED. If the signal
isn`t received anymore for a certain time, the last bearing value will be displayed with the
corresponding LED flashing. This time may be adjusted in the submenu SETUP -BEARING -
LAST TIME.
5.1.2 General Lighting
There are 4 green LEDs within the LED-circle as an orientating aid. They are placed in the
directions north, east, south and west.
The brightness of these green and red LEDs may be adjusted in submenu LIGHT - DIM
CIRCLE.

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Indicating 28 sec
since last bearing
5.1.3 LC -Graphic-Display
The centered LC-Display is showing all relevant bearing data, adjustments and status reports.
Background brightness may be adjusted in submenu LIGHT/LCD - DIM LCD, contrast in
submenu LIGHT/LCD - CONTRAST.
When adjusting, the range of adjustment will be displayed as well as the active keys and their
function:
-In menu-mode all selecting fields and adjustments are displayed.
-In bearing-mode the graphic display is divided into following fields:
-bearing valuel digital
-direction of reference
-signal level
-squelch-level
-frequenzy- / channel-display
-status-display
-SCAN-display
-selektiver squelch (only ELT)
-status of alarm-contact
5.1.4 Digital Bearing Value Display
Receiving a bearable signal, the
bearing value will appear in the
display`s lower left area as a 3-digit
figure with a resolution of 1°. If there
is no more signal available, the display will start flashing for a
certain time, alternately showing in the display „LAST“
(adjustable in submenu: SETUP - BEARING - LAST TIME).
After that the information, „last bearing“ will be shown for
10 min, indicating the duration since the last bearing.
After 10 min without signal three dashes are displayed.
Fig. 9
5.1.5 Direction of Reference
The selected direction of reference is displayed left of the
digital bearing value.
Following directions of reference may be selected:
Display Direction of reference Remarks
REL relative bearing relative to longitudinal axis of antenna (north – south)
MAG magnetic north bearing relative to magnetic north
optional internal compass module required or
compass information via NMEA interface required, input of variation
(see 6.2.1.5.4.5.3)
Fig. 8
Fig. 10

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Display Direction of reference Remarks
TRU true (geographic) north bearing relative to geographic north
optional internal compass module required or
compass information via NMEA interface required, input of
variation(see 6.2.1.5.4.5.3)
5.1.6 Display of Signal Level
The present signal level is displayed as figures (0..99%) as well as
an analog bar graph. The display is not calibrated and is serving
as a qualitative measure.
5.1.7 Squelch Level
The small triangle on top of the bar graph (see Fig. 11) is the selected squelch level. Is the bar
graph of the level-display left of the triangle, receiving is switched off.
5.1.8 Frequency / Channel Display (not available in VHF/UHF-Version)
The upper right area of the display is showing the present working
frequency or the present selected channel in the maritime band. If
a duplex channel is selected, additional information is given:
“SHIP” for a maritime radio station (lower band) or „COAST“
(upper band) for the coastal radio station.
The working frequency in the maritime band will be displayed, if
option CHANNEL MODE OFF in submenu SETUP -RECEIVER -
CHANNEL is selected.
5.1.9 Status Display
The upper left area of the display is showing status information. The
bearing system is verifying continuously different parameters and
signals. If everything is working correctly, the information “OK” will
be displayed.
If one or more parameters are leaving the permitted range of values,
a warning message or error message is displayed.
5.1.9.1 Warning
A warning message is displayed, if working parameters are nearing significantly close to the
permitted limit value, or if external bearing signals are not available anymore. The system´s
basic functions are not affected yet, but preventive measures are recommended.
A warning is displayed in the status field with the letter „W“ followed by an error indicating figure.
After that a short characterization of the warning is displayed.
At warnings, indicating the missing of a required signal, the warning message is displayed
additionally as a text instead of the digital bearing value.
Fig. 11
Fig. 12
Fig. 13

User Manual Bearing System RT-300
Issue: 2017/06/27 [Rev 1.04.c] Page 20 of 79 12-9-1-0013-9-2-0001-3-1-60
Following warning messages may be displayed:
Warning Short
designation
Meaning
W1 U-DISP Voltage supply too low
W2 U-REC Antenna voltage too low
W3 NO HEAD No heading data available
W4 NO COMP No compensation of drag error, selected data source not
available or faulty data
5.1.9.2 “ERROR“ Message
An error message is indicated, if one or more operating parameters have left the permitted
range, or if the internal electronics have detected a malfunction. In this case the bearing system
is out of order.
Following errors may be detected by the internal electronics:
Error Display message Meaning
E1 Operating voltage in display is too low
E2 Operating voltage in antenna unit is too low
E3 -no antenna connected
-malfunctioning connection AU - DCU
-defective antenna
E4 BAD ANT Faulty data from antenna to DCU
E5 BAD DCU Faulty data from DCU to antenna
E6 PLL-LO frequency adjustment in receiver module is
not working
E7 PLL-SY synthesizer of receiver is not working
E8 -- Not in use now
E9 Frequency of received signal is above
permitted range
E10
Frequency of received signal is under
permitted range