User Manual RT-800 Wideband Precision Direction Finder RHOTHETA Elektronik GmbH
RHOTHETA User Manual RT-800 Edited by: RHOTHETA Elektronik GmbH Kemmelpark Dr.-Ingeborg-Haeckel-Str. 2 82418 Murnau Germany Tel.: Fax: +49 8841 4879 - 0 +49 8841 4879 - 15 Internet: E-Mail: www.rhotheta.de email@rhotheta.de Copyright © RHOTHETA Elektronik GmbH All rights reserved - Issue: 2020/01/09 [Rev 2.02] - Document-ID: 12-9-1-0003-3-1-61 NOTE: The manufacturer reserve the right to make modifications at any time and without previous information of the here described product.
RHOTHETA User Manual RT-800 Page 3 of 78
RHOTHETA User Manual RT-800 Content 1 2 Safety Instructions .......................................................................................................... 8 1.1 Legend of Symbols .................................................................................................................................8 1.2 Basic Safety Instructions ........................................................................................................................9 Legal Information..............
RHOTHETA User Manual RT-800 7 8 6.3 Adjusting the Squelch ...........................................................................................................................37 6.3.1 Hints for Squelch Level Adjustment .........................................................................................37 6.3.2 Manual Adjusting of Squelch Levels ........................................................................................38 6.3.3 Automatic Adjustment of Squelch Levels ..............
RHOTHETA User Manual RT-800 9 8.3 Remote Control and IP-Audio Encoder Ports .......................................................................................62 8.4 Power Supply........................................................................................................................................63 8.5 Service & Maintenance Ports ...............................................................................................................64 8.5.
RHOTHETA User Manual RT-800 List of figures Fig. 1 Front View – DCU ......................................................................................................... 12 Fig. 2 Front View – Buttons and Display ................................................................................. 13 Fig. 3 Bearing Display ............................................................................................................ 15 Fig. 4 Rear view..........................................................
RHOTHETA User Manual RT-800 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.
RHOTHETA User Manual RT-800 1.2 Basic Safety Instructions ATTENTION: Read and observe the following instructions, warnings and safety instructions of the manufacturer! • 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.
RHOTHETA User Manual RT-800 2.3 FCC Information (USA) Changes or modifications not expressly approved by the party responsible for compliance (RHOTHETA) could void the user's authority to operate the equipment. Note RT-800 AU has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
RHOTHETA User Manual RT-800 3 Use and Characteristics The DF-system RT-800 combines a communication direction finder and a SAR (Search and Rescue) direction finder, thus allowing to bear all coastal and maritime radio stations. EPIRB (Emergency Position Indicating Radio Beacon) equipped persons or vessels may be found quickly and safely.
RHOTHETA User Manual RT-800 4 Short Description 4.1 Front View (DCU) 1 2 3 Fig. 1 Front View – DCU Pos. Designation 1. Control Panel 2. Speaker 3.
RHOTHETA User Manual RT-800 4.2 Front View (Buttons and Display) 18 17 16 15 1 2 14 3 13 4 5 6 12 7 8 9 10 11 Fig. 2 Front View – Buttons and Display Pos. Designation Function See page 1. Reset of the control panel 34 2. Opens dialogue window for adjustment of brightness of the TFT-display, of the LEDs and illumination of keys 43 3. Opens dialogue window for adjustment of volume and mutefunction 45 4. Opens dialogue window for adjustment of the squelch level 37 5.
RHOTHETA User Manual RT-800 Pos. Designation Function See page 8. Software controlled function keys 33 9. Closing dialogue or adjusting field without storing changed parameters 33 Arrow keys enable selection of selection fields 33 10. Increasing or decreasing of a value for one step Confirms and stores input or selection 11. 33 Closes dialogue window 12. (n/a) 13. Opens setup menu 51 14.
RHOTHETA User Manual RT-800 4.3 Bearing Display (Main Page) 21 20 19 18 17 16 1 15 2 14 3 13 4 12 11 10 5 6 8 7 9 Fig. 3 Bearing Display Pos.
RHOTHETA User Manual RT-800 Pos. Designation 9 Rep (Repeat) Meaning See page Recall last bearing value 22 10 Monitoring/scanning operation will be continued on next frequency/channel, if currently no signal is received on current frequency.
RHOTHETA User Manual RT-800 Pos.
RHOTHETA User Manual RT-800 4.4 Rear View 1 2 3 4 5 6 7 8 Fig. 4 Rear view Pos.
RHOTHETA User Manual RT-800 5 Operation 5.1 Bearing Operation The display unit of the DF-system RT-800 during the bearing operation is the concentrically arranged TFT-display. All current bearing data, settings and status reports are displayed here. Top left in the display the current main bearing frequency or, if operating in the sea band, the current main bearing channel will be displayed.
RHOTHETA User Manual RT-800 Digital display of bearing value: 74° Direction of reference Fig. 6 Digital display of bearing value The digital bearing display is a 3-digit number with a resolution of 1 degree. Depending on compass data (only used in mobile applications), the bearing data displayed digitally with following directions of reference: Display Direction of reference Meaning Relative Brg. Relative Bearing relative to longitudinal axis of antenna Magnetic Brg.
RHOTHETA User Manual RT-800 5.1.1 Instruction Fields (flags, errors and warnings) When bearing an emergency signal and additional functions are activated or operating parameters are out of their specified limits, the system will inform you by the means of instruction fields (flags): Display Meaning See page Speaker audio output is currently muted 45 Self bearing suppression (SBS) active 64 An emergency signal has been detected. Source, signal frequency and time since detection will be displayed.
RHOTHETA User Manual RT-800 5.1.2 Alarm Function During signal reception (signal level above squelch level), the signal is analysed in the background if it´s a modulated emergency signal. These emergency signals (ELT = Emergency Locator Transmitter, PLB, EPIRB) are modulated with a typical, repeating and distinct sweeping tone. Once recognized as an emergency signal, alert will be activated. A flashing alarm flag indicates the signals frequency, it´s type and duration since first reception.
RHOTHETA User Manual RT-800 case of a vessel installation). In this case the indicated bearing value will be lagging a bit to the actual bearing value. Pressing function key F1 Clr after a distinct change of heading, the corrected bearing value will be displayed immediately. In connection with an alarm flag or an error message the key Clr deactivates warning tone and alarm relay output. 5.1.5 Function Channel 16 Pressing function key F4 Ch 16 enables direct switching to maritime emergency channel 16.
RHOTHETA User Manual RT-800 5.2 Monitoring Operation Activation and adjusting monitoring operation see 6.4. The DF-system RT-800 is equipped with only one receiver, that means, only one frequency can be received at a time. Signals on other specified frequencies/channels cannot be beared at the same time. For simultaneous surveillance of the traditional emergency frequencies and any other frequencies/channels there is the function monitoring.
RHOTHETA User Manual RT-800 In order to interrupt the actual reception press key Esc (the system is continuing with next monitoring frequency). Active reception will be interrupted after 30 sec for a short moment in order to examine the other monitoring frequencies (safety function). If this feature is not desired, press key Ok . The active receiving frequency will be overtaken as the main frequency.
RHOTHETA User Manual RT-800 5.3 Standby-Operation Activating standby operation see 6.5. During standby operation the DF-system monitors the corresponding emergency frequency, the display is dimmed and the audio output is switched off. Once an emergency signal is detected on these frequencies, the system will release alarm and the display is illuminated.
RHOTHETA User Manual RT-800 5.4 Scan-Dialogue The Scan-Dialogue provides the activation of two different scan modes. In the first mode it is possible to scan eight freely selectable channels of all bands which are scanned in less than two seconds (Fast Channel Scan). In this mode a “BeepTone” filter could be activated which issues an alarm if a distinct tone frequency is recognized and ignores all other signals.
RHOTHETA User Manual RT-800 Because the channels may be set to frequencies of different bands with different noise levels, the SNR-Value can be adjusted for every channel separately. To activate the Fast Channel Scan press the key „F1“ Off. The label of the soft key changes to ON and shows that the Fast Channel Scan was activated. If the Fast Marine Scan was already activated, it is deactivated because only one scan mode could be active at a time.
RHOTHETA User Manual RT-800 General Information on Fast-Channel-Scan and Fast-Marine-Scan: If a signal is found during the scan (signal-level above squelch-level) the scan is interrupted and the bearing of the signal is started as long as the signal is present. At Fast Channel Scan one second after the signal was lost, the scanning process starts again at the next frequency / channel. At Fast Marine Scan the scanning process starts after ten seconds.
RHOTHETA User Manual RT-800 5.5 SAR-Dialogue The SAR-Dialogue allows direct access to several emergency frequencies as well as the possibility to scan all Cospas-Sarsat frequencies. Furthermore you can start the decoding of Cospas-Sarsat signals.
RHOTHETA User Manual RT-800 5.6 Cospas-Sarsat Decoding Data Content In order to receive a Cospas-Sarsat data pulse and to decode its content, the main frequency has to be adjusted to a Cospas-Sarsat frequency first. This can be achieved manually or, faster, by selecting the frequency directly in the SAR-Dialogue. For decoding, you have to press function key F2 SAR in the main screen, choose the frequency and then press F5 DECODE CP/SS to start the decoding of Cospas-Sarsat signals.
RHOTHETA User Manual RT-800 Bar of progress of remaining waiting period Time span since last received pulse Signal level and squelch level (Auto-Squelch activated) Data content Fig. 19 Cospas-Sarsat data decoding Data Content: • Frame Sync. Ok (normal Cospas-Sarsat Signal) or SelfTest (Cospas-Sarsat Signal in self test mode). The 24 synchronizing bits have been received correctly.
RHOTHETA User Manual RT-800 6 Operating and Adjusting Common operating functions of the RT-800 are done with help of the keys placed around the display. In normal bearing mode the functions will be called up directly by the keys, opening the corresponding dialogue window. Fig. 20 Operating and adjusting Rarely used adjustments or adjustments which are only done once during installation, will be done in the menu-setup (see chapter 7).
RHOTHETA User Manual RT-800 6.1 Reset of the DCU Press key in order to restart the DCU (The system stores the last settings.). Key illumination and the green operating light are activated. The display is still dark and the system is booting the operating software. The starting page shows up, serial numbers and software version of the DF-system are displayed. Display Control Unit: • Software version • Serial number Antenna Unit: • Software version • Serial number Fig.
RHOTHETA User Manual RT-800 6.2 Setting Main Bearing Frequency/Channel Selection of the main bearing frequency in the VHF and UHF air band and the Cospas-Sarsat band is usually done by direct input of the desired frequency. In the maritime radio band the input of the channel number (with related frequency) is usual. Both types of input are to your disposal. The system will accept only inputs within the permitted frequency ranges. 6.2.
RHOTHETA User Manual RT-800 6.2.2 Setting a Main Operating Channel 56 Channels are available in the VHF marine band. (Channel 0 to 28 and channel 60 to 88). • • Open dialogue window using key Channel / Freq. . Select with F3 or F4 Channel . The channel input field is activated. Additionally the display shows a list of all permissible channels. Permissible channels of the system Channel input field Selection of point of reference for duplex channels Fig.
RHOTHETA User Manual RT-800 6.3 Adjusting the Squelch Our surrounding atmosphere contains always a certain electric field strength, designated as "noise". The received noise voltage is varying with frequency and location of the receiver. Signals can only be interpreted reasonably, if their level is above the surrounding noise level. The squelch electronics make it possible to adjust a threshold, below which incoming signals will not be processed.
RHOTHETA User Manual RT-800 Adjusting window for main bearing frequency (here Ch. 02) Adjusting window for emergency frequencies Adjusting window for additional monitoring frequencies Squelch level of corresponding frequency (here 121.650 MHz) Noise level of corresponding frequency (here 121.650 MHz) Automatic adjustment of all active frequencies Deactivation of squelch level of selected frequency (here CH. 02) Activation of Auto-Squelch-Function of selected frequency (here CH.
RHOTHETA User Manual RT-800 • Open dialogue window using key Squelch When opening the dialogue window the system is scanning the signal levels of the surveilling frequencies/ channels and is showing the presently received signal levels and the previously selected squelch levels on the screen of the display. As soon as the noise level of a frequency is getting visible on the display, the squelch level of this frequency may be adjusted. • Select frequency/channel to be adjusted using arrow keys .
RHOTHETA User Manual RT-800 6.3.4 Automatic Squelch For bearing very short signals the correct adjustment of the squelch level is very important. Because noise level varies by time and location, the squelch level must be adjusted continuously. The Auto-Squelch function ensures that the squelch level is always adjusted to a value a little bit above the noise level. If noise level is rising, the squelch level is rising also. As soon as the noise level drops the squelch level is adjusted accordingly.
RHOTHETA User Manual RT-800 6.4 Adjusting Monitoring Operation and ID-only Filtering For monitoring operation the emergency frequency 121.500 MHz is stored permanently in the system. For additional surveillance three more frequencies/channels can be stored in the specified frequency ranges. Each monitoring frequency can be combined with the selective emergency transmitter filtering function ID-only (selective squelch).
RHOTHETA User Manual RT-800 ATTENTION: Please verify correctly adjusted squelch level for set monitoring (see 6.3), for possible noise signals might release alert, thus delaying further monitoring operation. 6.5 Activating Standby Operation • • Open dialogue window using key Monitor / Stdby. . Key F4 PLB will activate PLB standby operation The display gets dark and the emergency frequency 121.500 MHz is further on controlled in the background.
RHOTHETA User Manual RT-800 6.6 Setting Brightness (Dimming) The brightness of the display elements and key illumination may be adapted to surrounding lighting conditions (TFT-displays, LEDs). An integrated photometer is monitoring surrounding brightness and adapts automatically illumination of display and operating elements to lighting conditions (= Automatic-Mode).
RHOTHETA User Manual RT-800 6.6.1 Automatic Adjustment of Brightness of Display and LEDs • • Open dialogue window using key Dimming . Press left key Mode and select option Automatic. • If necessary, readjust automatically set brightness using keys • and function keys F2, F3 and F4. Store setting using key Ok . Fig. 30 Automatic dimming 6.6.2 Manual Adjustment of Display and LED Brightness • Open dialogue window using key Dimming .
RHOTHETA User Manual RT-800 6.7 Setting the Volume (Volume) With this dialogue the volume of the speaker is controlled. The muting function (Mute) will switch off the speaker. An additional testing routine can test the speaker´s function. Adjusting fields volume Activating test function Maximum volume Medium volume Minimum volume Activation of mute function Fig. 32 Dialogue window Volume 6.7.1 Muting the Speaker (Mute) An emergency signal received, the speaker will give a permanent alarm signal.
RHOTHETA User Manual RT-800 6.7.2 Setting Speaker Volume The volume of the speaker can be set infinitely variable. In order to avoid switching off the speaker by mistake, the minimum volume is limited to a value of 10%. NOTE: In order to observe acoustically the setting of the speakers volume when receiving no signal, we recommend to activate the functional test of the speaker at first (see chapter 6.7.3) and to use the received noise signal as a setting reference.
RHOTHETA User Manual RT-800 6.8 Activating Memory / Band function In order to call up quickly frequently used frequencies/channels, training frequencies etc., the DF-system can store and document these frequencies. For each of the four frequency bands an individual list may be provided. Stored frequencies/channels may be provided with own designations and comments, their sequence and position may be changed within the list, and they can be deleted, if necessary.
RHOTHETA User Manual RT-800 6.8.2 Edit Text (of Frequency/Channel) in Storage List • Open dialogue window using key Memory / Band . • • Select option Edit using arrow keys . Select desired frequency band using function keys F1 to F4. The selected list is shown on the display. • . Select desired frequency/channel using arrow keys The selected frequency/channel is marked with a green bar. • Key Ok will confirm the selection. The text input window is opening (see Fig. 37).
RHOTHETA User Manual RT-800 6.8.3 Move a Frequency/Channel within a Storage List By the means of the function "Move", frequencies/channels can be sorted within a list. NOTE: International valid emergency frequencies on position 1 cannot be moved. • Open dialogue window using key Memory / Band . • • Use arrow keys for option Move . Use function keys F1 to F4 to select corresponding frequency band. your list will be shown on the display.
RHOTHETA User Manual RT-800 6.8.5 Store a new Frequency/Channel in a Storage List • Open dialogue window using key Memory / Band . • • Select option New using arrow keys . Function keys F1 to F4 select desired frequency band. The up to now provided list will be shown in the display. • • Open dialogue window using key Ok in order to put in the frequency/channel. Proceed as described in 6.2.1 (frequency) or in 6.2.2 (channel).
RHOTHETA User Manual RT-800 7 Menu (Setup) All system settings, exceeding common operation of the DF-system (interface settings, offset setting…) will be made in the "Menu Setup”. ATTENTION: Incorrect settings in the Menu setup may lead to considerable malfunctions of the DF-system RT-800. Therefore, sensitive parameters concerning the bearing operation are password protected against non authorized alterations.
RHOTHETA User Manual RT-800 7.1 Menu General Editable freely, uncritical settings: Menu - Setup General Audio Beeper Key Pressing Fig. 39 Menu General, table default settings 7.1.1 Audio As a standard, there is a short beep when pressing a key. If the beep is to be suppressed, deactivate setting "Beeper Key Pressing“.
RHOTHETA User Manual RT-800 7.2 Menu Interface Settings, concerning data interfaces and functions, can be made in menu "Interface" (password protected) Menu - Setup NMEA Std Sentence NMEA mode Interface NMEA baud rate Compass source $PRHO,DFSTD $PRHO,DFVTS $DFBRG Only On Request Autotalk 2 sec Autotalk 1 sec Autotalk 500 ms Autotalk 250 ms 1200 Baud 4800 Baud 9600 Baud 19200 Baud 38400 Baud 57600 Baud 115200 Baud No ext.
RHOTHETA User Manual RT-800 7.2.3 NMEA baud rate NMEA baud rate will set velocity of data transmission of serial NMEA interface (input and output). For further information refer to “RT-500-M & RT-800 NMEA-Protocol Description”. 7.2.4 Compass Source An external compass may be connected to the systems NMEA interface. Set here data format of connected compass. No external compass connected, select menu item „ No ext. Compass (Off)“. Select corresponding data format of external compass here.
RHOTHETA User Manual RT-800 7.3 Menu System Internal system settings (password protected) ATTENTION: Faulty settings may lead to misfunctions of the system. Menu - Setup Address ID [00] Antenna Unit Mounted Upside Down Audio Line Output [50]% Antenna Offset [000]Deg PS RAM Compass Compens.
RHOTHETA User Manual RT-800 exactly to north, the deviation correction can be put in here. The offset is adjustable from 0° to 359° (e.g. -15° = 345°). 7.3.5 PS Ram An external compass connected, the bearing value determination is done by a special, improved compensating procedure. For a compass of minor quality (e.g. heavy and quick variations) it may be necessary, to switch off the compass compensation. Select „ Compass Compens. Off“. 7.3.
RHOTHETA User Manual RT-800 7.4 Menu Service Internal settings and service dialogues (password protected): Menu - Setup Monitor Antenna Unit Password Change Fig. 42 Menu Service table 7.4.1 Monitor The Setup Menu item "Service-Monitor" is to be opened only for service and maintenance operation. Changes of settings are reserved to the firm RHOTHETA or instructed persons. 7.4.2 Password If the system has been unlocked by the default password during first installation (see 7.
RHOTHETA User Manual RT-800 7.5 Unlocking Setup Settings ATTENTION: Wrong or faulty settings in setup menus as "Interface", "System" and "Service" may lead to dysfunctions. These settings are password protected. Before starting to change these settings, password protection has to be released. If the setting procedure is interrupted by pressing key Esc , password protection is automatically enabled again. The blocked menu setting is indicated by a closed grey padlock.
RHOTHETA User Manual RT-800 8 Interfaces 8.1 Overview 1 2 3 4 5 6 7 8 Fig. 43 Overview of Interfaces Pos.
RHOTHETA User Manual RT-800 8.2 Device Ports 8.2.1 Antenna Unit Port (Connecting Cable DCU Contact / Pin AU) Signal 3 +24 V DC 8 Output power supply to Antenna Unit 5 GND 9 1 RS485 A 6 RS485 B 2 NF Connecting cable DCU Serial data connection DCU AU (9600 Baud / semi-duplex / receive and transmit) Input audio signal resp. analog Test/Service AU RHOTHETA Art. No. X-1067 Connection Antenna Unit Connector type: RHOTHETA connecting cable 6-poled with shield length 1 to 100 m: 2 6 x 0.
RHOTHETA User Manual RT-800 8.2.2 GPS / RS422 Port This optional (Build-To-Order Option) input is used to connect an external GPS-device to set the internal system clock. This is required for synchronisation of the bearing values if several direction finders are connected together by a command and control center. Contact / Pin Signal 6 RS422 Rx / A 1 RS422 Rx / B 5 GND 9 +24V DC Input of serial GPS data with RS422 level Output power supply for external GPS 8.2.
RHOTHETA User Manual RT-800 8.
RHOTHETA User Manual RT-800 8.4 Power Supply Item / Pin 1 Marking N (Neutral) 2 PE (protective earth) 3 L (Line) 4 Built-In Fuse (replaceable) IEC 60320 / C14 inlet for use of power cords with IEC 60320 / C13 plugs. 115 – 230 Volts / 1.0 – 0.
RHOTHETA User Manual RT-800 8.5 Service & Maintenance Ports 8.5.1 Power Supply and Optional Connections Contact / Pin Signal 15 +12 V to +30 VDC 8 GND (Ground) 7 Permanent Operation ATTENTION: No connections required (internally connected)! 14 PTT / SBS 6 GND Optional input in order to suppress self bearing.
RHOTHETA User Manual RT-800 8.5.2 NMEA Bus (RS 232) This is an additional NMEA interface of the DCU.
RHOTHETA User Manual RT-800 8.5.3 Test / Program Port for service or test operation (Software and new firmware upload).
RHOTHETA User Manual RT-800 9 Guideline for optimal DF antenna position The quality of the bearing results depends largely on the position of the antenna. So, an antenna position has to be found, where the transmitter´s wavefield can reach the bearing antenna as undisturbed as possible. If high bearing accuracy is demanded, no metallic resp. RF-conducting obstacles shall be around the antenna unit (in an angle of ± 45° towar ds the horizontal).
RHOTHETA User Manual RT-800 10 Technical Data Sheet 10.1 Electrical Characteristics Method of bearing: Doppler-principle (3 kHz rotational frequency, right / left rotation, CW/CCW) Bearing indication: Relative bearing and true bearing related to North (if external heading data available) Bearing accuracy1: ±2° RMS Internal resolution: 1° Sensitivity: HF-voltage at receiver input (50 Ω): VHF, UHF <100 nV; Cospas-Sarsat 406.000 MHz <150 nV Stability of frequency: ±2.
RHOTHETA User Manual RT-800 Signal filtering: Optional: all emergency frequencies can be filtered for ELTmodulation (false alarms disabled). Cospas-Sarsat analysis: Bearable modulation: Reception and analysis of Cospas-Sarsat data signal (112 or 144 bit, 400 baud, biphase L-phase modulated, with BoseChaudhuri-Hocquenghem error correction code, specified according Cospas-Sarsat C/S T.
RHOTHETA User Manual RT-800 10.2 Mechanical Characteristics 10.2.1 DCU Dimensions (built-in version) Measuring units: [mm] millimeters Fig.
RHOTHETA User Manual RT-800 10.2.2 DCU Dimensions (tabletop version) Measuring units: [mm] millimeters Fig. 47 RT-800, mechanical dimensions (tabletop version) 10.2.3 DCU Data Weight Approx.
RHOTHETA User Manual RT-800 10.2.4 Antenna Unit Dimensions Measuring units: [mm] millimeters ca.475 ca.810 397 333 201 157 Fig.
RHOTHETA User Manual RT-800 10.2.5 Antenna Unit Mast Flange Measuring units: [mm] millimeters 120 105 50 40.7 6.3 10 65 90 Fig. 49 Antenna Unit, mast flange (mechanical dimensions) 10.2.6 Technical Data Antenna Unit 2 Weight Approx. 5200 g Permitted operating temperature -40 °C 2 to +60 °C Permitted storing temperature -55 °C to +80 °C Ingress protection IP 67 Temperatures below –10°C resp.
RHOTHETA User Manual RT-800 11 Maintenance and Cleaning Cleaning RHOTHETA Elektronik recommends cleaning the RT-800 with warm water and a microfiber cloth. Persistent stains can be washed with a dishwashing detergent. Do not use any abrasives or cleaning agents containing alcohol.
RHOTHETA User Manual RT-800 12 Product Disposal 12.1 Disposal within the European Union Product Disposal Product labelling according to EN 50419 At the end of product life, this product may not to be disposed together with normal household waste. Even disposal via the municipal waste disposal collection for electrical and electronic equipment is not permitted.
RHOTHETA User Manual RT-800 13 Appendix 13.1 Error Messages Error message Error location Cause Error 01 AU No Receiver Error 04 AU Rec.
RHOTHETA User Manual RT-800 13.3 Frequencies of channels on maritime band Channel No.
RHOTHETA User Manual RT-800 13.
