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R.V.R. Elettronica PTX-LCD User Manual

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PTX - LCD
User Manual
Volume 1
Manufactured by
Italy

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Summary of Contents for R.V.R. Elettronica PTX-LCD

  • Page 1 PTX - LCD User Manual Volume 1 Manufactured by Italy...
  • Page 2 Limitations of use can apply in respect of operating freuency, transmitter power and/or channel spacing. Declaration of Conformity Hereby, R.V.R. Elettronica SpA, declares that this FM transmitter is in compliance with the essential requirements and other relevant provisions of Directive 1999/5/EC.

  • Page 3: Table Of Contents

    PTX-LCD Table of Contents 1. Preliminary Instructions 2. Warranty 3. First Aid 3.1 Treatment of electrical shocks 3.2 Treatment of electrical Burns 4. General Description 5. Quick Guide - Installation and Use 5.1 Using the encoder 5.2 Preparation 5.3 Operation 5.4 Calibration...
  • Page 4 PTX-LCD 13. Operating principles 13.1 Power Supply 13.2 Audio mainboard 13.3 Audio Inputs 13.4 Coder 13.5 PLL/Driver card & VCO Card 13.6 Power amplifier 13.7 Panel Card 13.8 CPU card (16-bit) 13.9 Telemetry card “SLTELEM00001” (optional) 13.10 Telemetry card “SLTELEM00002” (optional) 13.11 AUDINP-DIG Card (option)

  • Page 5: Preliminary Instructions

    2. Warranty R.V.R. Elettronica SpA Via del Fonditore, 2/2c Any product of R.V.R. Elettronica is covered by a 24 40138 BOLOGNA (twenty-four) month warranty. ITALY Tel. +39 051 6010506 For components like tubes for power amplifiers, the 3.

  • Page 6: Treatment Of Electrical Burns

    PTX-LCD • Do not break blisters, remove tissue, remove • clear out mouth if necessary and observe for adhered particles of clothing, or apply any breathing salve or ointment. • if not breathing, begin artificial breathing • Treat victim for shock as required.

  • Page 7: General Description

    87.5 to 108 MHz frequency band, with 10 kHz steps. Other frequency ranges are available on request. The PTX-LCD output power ranges from 0 W up to 30, 60 or 100 W for the PTX30LCD, PTX60LCD and PTX100LCD, respectively.

  • Page 8: Quick Guide - Installation And Use

    PTX-LCD 5. Quick Guide - Installation and Use This chapter gives a concise view of the points that are necessary for the installation of the device. If any item is not completely clear, for example when you use the exciter for the first time, we strongly suggest to read throughly the manual and the description of the operating system.

  • Page 9: Preparation

    Connect to the RF output of the exciter a proper load (a dummy load with suitable dissipation power, an antenna, a final amplifier or a combiner). NOTE: When you connect the PTX-LCD to other devices, it is necessary to strictly follow the instructions given by the resepective manufacturers, to avoid damages or danger situations.

  • Page 10: Operation

    Correct grounding is essential both for safety and to reach the rated performances. Connect your source audio (for example the mixer or STL output) to the suitable input connector. Depending on the version, the PTX-LCD offers a number of input choices, L+R, MPX or even digital; see the connectors description for details.

  • Page 11: Calibration

    If RF power output was disabled, you may now enable it from the MAIN menu as follows: select the first item and change setting from OFF to ON. The RF power output of the PTX-LCD may be disabled from the main menu at any time.
  • Page 12 Perform the connections shown in figure 5-3. The cable to connect the two equipments is available from R.V.R. Elettronica on request, or the user may ask a skilled technician to provide a cable to match the pinout of the amplifier used.
  • Page 13 PTX-LCD Turn the EXT AGC - FWD trimmer clockwise until the reading of amplifier output power begins to decrease. Set exciter power to minimum setting. Disconnect the dummy load from the amplifier and replace it with a mismatch load so that part of the output power is reflected back and set amplifier meter to measure reflected power.

  • Page 14: External Description

    PTX-LCD 6 External Description This section describes the components found on the front and rear panel of PTX- LCD. 6.1 Front Panel 9 10 11 1 2 3 4 Figure 6-1 [1] ON Indicates that exciter is switched on [2] ON AIR...

  • Page 15: Rear Panel

    PTX-LCD 6.2 Rear Panel 13 14 10 11 Figure 6-2 [1] PLUG Mains power plug [2] 24Vdc IN Connectors for external 24V power supply (option). Positive (red) and negative (black) [3] P.A. Fuse Protection fuse of RF final stage [4] INTERLOCK...

  • Page 16: Rear Panel - Audinp-Dig Option

    PTX-LCD 6.3 Rear Panel - AUDINP-DIG option 12 13 Analogue section [1] Left (Mono) XLR connector for Left / mono input [2] Right (MPX BAL) XLR connector for Right / MPX input [3] Monitor BNC connector for composite signal monitoring...

  • Page 17: Rear Panel - Trdsp Option

    PTX-LCD 6.4 Rear Panel - TRDSP option [1] SCA1 Input connector, BNC type [2] SCA1 lvl. SCA1 level trimmer [3] SCA2 SCA2/DARC input connector, BNC type [4] SCA2 lvl. SCA2/DARC level trimmer [5] SCA3/RDS SCA3/RDS input connector, BNC type [6] SCA3/RDS lvl.

  • Page 18: Rear Panel - Gsm Option

    PTX-LCD 6.5 Rear Panel - GSM option Figure 6-3 [1] FUSE Power supply fuse and voltage selection block [2] TELEMETRY DB25 connector of telemetry card (option) [3] RS232 DB9 connector for direct serial communication or modem [4] MODEM DB9 connector connected to GSM modem...

  • Page 19: Connectors Description

    PIN4 is the FAULT signal input (see Sect. 13.12.1.5), whereas PIN11 is the MAINS FAULT signal input. 6.6.2 RS 232 Type: Female DB9 TX_D RX_D +12V Note: Normally, PTX-LCD serial communication is configured as DCE (Data Communication Equipment). User Manual Rev. 3.1 - 31/08/10 15 / 76...
  • Page 20 PTX-LCD 6.6.3 Left (MONO) / Right (MPX Bal) Type: female XLR Positive Negative 6.6.4 Telemetry “SLTELEM00001” Opt. Type: Female DB25 +12V relay 1, normally closed contact relay 2, common contact IIC clock IIC data open collector output telemetry analogue input 1...
  • Page 21 PTX-LCD 6.6.5 Telemetry “SLTELEM00002” Opt. Type: Female DB25 N.C. Audio Auto (Meldung) Audio Auto (Kommando) Audio Digital (Meldung) N.C. ON (Kommando) Power Good 1 (Meldung) Warten (Meldung) Audio Digital (Kommando) Off (Meldung) RF Enable (Kommando) SWR (Meldung) Reserved Audio Analogue (Kommando)

  • Page 22: Operating System

    If no controls are operated during 5 seconds, or if the encoder is pressed, the exciter goes to the main screen (MAIN). 7.2 Operating System The PTX-LCD menu system consists of a default menu and set of administration menus. The figure below provides an overview of the menu system.
  • Page 23 PTX-LCD 5) 6WDWXV 0DLQ V $PSOL )3ZU : 6XSSO 5) 6WDWXV 0DLQ 53ZU : ([3ZU ([6WV )UHT 0K] 0 ([)UT $WW  G%X 7HOHP 038 X &/2II 3O2Q 5) $PSOLILHU 0DLQ ,19 9 $PSOL 3$9 9 6XSSO 5) $PSOLILHU $PSOL ...
  • Page 24 PTX-LCD %RDUG 6HW ([6WV 0RGDQO 03; 8 ([)UT %RDUG 6HW %G6HW 3UHHPSK XV 7HOHP &OLSSHU 6&$ ,PSHG   .RKP $X6HW 6FDOH ,$0/& %G6HW 038 X &/2II 3O2Q 6WHUHR 6HW ([)UT 3LORW 7HOHP &KDQSK 6&$ 6WHUHR 6HW 6W6HW $X6HW ,$0/&...
  • Page 25 PTX-LCD 7.2.1.2 Status Bar This "status bar" relates to certain settings that can be modified from the administration submenus; these settings are discussed in greater detail further below. • Audio operating mode: Stereo/Mono/MPX_U/MPX_B Preemphasis: 0, 25, 50, 75 microseconds Clipper feature, On or Off...
  • Page 26 PTX-LCD 7.2.2 Administration menu 7.2.2.1 RF Status RF Status Main. 10s Ampli FPwr: 0.0W 0% Suppl RPwr: 0.0W ExPwr ExSts Freq: 87.500Mhz 0M ExFrq Att : 0dBu Telem MPU 50u CLOff Pl.On RF power output On / Off. Reading and setting of time taken by the PTX- LCD to reach set power;...
  • Page 27 PTX-LCD 7.2.2.2 RF Amplifier This is an information screen; it shows amplifier voltage, current and temperature values, which cannot be modified. 5) $PSOLILHU 0DLQ ,19 9 $PSOL 3$9 9 6XSSO 3$, $ ([3ZU 7(03 & ([6WV 99&2 9 ([)UT 7HOHP 038 X &/2II 3O2Q...
  • Page 28 RPwr: ExPwr ExSts ExFrq Telem MPU 50u CLOff Pl.On Status indicator, command relates to the PTX-LCD mode (MAIN menu). FPWR Forward power supplied by external amplifier expressed in percent. RPWR Reflected power supplied by external amplifier expressed in percent. 7.2.2.5 External Status Monitoring menu for input voltages from a telemetry-equipped equipment.
  • Page 29 0.0% ExFrq _SCA_ MPU 50u CLOff Pl.On The PTX-LCD has three subcarrier transmission inputs named SCA1, SCA2 and RDS. This menu shows the modulation level achieved by each input both in kHz and in percent. User Manual Rev. 3.1 - 31/08/10...
  • Page 30 PTX-LCD 7.2.2.8 Audio Set Audio settings: channels on/off and level adjustment. Audio Set Suppl Mono/L: 0dBu ExPwr MPX /R: 0dBu ExSts Mono/L: ExFrq MPX /R: Telem Auset MPU 50u CLOff Pl.On MONO/L Setting of audio input level on MONO channel (left channel if stereo version).
  • Page 31 PTX-LCD The IAMLC feature of the PTX-LCD controls modulation level by adjusting input level without the use of limiters or compressors. When mean modulation remains over the set maximum threshold for a period of time greater than set maximum hysteresis time, input level is attenuated by 1 dB.
  • Page 32 PTX-LCD The figure provides an example of the mean modulation level trend when the IAMLC feature is available. Ist Max Ist Max 1 dB 1 dB Mod Max Ist min Mod min Time 7.2.2.10 BoardSet Modulation mode configuration %RDUG 6HW ([6WV 0RGDQO 03;...
  • Page 33 Mains: AlmSt MPU 50u CLOff Pl.On Setting of the PTX-LCD forward power alarm. Alarm is triggered when output power drops below the set percent threshold for the set time (expressed in seconds). Setting of the PTX-LCD reflected power alarm. Alarm is triggered when output power rises above the set percent threshold for the set time (expressed in seconds).
  • Page 34 (expressed in seconds). AUDIO Alarm setting for audio input signal to the PTX-LCD. Alarm is triggered for the set time. MAINS To handle MAINS alarm, attach jumper no. 10 to JP8 on the PTX- LCD panel board and move the jumpers at JP6 on the power supply card from positions 3-5 and 4-6 to 1-3 and 2-4.
  • Page 35 "StartUp Time" (default setting is 60 seconds); after this delay times out, an INFO SMS on the PTX-LCD operation state is transmitted. The "StartUp Time" delay also applies to MAINS alarm; on start-up, the PTX-LCD will wait for the set time before sending an INFO SMS.
  • Page 36 PTX-LCD MODEM Configures machine to use a modem (Present), for direct cable connection, (Absent), GSM and Pager. MODE Local: The machine will not accept changes to parameters from external devices. Remote: Enables remote setting of machine parameters. 7.2.2.15 Information This menu provides general information on the exciter.
  • Page 37 PTX-LCD (Stand by), CKSMS (Check SMS), TXSMS (Transmission SMS). Name Name of SIM card service provider. The value right below the name is the set service centre number. Retry SMS transmission attempts indication. Maximum number of SMS's the SIM card can store.

  • Page 38: System Status Enquiries

    PTX-LCD 8. System Status Enquiries 8.1 Local enquires Locally, PTX-LCD provides status indications through the front panel lights, whereas more detailed information is available in the setup and configuration menu. 8.2 Remote enquiries using remote control software (Opt.) Using a PC with the "TELECON" telemetry and remote control software installed, the user can get an accurate picture of all system operating parameters and all device settings (including connected equipments).
  • Page 39 Note: The DELAY and STEP commands are only available if the optional TRDSP card is installed Note: For PTX-LCD to actually process the reply or requested command, the GSM number used to send the request must be stored in the list of numbers set in PTX- LCD.

  • Page 40: Remote Alarm Reporting And Control (Opt.)

    PTX-LCD 9. Remote Alarm Reporting and Control (Opt.) The Remote Alarm Reporting and Control service is activated when the PTX-LCD is supplied in one of the following configurations: Radio Modem Box (telemetry interface); • External GSM modem; • Internal GSM modem (/GSM option).
  • Page 41 "LOCAL" mode, or you will be getting alarm indications during the whole setting procedure (see PTX-LCD Manual, Volume 1, Section "Alarm Config"). If the Radio Modem Box is connected to a PTX-LCD, alarm time factory settings are as follows: MAINS:...
  • Page 42 15) Connect the GSM modem antenna to connector "N" of the Radio Modem Box. Use a broadband Yagi log-periodic directional antenna (700-900 MHz). 16) Select modem as "GSM" in PTX-LCD settings and set Baud Rate to 9600. Follow the instructions provided below closely to ensure correct configuration of TLC/ SCM connection: Open the Radio Modem Box.

  • Page 43: Remote Alarm Reporting Configuration

    Firstly, you will have to programme certain the PTX-LCD parameters using the "TELECON" software. To this end, connect the PC serial port COM to the RS232 connector on the PTX-LCD rear panel using a standard Male DB9 - Female DB9 serial cable.
  • Page 44 PTX-LCD Double click the green label in the top left corner of the TELECON screen and select "Eeprom" (as shown in the figure below). 40 / 76 Rev. 3.3 - 31/08/10 User Manual...
  • Page 45 PTX-LCD In the open menu, press this key to view station parameters. Select the "General" data category and set the 5 parameters: • STATION ID: station identifier; • STATION NAME: (max 18 characters); • DIAL STRING: required setting for a GSM modem is ATDT;...
  • Page 46 PTX-LCD Now select the "Telephone" data category and set the following: PHONE NUMBER: GSM phone numbers recognised by the station to which you • want the alarms sent; SMS: select "YES" to enable transmission of SMS commands to system; •...
  • Page 47 STATUS: Enable Enable Alarm reporting enable DIsable Disable Alarm reporting disable When all parameters are set, press this key and the PTX-LCD will store the information. When finished, click "Exit" to exit the remote station programming window. Back into "TELECON" standard interface, click the "General" measurement selection button to set thresholds and operation times for the various alarms according to the principles outlined in Section "Alarm Management".

  • Page 48: Remote Control

    PTX-LCD Note: When the configurations are completed, do not forget to connect the GSM modem to the PTX-LCD using the supplied cables; the following block diagram and picture are for your reference: 9.3 Remote Control All PTX-LCD parameters can be monitored on a PC with a suitable modem connection.

  • Page 49: Internal Modem (Option /Gsm)

    With this option, all operations listed above can be performed via the modem built into the exciter. When the configurations are completed, do not forget to connect the integrated GSM modem to PTX-LCD using the supplied cable as shown in the picture: User Manual Rev. 3.1 - 31/08/10...
  • Page 50 PTX-LCD Note: The RS232 and MODEM connectors are connected to each another by factory. However, they may also be used independently (for example, RS232 connector for factory parameter programming and MODEM connector for GSM modem connection to PC). 46 / 76 Rev.

  • Page 51: Technical Specifications

    PTX-LCD 10. Technical Specifications 10.1 Mechanical Specifications Panel size 483 mm (19”) x 88 mm (3 1/2”) (2 HE) Depth 344 mm (26 1/2”) Weight PTX30 13 Kg PTX60 15.5 Kg PTX100 15.5 Kg -10 °C ÷50 °C Operating temperature 10.2 Electric Specifications...

  • Page 52: Mono Operation

    PTX-LCD Preemphasis selectable: 25 us 50 us (CCIR) 75 us (FCC) SCA/RDS inputs 3 unbalanced BNC connectors SCA input impedance 10 KOhm -20 dBm ÷ +10 dBm, adjustable by trimmer SCA input level SCA amplitude/frequency response ± 0.2 dB, from 40 KHz to 100 KHz...
  • Page 53 PTX-LCD Remote connections Remote connector Female DB15 type; provides: FWD and RFL inputs for external AGC 6 analogue or digital inputs 2 relay digital outputs Interlock connector BNC, for power disable C interface Serial interface Female DB9 RS232, DTE or DCE selectable...
  • Page 54 PTX-LCD MPX OUTPUT D/A conversion 24 bit Pilot Tone 19 KHz ±0.5 Hz Pilot level Selectable Pilot phase Selectable Subcarrier attenuation 38 KHz min. -90 dB MPX output level Selectable Stereo separation 65 dB, 30 Hz - 15 kHz MPX output noise...

  • Page 55: Factory Settings

    PTX-LCD 11. Factory Settings Each time a change is made to a PTX-LCD parameter, the new setting is added to machine configuration information, which is stored in a non-volatile memory area. On switch on, the exciter will retain the same configuration it had been using before the last switch off.
  • Page 56 PTX-LCD Same as CCIR, except: Parameter Menu Value Preemphasis Admin->BdSet->Preenph 75 μs Mode of operation Admin->BdSet->Mode Stereo (if stereo coder is present) Mono (if stereo coder is not present) OIRT Same as CCIR, except: Parameter Menu Value Minimum frequency 66.0 MHz Maximum frequency 74.0 MHz...

  • Page 57: Module Identification And Access

    PTX-LCD 12. Module Identification and Access 12.1 Module identification The figure shows a top view of machine inner components. Component descriptions are listed below. [1] Audio Input card [2] Stereo Coder or mono card [3] RF power amplifier [4] Audio mainboard [5] PLL &...

  • Page 58: How To Access Modules

    PTX-LCD 12.2 How to access modules WARNING: Dangerous voltages or currents inside! Be careful when opening the device. Always disconnect power supply before removing the covers or any device component. Remove all screws on the top cover of the machine. Remove the cover and refer to the block diagram to identify and locate all exciter components.

  • Page 59: Operating Principles

    PTX-LCD 13. Operating principles The figure below provides an overview of the PTX-LCD modules and connections. Following is a brief description of the different module functions. User Manual Rev. 3.1 - 31/08/10 55 / 76...

  • Page 60: Power Supply

    PTX-LCD 13.1 Power Supply There are two separate power supply sections. A first section provides power supply for power final stage. It consists in a switching power supply unit mounted on a cooling fin. The second section consists in a card mounted on a heat sink located centrally in the machine.

  • Page 61: Audio Mainboard

    PTX-LCD PA maximum current adjustment forward power measurement adjustment reflected power measurement adjustment driver current measurement adjustment 1-3, 2-4 the pins on the remote connector are used as analogue inputs 3-5, 4-6 the pins on the remote connector are used for IIC communication 13.2 Audio mainboard...
  • Page 62 PTX-LCD After the necessary elaboration (filtering, level adjustment, selection), the audio input section passes the signals on to the audio mainboard, that routes them to the coder card. -3 -3 -3 13.3.1 Adjustments, settings and indicators on: power supply negative voltage present...

  • Page 63: Coder

    PLL & Driver card. This card comes in two versions, namely Stereo and Mono/MPX. The only difference between a Stereo PTX-LCD and a Mono/MPX PTX-LCD lies in the coder module. Depending on the version, this card accommodates the low-pass filters, the preemphasis circuits, the stereo coder and the Clipper circuit, which may be enabled or disabled via software.

  • Page 64: Pll/Driver Card & Vco Card

    13.5 PLL/Driver card & VCO Card The PLL/Driver card is located on the left side of the PTX-LCD and is plugged into the audio mainboard. The digital PLL module consists of a high-stability oscillator with temperature control and a digital circuit that divides and compares operating frequency.

  • Page 65: Power Amplifier

    PTX-LCD 13.5.1 Adjustments, settings and indicators on: PLL not locked bias adjustment factory setting - do not alter factory setting - do not alter factory setting - do not alter 13.6 Power amplifier The power amplifier is available in a 30W and a 60/100W version.

  • Page 66: Panel Card

    13.7 Panel Card This card is located in the front end of the device and provides an interface between the CPU card and the remaining PTX-LCD cards. This card handles all signals from/to LCD, Encoder, LED Indicators, Power Supply Card, Audio Mainboard and external telemetry card, in other words, all input/output signals of the CPU card.

  • Page 67: Cpu Card (16-Bit)

    PTX-LCD Jump Jump Jump Jump Jump Jump Jump Jump Jump Jump Meaning ExPwr, ExSts and ExFrq menu disabled ExPwr and ExSts menu enabled, ExFrq menu disabled ExPwr and ExSts menu disabled, ExFrq enabled ExPwr, ExSts and ExFrq disabled Default parameters set in case of exciter reset:...

  • Page 68: Telemetry Card "Sltelem00001" (Optional)

    PTX-LCD The card requires no settings or adjustments. 13.9 Telemetry card “SLTELEM00001” (optional) This card has a female DB25 connector that can be accessed on the machine rear panel. This card provides 8 programmable customized alarms that are discussed in paragraph 9.1.
  • Page 69 PTX-LCD 13.9.1 Telemetry This optional menu displays the state of the optional add-on telemetry card. Telemetry Ampli T1:0.3V T7:0.3V Suppl T2:0.3V T8:0.3V ExPwr T3:0.3V R1: Off ExSts T4:0.3V R2: Off ExFrq T5:0.3V VB:0.0 T6:0.3V Out: Off Telem MPU 50u CLOff Pl.On If the telemetry is not fitted, displayed values are not applicable.

  • Page 70: Telemetry Card "Sltelem00002" (Optional)

    TC/TS MPU 50u CLOff Pl.On Power This line provides a settable software limit for the PTX-LCD maximum output power. Available options are "100 W" (no limit) and "30 W" (maximum PTXLCD output nearly 30 W). Threshold level for "Power good 1" signal. Level is expressed in percent of set power level.

  • Page 71: Audinp-Dig Card (Option)

    1201. 13.11.1 Functions description The optional section is located in the PTX-LCD rear panel and is connected directly to the audio mainboard via a strip line connector. It includes three different cards. The system provides for twelve cyclic system queries that enable quick fault location.
  • Page 72 PTX-LCD The first card contains the balanced analogue inputs and the level trimmers for all analogue inputs and their filters; this is the same card used in PTX-LCD without AUDINP-DIG. The second card accommodates level adjustments and the software- based audio configuration switches. The third section helps convert the digital signal to "Left"...
  • Page 73 PTX-LCD JP11 JP12 JP10 User Manual Rev. 3.1 - 31/08/10 69 / 76...

  • Page 74: Trdsp Card (Optional)

    The TRDSP option includes two electronic cards and a support panel with the input and output connectors. This subassembly is installed into PTX-LCD in place of the audio input and stereo coder sections (or Mono/MPX card). It can be easily retrofitted to standard PTX-LCD exciters.
  • Page 75 PTX-LCD The block diagrams of a standard PTX-LCD exciter and a PTX-LCD equipped with TRDSP are compared in the figure below, with special regard to the input card. 6WDQGDUG LQSXW VHFWLRQ RDS/SCA1 SCA2 SCA3 Σ 9&2 MPX unb MPX (BNC)
  • Page 76 PTX-LCD 13.12.1 Operating system and TRDSP When TRDSP is installed, new screens are added to the administration menu to handle the key operating parameters of the card. 13.12.1.1 RF Status RF Status Main. 10s Ampli FPwr: 0.0W 0% Suppl RPwr: 0.0W...
  • Page 77 5.47 milliseconds. The actual time delay set is shown under item "Totdly"; it is expressed in microseconds up to a maximum value of 9981,35ms. If PTX-LCD is interfaced with a GSM modem, parameter DELAY can be set via SMS. User Manual Rev.
  • Page 78 PTX-LCD Two SMS commands are available: DELAY and STEP. DELAY is used to set delay in microseconds. For example, message "DELAY 624" would set delay to 624 ms (with some minor approximation). STEP is used to make corrections in steps of 0.05 ms each (+ or - ).
  • Page 79 L/R max Maximum audio level operation threshold in the Mono/Stereo mode; A.G.C. kicks in when threshold is exceeded; range is 0 to +12 dB. 13.12.1.5 Isofreq Setup menu for PTX-LCD isofrequency mode operating parameters. TrDsp IsoFreq StSet TrDsp t.act: 0min AlmSt TrDsp t.rec:...
  • Page 80 "low FWD Power" alarm is active, an SMS message that reads "ALARM: low FWD power - Out of Sync" is transmitted. 13.12.1.6 FSK The PTX-LCD operating parameter setup menu for FSK signalling, in which a Morse- coded 6-character alphanumeric code is sent at regular intervals using transmission frequency shift.

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