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

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PTX - LCD
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User Manual
Volume 1
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Italy

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

  • Page 1 PTX - LCD 8 bit Version 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 5.1 Using the encoder 5.2 Preparation 5.3 Operation 5.4 Calibration 6 External Description 6.1 Front Panel...
  • Page 4 PTX-LCD This page was intentionally left blank Rev. 2.3 - 18/07/07 User Manual...

  • Page 5: Preliminary Instructions

    R.V.R. Elettronica SpA does not assume responsibility for injuries to persons or damage to items caused by improper use or incorrect usage procedures, whether the users are experienced or not.
  • Page 6 PTX-LCD This page was intentionally left blank 2 / 58 Rev. 2.3 - 18/07/07 User Manual...

  • Page 7: Warranty

    PTX-LCD 2. Warranty The guarantee, which is for 24 (twentyfour) months, is valid for any R.V.R. Elettronica product. On components such as tubes for final amplifiers, the manufacturer’s guarantee applies. R.V.R. Elettronica extends all transferable original guarantees to its own products.
  • Page 8 PTX-LCD Replacement of parts under guarantee or spare parts can be ordered from the following address: R.V.R. Elettronica SpA Via del Fonditore, 2/2c 40138 BOLOGNA ITALY Tel. +39 051 6010506 quoting type, model and serial number of the device. 4 / 58 Rev.

  • Page 9: First Aid

    PTX-LCD 3. First Aid Personnel involved in the installation, use, and maintenance of the equipment must be familiar with the theory and practice of first aid. 3.1 Treating electric shocks 3.1.1 If the victim is inconscious Follow the first aid principles described below.

  • Page 10: Treatment Of Electrical Burns

    PTX-LCD • Do not interrupt the cardiac massage during the artificial respiration. • Call a doctor as soon as possible 3.1.2 If the victim is conscious • Cover the victim with a blanket • Keep him calm. • Loosen the victim’s clothes and keep him lying down •...

  • Page 11: General Description

    PTX-LCD 4. General Description The PTX-LCD is a 19" rack-mountable frequency agile FM exciter. Its frequency range spans from 87.5 to 108 MHz in 10 kHz steps, but other frequencies are available on request. The PTX-LCD comes in three versions, depending on its maximum output power: 30 W for the PTX30-LCD version, 60 W for the PTX60-LCD version and 100 W for the PTX100-LCD version, on a 50 Ohm load.
  • Page 12 PTX-LCD This page was intentionally left blank 8 / 58 Rev. 2.3 - 18/07/07 User Manual...

  • Page 13: Quick Guide

    PTX-LCD 5. Quick Start 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 14: 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 15: Operation

    This operation is necessary only if one wants to modify the device’s settings before starting transmitting. Using the menu system provided by the PTX-LCD, described in chapter 7, it is User Manual Rev. 2.3 - 18/07/07...

  • Page 16: Calibration

    If you disabled the power output, it is now possible to activate entering in the main menu, selecting the first item and changing it from OFF to ON. It is any time possible to disable the power output of the PTX-LCD, from the main menu.
  • Page 17 FM range, and to limit the reflected power of the amplifierso that the its protection system doesn’t intervene. To adjust the EXT AGC trimmers of the PTX-LCD, procced as described in the following. Perform the connections described in figure 5-3. The connection cable can be supplied on request by R.V.R.
  • Page 18 PTX-LCD read a reflected power level just above the desired threshold. Turn the EXT AGC - RFL trimmer counter-clockwise until you see the power reflected on the amplifier starting to decrease. At this point, the adjustment of the trimmers is completed. Now you can set on the exciter the output value you desire, without the forward or reflected power of the amplifier surpass the set thresholds.

  • Page 19: External Description

    PTX-LCD 6 External Description This chapter describes the elements of the front and rear panels of the PTX-LCD. 6.1 Front Panel 9 10 11 1 2 3 4 Figura 6-1 [1] ON Operating indicator [2] ON AIR indicates that the exciter is transmitting...

  • Page 20: Rear Panel

    PTX-LCD 6.2 Rear panel 13 14 10 11 Figura 6-2 [1] PLUG mains supply plug [2] 24Vdc IN connectors for external 24 V dc supply (optional). Positive (red) and negative (black) [3] P.A. Fuse RF power amplifier protection fuse [4] INTERLOCK interlock BNC connector.: if the central connector is grounded, the exciter is...

  • Page 21: Rear Panel - Audinp-Dig Option

    PTX-LCD 6.3 Rear panel - AUDINP-DIG option 12 13 Analog section [1] Left (Mono) XLR connector for Left/mono input [2] Right (MPX BAL) XLR connector for Right/MPX input [3] Monitor BNC connector to monitor the composite modulating signal [4] 19 kHz pilot BNC connector for pilot tone output, suitable to synchronize external devices (e.g.

  • Page 22: Connectors Description

    If ExPwr is disabled (see 11.7), the meaning of this contact is “SWR alarm”: closed = OK, open = SWR 6.4.2 RS 232 Tipo: DB9 female TX_D RX_D +12V Note: Normally, the PTX-LCD is configured as DCE (Data Communication Equipment) for serial communication. 18 / 58 Rev. 2.3 - 18/07/07 User Manual...
  • Page 23 PTX-LCD 6.4.3 Telemetry (optional board) Type: DB25 female +12V relay 1, NC contact relay 2, common contact clock I data I open collector output (“Out” in Telemetry menu) telemetry analog input 1 telemetry analog input 3 telemetry analog input 5...
  • Page 24 PTX-LCD This page was intentionally left blank 20 / 58 Rev. 2.3 - 18/07/07 User Manual...

  • Page 25: Operating System

    After 5 seconds, or when the encoder is pushed, the software jumps into its main cycle. 7.1.2 EEPROM Re-initialization At start up, the PTX-LCD software check the coherency of the data stored in the non volatile memory (EEPROM) with respect to the software version. A discrepancy will be detected in case software upgrade.

  • Page 26: Operating System

    7.2 Main cycle The menu system of the PTX-LCD can be broken up in a default menu and a set of administration menus. 22 / 58 Rev.
  • Page 27 PTX-LCD Amp/Tm Preset ModPk Menù di scambio (Admin) Predefinito Main Amplifier Power Supply External Power External Status External Frequency Telemetry General Settings Audio Settings Intelligent Automatic Modulation Level Modulation Settings Stereo Settings Figure 7-6 Figure 7-6 depicts the overall flow-chart of the menu system.
  • Page 28 PTX-LCD 7.2.1 Default menu Figure 7-7 To work on a menu item, turn the encoder to select it and then push the encoder. Depending on the item, it could be possible that a new window is opened or that it will be possible to directly modify the parameter.
  • Page 29 PTX-LCD • Reading and setting of the audio input level. The reported value indicates the audio level that generates 100% modulation. Pushing the encoder while the cursor is on this item, will put you through the menu that permits to modify the audio input level setting.
  • Page 30 PTX-LCD INST Visualization method: instantaneous (INST) or average on 300 samples. In instantaneous mode, only the graphic visualization is active. In “300” mode, at the end of the analysis (300 x sample time) the values M, S, % and K will be displayed...
  • Page 31 PTX-LCD • Selecting this menu item and pushing the encoder you will access the window that permits to reset the exciter to the factory settings. Figure 7-13 As indicated by the window text, keeping the encoder pressed for two seconds will reset the exciterand a start-up procedure analogous to that performed at switch-on will follow.
  • Page 32 PTX-LCD If you push the encoder while the cursor is on the name of a submenu, and if this one contains modifiable parameters, the cursors enters in the central part of the window, permitting to edit thos modifiable parameters. Each of the menus of this kind contains an “EXIT” item: pushing the encoder while the cursor is on “EXIT”...
  • Page 33 PTX-LCD 7.2.2.2 Ampli This menu is for information only, no value can be modied, since they show current, voltage and temperature af the amplifier section Figure 7-16 IN.V Input voltage to the power supply PA.V Voltage of the final stage of the amplifier PA.I...
  • Page 34 Figure 7-18 status indicator, related to the status of PTX-LCD (MAIN menu) FPWR forward power of the amplifier, percentage...
  • Page 35 PTX-LCD 7.2.2.6 ExFrq This menu is used to set the alternative frequencies that shall be used when the exciter is used as backup in a N+1 system. This menu can be available or not depending on the jumpers configuration (see 11.7.1).
  • Page 36 In this menu one can read the modulation level due to SCA and RDS input Figure 7-22 In the PTX-LCD there are three input connectors for subcarrier signals, called SCA1, SCA2 and RDS. This menu displays the modulation levels (percentage and kHz) for each of them 7.2.2.9...
  • Page 37 Intelligent Automatic Modulation Level Control. Figure 7-25 The IAMLC functionality provided by PTX-LCD adjusts the modulation level by adaptation of the input level, without the use of limitation or compression. When the average modulation level surpasses the maximum threshold for a time interval exceeding the maximum hysteresis time that has been set, the input level is attenuated by 1 dB.
  • Page 38 PTX-LCD Both the attenuation and the increase that IAMLC is allowed to introduce, have limits that can be set by the user. The elements of this menu are the following: IAMLC Enable or disable the function Minimum and maximum thresholds for the intervention of IAMLC...
  • Page 39 PTX-LCD Ist Max Ist Max 1 dB 1 dB Mod Max Ist min Mod min Time Figure 7-26 7.2.2.12 BdSet Modulation type configuration Figure 7-27 Mode transmission mode selector: MONO, MPX_U (MPX unbalanced BNC input), MBX_B (MPX balanced XLR input), STEREO. The latter option is active only for stereo machines.
  • Page 40 PTX-LCD 7.2.2.13 StSet Stereo coder board configuratio menu (available if the stereo option is installed) Figure 7-8 Pilot0 Pilot tone phase (not available) Pilot Activation/deactivation of the pilot tone (can be useful for certain measurements) Chan0 Phase of the right channel; it can be set to 0 or 180 (signal mirroring, useful for example to measure the “Sub to Main”...

  • Page 41: Technical Specifications

    PTX-LCD 8. Technical Specifications 8.1 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 Temperature range 8.2 Electrical Specifications...
  • Page 42 PTX-LCD -20 dBm ÷ +10 dBm, trimmer adjustable SCA input level SCA amplitude-frequency response ± 0.2 dB, from 40 KHz to 100 KHz Crosstalk from subcarrier 67KHz on 65 dB main or stereo channel Crosstalk from subcarrier 92KHz on 70 dB...
  • Page 43 PTX-LCD Serial interface DB9 female RS232, DTE or DCE selectable RS485 (Optional) DTE or DCE selectable Optional telemetry board DB25 female 8 analaog/digital input 2 digital output C serial interface Options External 24V battery Telemetry interface /AUDIOINP-DIG Digital audio input interface...
  • Page 44 PTX-LCD This page was intentionally left blank 40 / 58 Rev. 2.3 - 18/07/07 User Manual...

  • Page 45: Factory Settings

    PTX-LCD 9. Factory settings Each time a working parameter of PTX-LCD is changed by the user, the new value is stored in the working configuration and saved in a non volatile memory. In this way, at switch-on the exciter is configured exactly as it was when it was last switched off.
  • Page 46 PTX-LCD OIRT Configuration as CCIR, with: Parameter Menu Value Minimum frequency 66.0 MHz Maximum frequency 74.0 MHz Preset frequencies Admin-ExFrq 66.0, 67.00, 68.00, 68.00, 69.00, 70.00, 71.00, 72.00, 73.00, 74.00 MHz Audio mode Admin->BdSet->Mode Stereo (If stereo coder present) Mono...

  • Page 47: Identification And Access To The Modules

    PTX-LCD 10. Identification and access to the modules 10.1 Modules identification Figure 10-1 shows the upper view of the internal of the exciter. The components are described below. Figure 10-1 [1] Audio input board [2] Stereo coder or mono board...

  • Page 48: Access To The Modules

    PTX-LCD 10.2 Access to the modules ATTENTION: opening the device, points with dangerous voltages and currents are exposed. Always disconnect the mains supply before removing the covers or taking away any part of the piece of equipment. Remove all the screws on the upper cover of the exciter. After taking away the cover, identify with the help of figure 10-1, the components of the exciter.

  • Page 49: Working Principles

    PTX-LCD 11 Working principles Figure 11-1 gives an overview of modules and connections composing the PTX-LCD. Figure 11-1 In the following you will find a short description of the functionalities of each module. User Manual Rev. 2.3 - 18/07/07 45 / 58...

  • Page 50: Power Supply

    PTX-LCD 11.1 Power supply The power supply is composed of two sections. The first one is dedicated to the finale amplifier. It is a switch mode power supply fastened to a heat sink (Fig. 10-1 9). In the 30 W version, there is a second switching power supply of the same kind under the first one.

  • Page 51: Audio Motherboard

    PTX-LCD 11.1.1 Adjustings, settings and indicators The switching mode power supply doesn’t need any adjusting, while the power supply board features a number of indicators and adjustable components. lit: fault of the power amplifier fuse lit: fault of PF1 fuse...

  • Page 52: Audio Input

    PTX-LCD 11.2.1 Adjustments, settings and indicators lit: no audio lit: supply voltage OK lit: supply voltage OK lit: supply voltage OK factory setting, please don’t change 11.3 Audio input The audio input section is on the rear part of the exciter and is directly connected to the audio motherboard using a strip-line connector.

  • Page 53: Coder

    PLL/Driver board. Two versions of this boards are available, the Stereo one (Fig. 11-7) and the Mono/MPX one(Fig. 11-8). The only difference between a Stereo PTX-LCD and a Mono/MPX one resides in the kind of coder module.
  • Page 54 PTX-LCD The function of the Clipper circuit, that in some countries is manatory, is to limit the modulation level even for audio input levels above the nominal value. Figure 11-7 Figure 11.8 11.4.1 Adjustments, settings and indicators Stereo Coder Pilot tone phase...

  • Page 55: Pll/Driver Card & Vco Card

    11.5 PLL/Driver card & VCO Card The PLL/Driver board (Fig. 11-9) is placed on the left part of the PTX-LCD (Fig. 10-1 5) and is directly connected to the audio motherboard. The digital PLL module is composed by a high stability temperature-controlled oscillator and by the digital circuit doing the division and the comparison of the working frequency.

  • Page 56: Power Amplifier

    PTX-LCD Figure 11-9 11.5.1 Adjustments, settings and indicators On: PLL unlocked bias adjustment factory settings - do not change factory settings - do not change factory settings - do not change 11.6 Power Amplifier Two version of the RF power amplifier are available, 30 and 60/100W.

  • Page 57: Panel Board

    11.7 Panel Board 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 58: Cpu Card

    PTX-LCD 11.7.1 Adjustments, settings and indicators Position of panel card jumpers. The software denotes jumper positions as follows (1 signifies a closed jumper, 0 open jumper, X any position): ˆ€ƒÃ ˆ€ƒÃ ˆ€ƒÃ ˆ€ƒÃ ˆ€ƒÃ rhvtà #à $à %à &à 'Ã...

  • Page 59: Telemetry Board (Optional)

    PTX-LCD D1-D9 Figure 11-13 11.8.1 Adjustments, settings and indicators D1-D9 On: communication activity 1-2, 3-4 serial port set as DCE 5-6, 7-8 serial port set as DTE 7-8 closed, 17-18 open: no parameter of the exciter is locally controllable 7-8 open, 17-18 closed: only the default menu parameters are modifiable, the user can’t...

  • Page 60: Audinp-Dig Board (Option)

    This option supports S/PDIF, AES/EBU, IEC958 and EIAJ CP340/1201 data formats. 11.10.1 Functional description The option section is placed on the rear part of the PTX-LCD and is directly connected to the audio motherboard using a strip line connector. It is composed of three different boards.
  • Page 61 PTX-LCD Figure 11-15 After the necessary processing (filtering, level regulation, digital/analog conversion, selection), the audio input section passes the signal to the audio motherboard that routes them to the coder card. JP11 JP12 JP10 Figure 11-16 User Manual Rev. 2.3 - 18/07/07...
  • Page 62 PTX-LCD Figure 11-17 58 / 58 Rev. 2.3 - 18/07/07 User Manual...

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