POS-50N+ / POS-50ND+ User Manual
Contents
1. 6 ALARM Red LED light when the alarm function is operating high reflect power high SWR or high temperature 7 RF ON Green LED light when the exciter s power output is on 8 LEFT Push button to decrease value 9 UP Push button to change parameter display 10 RIGHT Push button to increase value 11 DISPLAY Liquid crystals display 12 DOWN Push button to change parameter display 13 ENTER Push button to confirm a parameter User manual V1 0 www posbroadcast com 10 of 17 1 LEFT 2 RIGHT MONO 3 AES EBU 4 RS232 5 AIR FLOW 6 FUSE 7 PLUG 8 RF TEST 9 RE OUTPUT 10 MPX 11 SCA1 RDS 12 SCA2 13 19 KHZ OUT 14 INTERLOCK IN 15 INTERLOCK OUT 16 GND User manual V1 0 POS 50N POS SO0ND es jt bs lllllo Ilis S A Ss A A A ARAA A XLR connector balanced Left channel input And adjustment trimmer for Left channel input level on bottom connector XLR connector balanced Right channel input And adjustment trimmer for Right channel input level on bottom connector XLR connector Digital audio input optional DB9 connector for interconnection with other devices and for parameters programming Grid for the intake of the air flow of the forced ventilation Fuse holder Use a screwdriver to access the fuse Contains the general protection fuse rated 5 A Mains supply plug 200 260V 50 60 Hz RF test output RF output connector N type 500 BNC2. POS 50N POS 50ND POS 50N POS 50ND User Manual User manual V1 0 www posbroadcast com I of 17 POS 50N POS 50ND 1 General Description 2 Installation and use Description 2 1 Preparation 2 2 Use 2 3 Front panel control 3 External Description 3 1 Front Panel 3 2 Rear Panel 3 3 Connector Description 4 Technical Specifications 4 1 Physical specifications 4 2 Electrical specifications 5 Working Principles 5 1 Power Supply 5 2 Main Board 5 3 Control Board 5 4 Audio amp VCO Board 5 5 Audio Connector 5 6 Interface Connector 5 7 Power Amplifier Board Contents User manual V1 0 www posbroadcast com 2 of 17 POS 50N POS 50ND 1 General Description The POS 50N series is transmitter for Frequency Modulated audio broadcasting in a frequency modulation able to transmit in the band between 87 5 and 108 MHz with an output RF power adjustable up to a maximum of 50 W Outstanding audio features this device has are low distortion and inter modulation values and the high signal to noise ratio Another important feature the POS 5ON series has is its great simplicity of construction and use The POS 50N series was designed to be modular Its various functions are run from modules directly connected to each other with male and female connectors or with flat cables ending in connectors This type of design makes maintenance operations and any required module replacement easier All models are made wi
3. lt 0 3 gt 50 dB 2 BNC DB9 female RS232 User manual V1 0 www posbroadcast com 14 of 17 POS POS 50N POS SOND 5 Working Principles A diagram view of the modules and connections making up the POS 5ON series is shown as below Interlock Gut 4 Interlock R5232 Era Power Supply mar mm Transformer 18 0 18 RF Output Block Diagram for FM Transmitter Model POS 50N POS 50ND Pre emphasis CPU amp LCD Panel FM Amplifier SOW Limiter VCO 87 5 108 MHz TE User manual V1 0 www posbroadcast com 15 of 17 POS 50N POS 50ND 5 1 Power Supply POS 5ON series power supply is a switching type of unit and its main 18V 18V 12V and 28 V output feeds the RF amplifier and regulate broad of the machine The power supply is connected to voltage between 200 and 260 V without having to make adjustments or manual settings 5 2 Main Board The Main board contains the microcontroller PIC18F6621 that implements the machine s control software the display and the other components needed to interface the user The board interfaces with the other machine modules both for power supply distribution and for the control and measures 5 3 Control Board The control board contains the measure and control parameter forward reflect voltage current temperature bias etc The board interfaces with the other machine modules both for LCD and
4. and LEFT push buttons After having set a new audio input impedance value press the ENTER push button to confirm the choice User manual V1 0 www posbroadcast com S of 17 POS 50N POS 50ND 2 3 7 Audio Input type setting This menu lets you read and set the audio input type A Audio Input dl y PANG DIG Keep the ENTER push button The screen that is show in the modification mode is similar to the following A Audio Input gt ANG DIG l A gt Press LEFT or RIGHT y PANG DIG By pressing the ENTER push button you can modify the audio input type using the RIGHT and LEFT push buttons After having set a new audio input type value press the ENTER push button to confirm the choice Note for mode DIG this reserve for digital audio input AES EBU option on request User manual V1 0 www posbroadcast com 9 of 17 POS POS 50N POS 50ND 3 External Description This chapter reports the elements of the front and rear panels of the POS 5ON series with a brief description of each of them 3 1 Front Panel 1 AIR FLOW Grid for the intake of the air flow of the forced ventilation 2 POWER ON OFF switch This switch disables the exciter without disconnecting the mains supply 3 ON Green LED light when the exciter is working 4 LOCK Green LED light when the PLL is locked on the working 5 OVER MOD frequency Yellow LED light when the modulate audio signal more than 75 KHz
5. its final amplifications up to 50OW The amplifier is made in three stages The first is made with BGF35 and with one BLF244 and the last with one MRF173 In addition to the actual RF amplifier this circuit carries out the following functions e Control of the power level in output depending on the setting e Measures direct and reflected power through directional couplers e Low pass filtering of the RF signal in output e RF sample User manual V1 0 www posbroadcast com 17 of 17
6. RIGHT and ENTER User manual V1 0 www posbroadcast com 3 of 17 POS 50N POS 50ND 2 Installation and use Description This chapter contains the necessary information for installing and using the machine In the event any aspects are not completely clear for example when using the machine for the first time we recommend you carefully read the entire description contained in this manual 2 1 Preparation Unpack the exciter and before doing any other operation be sure it has not been damaged during transport In particular check that all the connectors are in perfect condition The main fuse can be accessed from the outside on the rear panel Extract the fuse carrier with a screwdriver to check its integrity or for replacement if necessary The fuse to be used is this type 5A 220VAC Check that the POS 50N switches are in the OFF position The exciter has one switch for the mains power supply cable and completely interrupts the machine s mains power supply Connect the RF output of the exciter to the antenna cable or to a fictitious load 50 ohm Connect the mains cable Connect the earth cable Connect the audio cables of the signal source to the proper connectors on the back of the exciter 2 2 Use Check that the POS 50N switches are in the ON position Enter the ESC menu and ENTER to set the desired operating frequency By using the switches and trimmer found on the rear panel set the characteristics i
7. at is show in the modification mode is similar to the following ENTER Fwd 51 0 W dd q gt gt gt gt gt gt gt gt gt gt gt j FeseLEFTorRIGHT 4 ENTER Delay 3 second To increase the level press the RIGHT push button and to reduce it press LEFT As the set level increases or decreases the bar becomes longer or shorter to display the current setting When the designed level is reached press ENTER to confirm and exit the predefined menu 2 3 2 RF Power ON OFF To change the RF power ON or OFF select the menu power as below ENTER A SWR 1 0 JA SWR 1 0 ENTER fw Power OFF _ w Power ON lt i User manual V1 0 www posbroadcast com 6 of 17 POS 50N POS 50ND 2 3 3 Frequency setting This menu lets you read and set the operating frequency AFrea 100 00 MHz el v Lock Keep the ENTER push button The screen that is show in the modification mode is similar to the following AFreq 100 00 MHz ll enter Freq 100 00 MHz el i sl tune gt Press LEFT or RIGHT Delay 3 second Savi ng By pressing the ENTER push button you can modify the set frequency using the RIGHT the frequency increases and LEFT push buttons After having set a new frequency value press the ENTER push button to confirm the choice The exciter will release from the current frequency and it will latch onto the new operating frequency 2 3 4 Pre Emphasis setting This menu lets you read a
8. connector MPX unbalanced input And adjustment trimmer for MPX input level on top connector BNC connector SCA1 RDS unbalanced input And adjustment trimmer for SCA input level on top connector BNC connector SCA2 unbalanced input And adjustment trimmer for SCA input level on top connector BNC output for the 19 kHz pilot tone This can be used for external devices e g RDS coders synchronization BNC interlock in connector the exciter is forced in stand by mode when the inner conductor is grounded BNC interlock out connector the inner short to ground when alarm is on Ground of equipment connect to earth www posbroadcast com II of 17 POS 50N POS 50ND 3 3 Connector Description 3 3 1 RS 232 Type DB9 female 1 GND j 2 TX 3 RX 4 NC 00000 6 NC 6 7 NC 8 NC 9 NC 3 3 2 Audio input LEFT RIGHT Type XLR female 1 GND 2 Positive l 3 Negative User manual V1 0 www posbroadcast com 12 of 17 POS 50N POS 50ND 4 Technical Specifications 4 1 Physical specifications Panel size Depth Weight Working Temperature 4 2 Electrical specifications General RF output power RF output connector RF output impedance Frequency range Frequency setting Frequency step Frequency stability Modulation type Harmonics Out of Band Emission Spurious Modulation capability A C power supply Power consumption Input Left Right and Mono Input MPX input Input impedance MPX
9. input impedance Input level Pre emphasis SCA RDS input SCA RDS input impedance SCA RDS input level SCA RDS amplitude frequency response Output RF Out RF test 19 kHz pilot tone output 485 mm 19 x 88 mm 2U 440 mm 10 Kg 0 C 50 C 0 to 50 W adjustable N type female 50 Ohm 87 5 MHz 108 MHz software programming 10 KHz lt 300HZz from 10 C to 50 C direct carrier modulation lt 65 dBc lt 85 dBc lt 5KHz 200 V 260 V 300 VA Type XLR female balanced Type BNC unbalanced balanced input 600 or 10 k Ohm selectable unbalanced input 10 k Ohm 6 dBm 12 dBm adjustable Selectable 0 50 us CCIR 75 us FCC 2 BNC unbalance 10 kOhm 6 dBm 12 dBm adjustable 0 2 dB 40 kHz to 100 kHz N type female 50 Ohm BNC connector BNC connector 1 3 Vp p User manual V1 0 www posbroadcast com 13 of 17 POS 50N POS 50ND MONO operation SIN Amplitude frequency response Total harmonic distortion THD MPX operation Composite S N MPX amplitude frequency response MPX Total harmonic distortion THD Stereo separation Stereo operation S N FM Stereo Audio frequency response Total harmonic distortion THD Stereo separation Connections Interlock connector Serial interface gt 70dB 0 5 dB 20Hz 15 KHz lt 0 3 gt 70dB 0 1 dB 20 Hz 53 KHz 0 2 dB 53 KHz 100 KHz lt 0 3 gt 50 dB gt 70 dB 20 Hz 15 KHz
10. mpedance pre emphasis and if its necessary stereo mono and the levels of the audio and RDS input Set the desired power level from the LCD menu User manual V1 0 www posbroadcast com 4 of 17 POS 50N POS 50ND 2 3 Front panel control The machine is provided with a two line LCD display where a set of menus is shown When turned on the LCD display shows the predefined screen with the graphic representation of the instantaneous modulation level and indication of the direct power supplied The vertical bars under MOD indicate the progress of the modulation in real time the hatched bar signals the maximum nominal modulation level of 75 kHz 100 To change the menu select the UP or DOWN push button the screen that is shown in following AEmphasis el 50u P 75u Almp Audio In 4l J yv 600 10K J A Audio Input lt i Y PANG DIG J A Over MOD y A ID N130008 wv VS 50N V2 A TPA 39C v TGTPA 50C em tit it it it it It User manual V1 0 www posbroadcast com 5 of 17 POS 50N POS 50ND Symbol UP change parameter display on LCD DOWN change parameter display on LCD LEFT decrease value as setting RIGHT increase value as setting ENTER select to value change value SET value set by software tr VA ar 2 3 1 Power setting To change the set power level select the menu power as below A Fwd 51 0 Wl WV Rfl 0 9 W Keep the ENTER push button The screen th
11. nd set the pre emphasis A Emphasis YV Ou 50u PF 75u Keep the ENTER push button The screen that is show in the modification mode is similar to the following A Emphasis JE Ou 50u 75u Al Y Ou 50u P75u enter A ppl Press LEFT or RIGHT By pressing the ENTER push button you can modify the pre emphasis using the RIGHT and LEFT push buttons After having set a new pre emphasis value press the ENTER push button to confirm the choice User manual V1 0 www posbroadcast com 7 of 17 POS 50N POS 50ND 2 3 5 Audio Mode setting This menu lets you read and set the audio mode A Audio Mode l Y MPX MON PST Keep the ENTER push button The screen that is show in the modification mode is similar to the following A Audio Mode dl MPX MON ST dl i ER A Y MPX MON PST ener i gt Press LEFT or RIGHT By pressing the ENTER push button you can modify the audio mode using the RIGHT and LEFT push buttons After having set a new audio mode value press the ENTER push button to confirm the choice 2 3 6 Audio Input Impedance setting This menu lets you read and set the audio input impedance A ImpAudioln ed vY 600 10K Keep the ENTER push button The screen that is show in the modification mode is similar to the following vg i x pera men mE e P LEFT or RIGHT Vv 600 1 OK A ie Fress Leri or KIG By pressing the ENTER push button you can modify the audio input impedance using the RIGHT
12. power amplifier board 5 4 Audio amp VCO Board The Audio amp VCO board card carries out the following functions 5 4 1 Encoder section The encoder audio input section contains the circuits that perform the following functions e Input impedance selection e 15 KHz filtering e Pre emphasis selection e Mixing of the signal MPX and SCA channels e Stereo multiplexing e 19 KHz generate e Measurement of the modulating signal e Measurement of the left and right signal 5 4 2 PLL section The PLL section of the card generates the signal in modulated radio frequency It is based on a PLL diagram that uses an MC145170 type of integrated PLL For frequency reference use to 10 000 MHz 5 4 3 VCO section The VCO section of the card generates the signal in fm band 87 50 108 MHZ It is based on a VCO diagram that uses to varicap tuning diode and PHA 1 low noise amplifier User manual V1 0 www posbroadcast com 16 of 17 POS 50N POS 50ND 5 5 Audio Con The connector needed to interface from audio signal and composite signal to audio amp VCO board for transmitter 5 6 Interface Con The interface connector needed to interface from machine and external machine for setup or monitoring 5 7 Power Amplifier Board The final power stage is enclosed in a totally shielded metal container fastened in the centre of the device The RF signal coming from the VCO is amplified and is then sent to the final stage that sees to
13. th SMD technology This exciter contains a low pass filter that reduces the harmonic emissions to below the limits allowed by international regulations and can therefore be used as a transmitter connected directly to the antenna The machine is offered in two versions one for Mono or MPX input wideband input that is useful when you want to transmit in stereo using an external stereo encoder and the other with an integrated stereo encoder The POS 50N stereo encoder guarantees excellent stereo separation together with a low harmonic distortion level Also the stereo version of the exciter can be configured for operating in Mono MPX mode meaning excluding the stereophonic coder and using the left input as the mono input and the BNC as the MPX The user can do the configuration through micros witches that are accessible from the outside Both versions have two inputs SCA1 and SCA2 for modulated signals on sub carriers from special external encoders normally used in Europe for RDS Radio Data System transmission The microprocessor system includes an LCD display and push button panel for inter action with the user and implements the following functions e Setting the output power e Setting the operating frequency e Measurement and display of the working parameters of the exciter The exciter s management software is based on a menu system The user can navigate between the various submenus by using four push buttons UP DOWN LEFT
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