Spectronic Denmark A S INCA Wireless Audio and PSTN Monitoring System User Manual Manual

Spectronic Denmark A/S Wireless Audio and PSTN Monitoring System Manual

Manual

COMPANY CONFIDENTIALSpectronic Denmark A/SSkindbjergvej 44DK-8500 Grenaa, DenmarkTelephone +45 86 38 72 22Fax + 45 86 38 77 04sales@spectronic-denmark.comwww.spectronic-denmark.comWireless Audio and PSTNMonitoring SystemINCA
Page 2 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCATable of Contents1 Introduction to Wireless Audio Monitoring......................................42 INCA System Introduction .................................................................72.1 General..........................................................................................92.2 The System ...................................................................................92.3 The Transmitter System ..............................................................102.4 Transmitter ..................................................................................102.5 Remote Receiver / Transmitter ...................................................112.6 Power Supply ..............................................................................112.7 Receiver ......................................................................................123 Technical Specifications INCA ........................................................173.1 Test Results – Duracell Alkaline 9V MN1604-6LR61 .................204 Parts List – INCA Basic Configuration 1 ........................................225 Parts List – INCA Basic Configuration 2 ........................................236 Parts List – INCA Basic Configuration 3 ........................................247 Parts List – INCA Options ................................................................258 INCA TX/RC PSTN Wireless Telephone Line Transmitter ............268.1 Introduction..................................................................................268.2 System Concept ..........................................................................268.2.1 General .............................................................................268.2.2 Application Note ................................................................278.2.3 Block Schematic................................................................288.2.4 Transmitter ........................................................................288.2.5 Remote Control Receiver..................................................298.2.6 Remote Control Upcodes..................................................308.3 Technical Specifications..............................................................31
Page 3 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCA9 INCA TX/RC VOX Wireless Transmitter ..........................................329.1 Introduction..................................................................................329.2 System Concept ..........................................................................329.2.1 General .............................................................................329.2.2 Application Note ................................................................339.2.3 Block Schematic................................................................349.2.4 Transmitter ........................................................................349.2.5 Remote Control Receiver..................................................359.2.6 Remote Control Upcodes..................................................369.3 Technical Specifications..............................................................37Wire Connections for MMM......................................................................38Wire Connections for RCM and Battery...................................................39Wire Connections for MMM and RCM .....................................................40Wire Connections for TXH with Battery ...................................................41Wire Connections for MMM and TXH ......................................................42Wire Connections for RCM and TXH with Battery ...................................43Wire Connections for MMM plus TXH and RCM .....................................44Wire Connections for TXM with Battery ...................................................45Wire Connections for MMM and TXM......................................................46Wire Connections for RCM and TXM with Battery...................................47Wire Connections for MMM plus TXM and RCM .....................................48Spectronic Denmarkreserve the right to alter all specifications without prior notice
Page 4 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCA1 Introduction to Wireless Audio MonitoringIn today’s increasingly complex environment of electromagneticsignals in the radio frequency spectrum, wireless audio surveillanceoperations are subject to several hostile parameters, which are criticalfor operation success and ultimately monitored high-quality audiosignal retrieval. Wireless operations are also subject to manymysterious theories, but are fairly handable if the right natural laws areimplemented.Several parameters has to be taken into consideration while usingwireless audio surveillance systems versus wired systems.Convolutional and additive noise sources are the same, but other veryimportant matters such as; frequency area, electronic interference,battery lifetime, operative range, receiving antenna, radio signalreflections, building layouts and construction techniques, are oftenmaking such operations fairly complex and require good planningalong with the use of professional audio monitoring equipmentdesigned for the task.Convolutional Noises are normally related with room resonancesand reverberations as major sources of this type of noise. Large roomsand lack of sound absorbing material contribute to undesiredconvolutional effects.Additive Noise sources erupt from e.g. radio and TV audio along witha variety of noises entering from outside like mechanical movementsof the microphone element, air conditioners, motors, street noise orother machinery.Frequency Area is important for the operation, as concealment of thesurveillance carrier in the frequency spectrum is of importance ifpossible, in order to avoid countermeasures or occasional interceptionby third party. The frequency also has to be chosen in connection withsignal path loss i.e. operative distance, as to say the higher frequencythe shorter operative distance and signal penetration of buildings.Electronic Interference can be avoided to a certain extent butrequires a selective receiver with very good input filtering, whichminimizes interference from other transmitting sources. Only receivers
Page 5 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCAdesigned specially for the surveillance task, will assure the immunityand dynamic range required for optimized audio signal retrieval,easing the work for the transcriptor.Battery lifetime/-type is another high priority factor, often surroundedby lots of mystique but it is straight forward and can be calculated bysimply dividing thetransmitter current consumption (measured in mA) into the datas fromthe battery specifications (specified in mA/hour).Operative range is an unpredictable matter mainly linked up withthree major parameters; transmitting power (specified in mW),operative frequency (specified in MHz), i.e. the higher frequency thelower range due to signal attenuation in the radio frequency spectrumas well as the physical surroundings (e.g. buildings or vehicles) for theoperation to be carried out.Receiving antenna is as important as the radiated power from thetransmitter itself. Making use of the correct antenna on the receiverside, example a narrow band directional antenna will provide a noisefree amplification of several dB, extending the operative range of aconcealed transmitter considerably e.g. 50 - 100 meter.Radio Signal Reflection as a normal used antenna is providing athree-dimensional transmission path, another factor to be aware of isthat a radio signal which has penetrated a buildings internal clutter,may often be exceeded by a signal, which has taken a more in-directreflection route, perhaps by reflection from an adjacent building,proving a better reception at the receiver/listening post (specially in themicrowave bands i.e. high frequency area).Building layouts and construction techniques are other veryimportant factors to take into consideration, where a wireless operationis to be accomplished.The loss of the radiated signal will be high in a reinforced concretebuilding with internal metal partitions, that impede transmission, versusa hangar-like building which will act almost like a waveguide. Thevarious difficulties in such operations are of disadvantage to the audiosurveillance task-team. But if present handrules are taken into
Page 6 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCAconsideration, while planning and training for such operations and theuse of high-quality professional monitoring tools designed for the taskare deployed, then a maximum of parameters have been considered bythe surveillance team and a successful operation should be assured.
Page 7 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCA2 INCA System IntroductionSpectronic Denmark has developed a completely new generation ofprofessional, highly advanced, micro-size modular and remote-controlled, audio/signal transmitters, which satisfy the very stringentoperative requirements involved in wireless on-site target monitoringoperations.The INCA system is fully modular, assuring maximum flexibility/-expandability and is designed for applications, which range from singletarget operations to large scale multi target operations, incorporatingan adequate number of modular INCA receivers and transmitters inorder to fulfil the operative requirement.The INCA system forms the platform of the most flexible, expandableand advanced wireless audio monitoring system available on today’sworld market.With the extensive use of the absolute latest new micro computer andSMD technology, the INCA family provides monitoring capabilities farmore advanced than ever seen before, with respect to operativefacilities, size, current consumption, ease of operation and reliability.As well as having extremely advanced operating capabilities, the INCAsystem is designed to be both rugged and highly adaptable to thealways adverse conditions in surveillance operations.Along with highly advanced electronic performance each unit isdesigned to meet requirements for shock, vibration and humidityassuring perfect function after rapid deployment in contingencysituations at the surveillance scenario.
Page 8 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCAINCA SYSTEMTarget locationListening post Audio rec.OPERATIONAL SET-UPINCATXMPSTN0.40.81.21.62.0 2.42.83.23.64.0 0.10.20.51.02.04.08.010 1510740151074QFkHzdBPARAMETRICEQUALIZERAUDIO VOXPHONESGAIN SET DATA ENTRYLEVELREL AYSPEC TRONI C D ENM ARKINCARSSIPOWERPOWERTar g etsignalRemotecontrolMain115/230INCAPCIINCAMMM
Page 9 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCA2.1 GeneralThe INCA system is an advanced wireless remote controllabletransmitter/receiver set. The transmitter consists of a micro SMDpieced module together with a remote - control module.The receiver is a high sensitive PLL double conversion tuner andcontains a powerful remote - control transmitter.2.2 The systemRemote -transmitter6320 - 330 Mhz433.92 MhzTransmitter1Remote -receiver2115/230VPower supply33.3- 6.5VLithium7Receiver5FIGURE 1 Block diagram for the system
Page 10 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCA2.3 The transmitter systemThe transmitter system consists of 3 modules. A transmitter module(1) which can be used as a stand-alone transmitter, a remote - controlmodule (2). The system is powered either from a4 - 6V battery (7) or from the mains via a small switch - mode powersupply (3). The modules (1) and (2) measure approx. 8.5 x 13 x 38 mm and module (3) 12 x 18 x 35 mm. The modules areequipped with small connectors and are connected to each other bymeans of flexible wires. That means that you can choose to install thewhole unit as a long “train” or folded together as a compact block.2.4 TransmitterThe transmitter is very small that makes it is easy to conceal and isbuilt of high quality miniature SMD components to obtain a highdegree of reliability. It consists of a high sensitivity microphone withlow vibration sensitivity succeeded by an AGC-amplifier that is feedingthe FM modulation and output circuits. The AGC action of the amplifierprevents over modulation at high sound levels and in the same timemakes it possible to listen to very weak conversation.The transmitter is based on a crystal controlled PLL oscillator.The output power is in the range from (5-30) mW depending on thechosen power supply. With the 30 mW output power the cover rangewill be app. 1000 meters at free sight and down to 50 - 100 meters inconcrete buildings. For maximum battery lifetime and for minimisingthe risk to be found by “bug detectors” or “scanners” the transmittercan be switched off into “sleep - mode by means of the remotecontrol. During the off state the transmitter is totally switched off, andas the remote receiver does not contain a local oscillator as wouldnormally be the case, when using a heterodyne receiver, everything istotally quiet.Also for minimum current consumption, analogue frequencymodulation with an audio bandwidth of (300 - 5000) Hz has beenchosen.The scrambler, which has been added for greater security and to avoidlistening in by unauthorised persons, can be switched on and off bymeans of a jumper. It is based on simple frequency - inversiontechnique due to the very low power needed for that sort of circuitry.
Page 11 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCAIn the scramble mode the audio frequency response as well as thesignal to noise ratio are somewhat degraded compared to theunscrambled mode.2.5 Remote receiver / transmitterThe remote - receiver module RCM is designed with a very small andsensitive hybrid IC for unlicensed low-power remote control.The system uses on-off keyed (OOK) modulation from amicrocontroller IC. Thus the The X-IDER remote control system canbe programmed with 4096 codes and with 8 factory pre-set into theINCA receiver.Normally such a system has a very limited coverage range due to thelimited output power dictated from regulations. Therefore the outputpower from the remote transmitter, which is build in the main receiver,has been “boosted” up to approx. 3 W., which will give a cover rangefarbeyondthatofthemainsystem.Infreeairtheremotecontrolwillreach up to 1 km. But inside buildings the range will be much shorterdepending on the local conditions. The remote receiver modulemeasures approx. 8.5 x 13 x 38 mm.2.6 Power supplyThe transmitter is powered by a 3.6 – 6.5V battery depending on therequired output power, alternatively from a small 115/230V AC mainspower supply which measures approx. 12 x 18 x 35 mm. The outputvoltage is 5.75 V DC, 0.4 W max. and the mains voltage can be either115 or 230 V AC 50/60 Hz (must be specified!). This power supply is aunique switch-mode construction with sinusoidal voltages andcurrents. This will greatly reduce the radiation of unwanted harmonicsand spurious frequencies and omit the need for bulky EMC filters andmetal screening.Although the power supply is mains isolated to withstand avoltage of 500 VAC it is not able to fulfil international safetyregulations. Therefore the power supply should only be used inprofessional applications and is not intended for commercial use.2.7 ReceiverThe receiver consists of a double conversion PLL tuner with very highsensitivity. The tuner functions are controlled by means of amicrocontroller via a LCD - display and 4 push buttons on the front.
Page 12 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCAUnderneath the display is placed the 4 push buttons by means ofwhich the different functions and set-ups of the receiver can becontrolled. The display will show the chosen channel number, one ofeight possible channels. Besides you will se the status of the fourchannels, whenever they are active or not, which also can bemonitored on a RSSI bar - graph display.On the back of the receiver there are two antenna BNC - connectors;one for RF input and one for remote power output, since the remotetransmitter is within the same cabinet as the receiver. You also have aswitch to bypass the build in de-scrambler, in case you have chosenan unscrambled transmitter.You will also find a relay output to switch a tape or a DAT recorder.The relay is controlled either by a VOX (voice operated switch) circuitor the RSSI level. This VOX is an advanced type of circuit that has theability to distinguish a voice from the background noise and trigger theswitch output circuit only by the voice signal. Therefore, the switchingoperation is highly reliable in noisy environments. The sensitivity of theswitch as well as the switch-off delay of the VOX relay can also beprogrammed from the front by means of the pushbuttons. The activityof the VOX circuit as well as the function of the relay can be seen onLED's on the front panel. The VOX relay has an adjustable switch-offdelay to avoid to many stops in the recordings during pauses in theconversation.There are 2 audio outputs; one line output with phono socket and atelephone output with both 4-mm panel sockets and a standardtelephone connector. The telephone has a standard 600 ohm outputimpedance and is equipped with an isolation transformer.The audio signal is passed through a parametric equalizer that has avariable 12dB boost or cut in the frequency range from 100 Hz to 10kHz as well as a variable Q (the reverse of the relative bandwidth ofthe boost or cut). By means of this equalizer it is possible to obtainmuch better audio quality in noisy environments. The receiver has abuilt-in loudspeaker that is automatically switched off when theheadphone jack is connected to the socket.The receiver is powered from main 115/230 V AC, alternatively from12 -15 V DC.
Page 13 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCA
Page 14 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCA220110OUTPUTLINETA P ELINE OUT ANTENNA 1ANTENNA 2RELAY OUT DC INFUSEM AX. 48V /1A 12 VDC2A115/230VAC IN PUTVOLTAGESELECTORFUSE250mAINCA OPERATIONAL INSTRUCTIONRear sideAntenna 2:Signal to remote control (Thin antenna)Antenna 1:Signal from TX (Thick antenna)600 Ohm output forphone linephono connectorOutput for audiotape recorderMains connectorInput ext. DC600 Ohm output for phoneline, screw terminalsRelay output forcontrol of tape recorderInput ext. DC115/230 Volt selector250 mA system fuse
INCA OPERATIONALINSTRUCTION
Page 16 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCA3 Technical SpecificationsReceiverTunerFrequency range 1 (standard) (320 - 330) MHzFrequency range 2 (160 - 170) MHzSensitivity (fmod. = 1kHz, deviation ±3kHz,20 dB SINAD) -113 dBm (0.5 uV)Channel raster 12.5 kHzMinimum channel spacing 25 kHzAudio modulation FMFrequency response (input to line out) 220 Hz - 6 kHz - 3dBAM rejection (Vin=- 50 dBm, AMmod=30 %) 45 dBDistortion(Vin = - 50 dBm, deviation = ±3 kHz) < 2 %, 1kHzInput impedance 50 ohmAudio frequency response - 3dB (line out) 220 Hz to 6 kHzOutput voltage line out (deviation= ±3 kHz) 700 mV (no load)Output voltage tlf. out (deviation= ±3kHz) 230 mV (600 ohm load)Output impedance tlf. Out 600 ohmOutput impedance line out 1 kohmOutput impedance headphones out 47 ohmParametric equalizer frequencyadjustment range 100 Hz to 10 kHzParametric equalizer gain adjustment range ±12 dBParametric equalizer Q adjustment range 0.4 to 4RF level meter range (-120 to -60) dBmRemote transmitterRemote control frequency1 (standard) 433.92 MHzOutput power into 50 ohm > 2.5 WModulation OOKCoding addresses 4096General
Page 17 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCAPower supply mains feed 115/230V AC (50/60 Hz)Power supply external DC input 12 - 15 V DCCurrent consumption external DC input < 200 mA 12 V DCDimensions 265 x 260 x 82 mm10.4 x 10.2 x 3.2 inchesWeight 2.8 kg / 6.17 lbs.Transmitter moduleOutput frequency range 1 (standard) (320 - 330) MHzOutput frequency range 2 (160 - 170) MHzNumber of channels in the frequency range max. 8Minimum channel spacing 25 kHzChannel raster 12.5 kHzOutput impedance 50 ohmOutput power into 50 ohm (Vbatt. = 6V) 30 mW min.Max. Modulation (FM) ±3kHzFrequency response unscrambled 100 Hz to 10 kHz - 3 dBFrequency response scrambled 280 Hz to 4 kHz - 3 dBAudio amplifier AGC range 50 dBMicrophone vibration sensitivity: < 66 dBCurrent consumption, active (Vbatt. = 6V) 300 mA DC typ.Current consump., sleep mode (Vbatt. = 6V) <2 uA DCSupply voltage (3.3 – 6.5) V DCDimensions 38 x 13.5 x 8.5 mm1.5 x 0.5 x 0.3 inchesRemote control moduleRemote control frequency1 433.92 MHzSensitivity - 100 dBm typ.Modulation OOKCoding addresses 4096Power supply (3.3 – 6.5) V DCCurrent consumption < 20 uA DCDimensions 38 x 13.5 x 8.5 mm1.5 x 0.5 x 0.3 inchesPower supply 6 VDC / 0.4 WMains voltage 115/230 V ACPrimary current at max. load 6 mA AC
Page 18 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCAOutput voltage 5.75 V DCOutput current 75 mA max.Dimensions 38 x 18 x 12 mm1.5 x 0.7 x 0.5 inchesTransmitter systemTotal current consumption, switched off <20 uA DCTotal current consumption, switched on 60 mA DC typ.Overall unscrambled frequency response(transmitter - receiver) 250 Hz - 6 kHzOverall scrambled frequency response(transmitter - receiver) 350 Hz - 4 kHz
Page 19 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCA3.1 Test results for X-IDER 4096With new Duracell Alkaline 9V MN1604-6LR61Transmitting power (Watt) No. of transmissions Battery power bylast transmission (VDC)Over 2.00 45 7.81.75 – 2.00 25 7.51.50 – 1.75 25 7.31.25 – 1.50 42 7.01.00 – 1.25 57 6.850.9 – 1.00 140 6.70.8 – 0.9 137 6.6 Battery LOWstarts and stops.0.7 – 0.8 93 6.50.6 – 0.7 85 6.4 Battery LOWon every time.0.5 – 0.6 110 6.30.4 – 0.5 90 6.2It is to be expected that the XIDER 4096 TX unit should be able to perform about 100transmissions with a good distance by using a new good quality battery.
Page 21 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCAINCA SYSTEMListening postMulti target/large scale configuration0.40.81.21.62.0 2. 42.83.23.64.0 0.10.20.51.0 2.04.08.010 1510740151074QFkHz dBPA RAM ETR IC EQ U A LIZE RAUDIO VOXPHONESGAIN SET DATAENTRYLEVELRELAYSPECTRONIC DENMARKINC ARSSIPOWERPOWERHOTELINCATXMINCA transmitmodule TXMINCA remotemodule RCMPSTNMain110/240
Page 22 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCA4 Parts List INCA Basic Configuration 1Pcs Description1 INCA RX1 INCA TXM Opt. 003 channel 1 + INCA RCM Opt 0041 Antenna 1, telescope1 Antenna 2, 70 cm band1 Headphone1 Elbow BNC connector1 Extra fuse 250 mA1 Extra fuse 2 A1Powercord1 Cable for relay (Lemo to open end)1 INCA User Guide1 Suitcase2Keys
Page 23 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCA5 Parts List INCA Basic Configuration 2Pcs Description1 INCA RX1 INCA TXM Opt. 003 channel 1 + INCA RCM Opt 0041 INCA TXM Opt. 003 channel 2 + INCA RCM Opt 0041 INCA TXM Opt. 003 channel 3 + INCA RCM Opt. 0041 INCA TXM Opt. 003 channel 4 + INCA RCM Opt. 0041 Antenna 1, telescope1 Antenna 2, 70 cm band1 Headphone1 Elbow BNC connector1 Extra fuse 250 mA1 Extra fuse 2 A1Powercord1 Cable for relay (Lemo to open end)1 INCA User Guide1 Suitcase2Keys
Page 24 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCA6 Parts List INCA Basic Configuration 3Pcs Description1 INCA RX1 INCA TXM Opt. 003 channel 1 + INCA RCM Opt 0041 INCA TXM Opt. 003 channel 2 + INCA RCM Opt 0041 INCA TXM Opt. 003 channel 3 + INCA RCM Opt. 0041 INCA TXM Opt. 003 channel 4 + INCA RCM Opt. 0041 INCA TXM Opt. 003 channel 5 + INCA RCM Opt 0041 INCA TXM Opt. 003 channel 6 + INCA RCM Opt 0041 INCA TXM Opt. 003 channel 7 + INCA RCM Opt. 0041 INCA TXM Opt. 003 channel 8 + INCA RCM Opt 0041 Antenna 1, telescope1 Antenna 2, 70 cm band1 Headphone1 Elbow BNC connector1 Extra fuse 250 mA1 Extra fuse 2 A1Powercord1 Cable for relay (Lemo to open end)1 LEMO plug 2-pol for DC IN1 INCA User Guide1 Suitcase2Keys
Page 25 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCA7 Parts List INCA OptionsPcs DescriptionINCA TXM Opt. 003 channel 1INCA TXM Opt. 003 channel 2INCA TXM Opt. 003 channel 3INCA TXM Opt. 003 channel 4INCA TXH Opt. 008 channel 1INCA TXH Opt. 008 channel 2INCA TXH Opt. 008 channel 3INCA TXH Opt. 008 channel 4INCA RCM Opt. 004INCA SXM Opt. 005INCAPCIOpt.006INCA MMM Opt. 0078 INCA TX/RC PSTN Wireless Telephone LineTransmitter
Page 26 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCA8.1 IntroductionThis document describes the general functions and performance of theSpectronic INCA TX/RC PSTN wireless telephone line transmitter.Information on the items of a specific delivery is to be found in aseparate document, stating TX frequency and remote control addresscodes of the individual units.Note: The special functions/upcodes will only be available, if using anX-IDER TX. Please refer to “Remote Control Upcodes 8.2.6” page 30.8.2 System Concept8.2.1 GeneralThe INCA TX/RC PSTN is a series of wireless, remote controllable,minimum size VHF or UHF transmitters intended for concealed roommonitoring connected in parallel to a PSTN telephone line. The inputimpedance is very high, so the loading of the telephone line will benegligible. The transmitters can be switched into a “sleep-mode” bymeans of the wireless remote control X-IDER transmitter. In this“sleep-mode” the current consumption is only app. 35 uA, which willmaximize the lifetime of the battery. Alternatively, at the expense of alittle higher current consumption (approx. 90 uA), the transmitter canbe switched into an OFF-HOOK mode. In this state the transmitter isonly running when the DC off-hook level of the telephone line isbelow a predetermined value. This OFF-HOOK circuit has threedifferent selectable remote control turn-on levels, which arerespectively 10V, 20V and 40V DC line voltage.The transmitter also includes audio scrambler-circuit, which can beswitched on and off by the remote control, just like the OFF-HOOKcircuit and the sleep-mode state. The TX unit comes with flying leadsfor battery connection, telephone line connection and for remote RXantenna, whereas the TX antenna terminal has a female MMCX-connector. The TX unit is deliverable with either internal or externalmicrophone.8.2.2 Application NoteWhen an antenna is in close proximity to metal surfaces, concretewalls or the human body, the efficiency of the transmitter will be
Page 27 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCAminimized due to power absorption and disturbance of the antennaradiation pattern. To achievemaximum RF range, it is therefore advisable to keep the antenna sofar away from the surroundings as possible. If you let the TX runcontinuously, your operational time will be degraded seriously. Whenno monitoring is wanted or you know for sure that the target personwill not be present for a certain period, it is therefore advisable toswitch off the transmitter via the X-IDER remote-control transmitter topreserve the battery. Alternatively, you simply choose OFF-HOOKmode, in which case the TX only will “go in the air” every time thephone is going off-hook.Although the transmitter will work excellently with most standardreceivers or scanners, provided they have the right audio de-emphasis, you will get the best results by using the Spectronic INCAreceiver. Most standard receivers and scanners have an audiobandwidth of 300-3000 Hz, whereas the INCA receiver has abandwidth from 300-4000 Hz, even in scramble mode. Investigationsat Spectronic have shown that the audio intelligibility is improvedsubstantially by increasing the upper audio band limit from 3000 Hzto 4000 Hz. The INCA receiver also has superior selectivity andsensitivity, which will give the best possible RF range.8.2.3 Block SchematicRC-receiverAudio-AGCTX-partTX antennaRC-antennaX-ider TXBattery ormainsmodule(MMM)TX-RC -PSTNScramblerPh o n ePh o n e l i n e8.2.4 TransmitterThe transmitter is made of high quality miniature SMD componentsto obtain a high degree of reliability. Since is very small, it is easy to
Page 28 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCAconceal. It consists of an AGC-amplifier that feeds both thescrambler, the FM modulation and the output circuits. The AGCaction of the amplifier prevents over-modulation at high sound levelsand makes it possible to listen to very weak conversation at thesame time.The transmitter is based on a crystal controlled PLL-synthesizedoscillator. The frequency can be chosen in the range (320-330) MHzor (155-173) MHz.For maximum battery lifetime and for minimizing the risk of beingfound by “bug detectors” or “scanners” the transmitter can beswitched off into “sleep-mode” by means of the remote control.Alternatively the transmitter can be switched off into a “OFF-HOOKmode” with the same advantages. In the “sleep-mode” the receiveronly goes in the air in approx. 30 msec. for every 2.5 seconds to lookfor a valid code transmissionDuring off state, the transmitter is completely switched off. Since theremote receiver does not contain a local oscillator as would normallybe the case when using a heterodyne receiver, everything is totallyquiet and nothing can be traced by e.g. spectrum analyzers orscanners.For minimum current consumption, analogue frequency modulationwith an audio bandwidth of (280 - 5000) Hz (unscrambled mode) hasbeen chosen.The scrambler, which can be switched on and off by means of theremote control, has been added for greater security and to avoidlistening-in by unauthorized persons. It is based on simplefrequency-inversion techniques due to the very low power needed forthat sort of circuit. In the scramble mode, the audio frequencyresponse, as well as the signal to noise ratio, are somewhatminimized compared to the unscrambled mode.8.2.5 Remote Control ReceiverThe remote-receiver is realized by a very small and sensitive hybridIC, intended for unlicensed low-power remote control. The carrierfrequency is OOK (on off keyed) modulated and the system providesup to 4096 different address codes. The Spectronic X-IDER remote-control transmitter is used to send different codes for setting up theTX. By reception of a new upcode, the TX will send an acknowledge
Page 29 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCAsignal by toggling the RF on and off in three cycles of 0.6 Sec.duration.The Address Code of the Remote Control will be Factory set,according to customer specifications or as specified for standardfrequencies by Spectronic.
Page 30 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCA8.2.6 Remote Control UpcodesX-IDER left-hand HEX switch0TXon1 TX off (factory default)4 TX audio scrambler on5 TX audio scrambler off (factory default)A TX OOF-HOOK defeated (factory default)B TX with OFF-HOOK control, line voltage = 10V DCC TX with OFF-HOOK control, line voltage = 20V DCD TX with OFF-HOOK control, line voltage = 40V DCE Start up state after DC removal: TXoffF Start up state after DC removal: Same as before DCremoval (factory default)
Page 31 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCA8.3 Technical SpecificationsTransmitterOutput frequency range UHF (standard) (320 - 330) MHzOutput frequency range VHF (155 - 173) MHzOperational temperature range 0°-+50°C / 32F – 122FFrequency stability (above temp. range) ±5 ppmMinimum channel spacing 25 kHzChannel raster 12.5 kHzOutput impedance 50 ΩMax. Modulation: (FM) ±4kHzAudio frequency response unscrambled 100 Hz to 5 kHz - 3 dBAudio frequency response scrambled 280 Hz to 4 kHz - 3 dBAudio pre-emphasis 6dB/OctaveAudio amplifier AGC range 50 dBCurrent consumption, active (Vbatt. = 6V) <70 mA DCCurrent consumption, sleep-mode < 40 uA DCCurrent consumption, OFF-HOOK(PhoneON-HOOK) <100uADCOutput power (Vbatt. = 6V) >50 mW @ 50 ΩDC line input impedance >10 Meg ΩAC line input impedance >100 k ΩReceiverRemote control frequency 433.92 MHzSensitivity < - 90 dBmModulation OOKCoding addresses 40969. INCA TX/RC VOX Wireless Transmitter
Page 32 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCA9.1 IntroductionThis document describes the general functions and performance of theSpectronic INCA TX/RC VOX transmitter.Information on items of a specific delivery is to be found in a separatedocument, stating TX frequencies and remote control address codes of theindividual units.Note: The special functions/upcodes will only be available, if using anX-IDER TX. Please refer to “Remote Control Upcodes 9.2.6” page 36.9.2 System Concept9.2.1 GeneralThe INCA TX/RC VOX is a series of wireless, remote controllable,minimum size VHF or UHF transmitters intended for concealed roommonitoring or as body transmitters. The transmitters can be switchedinto “sleep-mode” by means of the wireless remote control X-IDERtransmitter. In this “sleep-mode” the current consumption is only app.35 uA, which maximizes the lifetime of the battery. Alternatively, atthe expense of a little higher current consumption (app. 90 uA), thetransmitter can be switched into VOX-mode, meaning that thetransmitter will run only when the microphone hear acoustic signalslike talking or music.This VOX is an advanced type of circuit that has the ability todistinguish voice from background noise and the power circuit isonly switched on when a voice signal is present. Therefore, theswitching operation is highly reliable in noisy environments. TheVOX-circuit has three different, selectable remote control turn-onlevels, which are respectively 2, 5 and 10 dB above backgroundnoise level.The transmitter also includes audio scrambler-circuit, which can beswitched on and off by the remote control, just like the VOX-circuitand the sleep-mode state. The TX unit comes with flying leads forboth battery connection and remote RX antenna, whereas the TXantenna terminal has a female MMCX-connector. The TX unit isdeliverable with either internal or external microphone.
Page 33 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCA9.2.2 Application NoteWhen an antenna is in close proximity to metal surfaces, concretewalls or the human body, the efficiency of the transmitter will beminimized due to power absorption and disturbance of the antennaradiation pattern. To achievemaximum RF range it is therefore advisable to keep the antenna asfar away from the surroundings as possible. If you let the TX runcontinuously, your operational time will be minimized seriously.When no monitoring is wanted or you know for sure that no personswill be present in the room for a certain period, it is advisable toswitch off the transmitter via the X-IDER remote-control transmitter topreserve the battery. Alternatively, simply choose VOX mode, whenin doubt whether persons will be present in the room beingmonitored. The TX will then only go “on the air” every timeconversation is detected in the room. After app. 15 sec. withoutconversation, the TX will go to sleep again and thus sawing batterypower.Although the transmitter will work excellent with most standardreceivers or scanners, provided they have the right audio de-emphasis, you will get the best results by using the Spectronic INCAreceiver. Most standard receivers and scanners have an audiobandwidth of 300-3000 Hz, whereas the INCA receiver has abandwidth from 300-4000 Hz, even in scramble mode. Investigationsat Spectronic have shown that the audio intelligibility is improvedsubstantially by increasing the upper audio band limit from 3000 Hzto 4000 Hz. The INCA receiver also has a superior selectivity andsensitivity, which will give the best possible RF range.9.2.3 Block Schematic
Page 34 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCARC-receiverAudio-AGCTX-partTX antennaRC-antennaX-ider TXMic Battery ormainsmodule(MMM)TX-RC -VOXScrambler9.2.4 TransmitterThe transmitter is made of high quality miniature SMD componentsto obtain a high degree of reliability. Since it is very small, it is easyto conceal. It consists of a highly sensitive microphone with lowvibration sensitivity succeeded by an AGC-amplifier that feeds boththe scrambler, the FM modulation and the output circuits. The AGCaction of the amplifier prevents over-modulation at high sound levelsand makes it possible to listen to very weak conversation at thesame time.The transmitter is based on a crystal controlled PLL-synthesizedoscillator. The frequency can be chosen in the range (320-330) MHzor (155-173) MHz.For maximum battery lifetime and for minimizing the risk of beingfound by “bug detectors” or “scanners”, the transmitter can beswitched off into “sleep-mode” by means of the remote control.Alternatively the transmitter can be switched off into “VOX-mode”with the same advantages. In “sleep-mode” the receiver only goeson the air in app. 30 msec. for every 2.5 seconds to look for a validcode transmissionDuring off state, the transmitter is completely switched off, and as theremote receiver does not contain a local oscillator as would normallybe the case, when using a heterodyne receiver, everything is totallyquiet and nothing can be found by e.g. spectrum analyzers orscanners.
Page 35 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCAFor minimum current consumption, analogue frequency modulationwith an audio bandwidth of (280 - 5000) Hz (unscrambled mode) hasbeen chosen.The scrambler, which can be switched on and off by means of theremote control, has been added for greater security and to avoidlistening-in by unauthorised persons. It is based on simplefrequency-inversion techniques due to the very low power needed forthat sort of circuit. In the scramble mode, the audio frequencyresponse, as well as the signal to noise ratio, are somewhatminimized compared to the unscrambled mode.9.2.5 Remote Control ReceiverThe remote-receiver is realized by a very small and sensitive hybridIC, intended for unlicensed low-power remote control. The carrierfrequency is OOK (on off keyed) modulated and the system providesup to 4096 different address codes. The Spectronic X-IDER remote-control transmitter is used to send the different codes for setting upthe TX. By reception of a new upcode the TX will send anacknowledge signal by toggling the RF on and off in three cycles of0.6 Sec. duration.The Address Code of the Remote Control is Factory set, accordingto customer specifications, or as specified for standard frequenciesby Spectronic.9.2.6 Remote Control UpcodesX-IDER left-hand HEX switch0TXon1 TX off (factory default)4 TX audio scrambler on
Page 36 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCA5 TX audio scrambler off (factory default)A TX with VOX defeated (factory default)B TX with VOX, level 2 dB above noiseC TX with VOX, level 5 dB above noiseD TX with VOX, level 10 dB above noiseE Start up state after DC removal: TX offF Start up state after DC removal: Same as before DCremoval (factory default)9.3 Technical SpecificationsTransmitterOutput frequency range UHF (standard) (320 – 330) MHzOutput frequency range VHF (155 – 173) MHzOperational temperature range 0°-+50°C / 32F – 122FFrequency stability (above temp. range) ±5 ppmMinimum channel spacing 25 kHzChannel raster 12.5 kHz
Page 37 of 48COMPANY CONFIDENTIALWireless Audio and PSTN Monitoring System INCAOutput impedance 50 ΩMax. Modulation (FM) ±4kHzAudio frequency response unscrambled 100 Hz to 5 kHz – 3 dBAudio frequency response scrambled 280 Hz to 4 kHz – 3 dBAudio pre-emphasis 6dB/OctaveAudio amplifier AGC range 50 dBMicrophone vibration sensitivity < 66 dBCurrent consumption, active (Vbatt. = 6V) <70 mA DCCurrent consumption, sleep-mode < 40 uA DCCurrent consumption, VOX-mode (silent room) < 100 uA DCOutput power (Vbatt. = 6V) >50 mW @ 50 ΩSize 33 x 24 x 7 mm1.3 x 0.9 x 0.3 inchesReceiverRemote control frequency 433.92 MHzSensitivity < - 90 dBmModulation OOKCoding addresses 4096

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