Lectrosonics IFBT4 user manual February 2009
Contents
1. 2 Sound source off or malfunctioning 3 Input cable damaged or mis wired No Received Signal 1 Transmitter not turned on 2 Receiver antenna missing or improperly positioned The IFBR1 IFBR1a headset cable is the antenna 3 Transmitter and receiver not on same frequency Check on transmitter and receiver 4 Operating range is too great 5 Transmitter antenna not connected 6 Transmitter switch in the TUNE position Switch to XMIT mode No Sound or Low Sound Level and Receiver is 1 2 3 Distorted Sound 1 Hiss Noise or Audible Dropouts 1 powered on Receiver output level set too low Receiver earphone cable is defective or mis wired Sound system or transmitter input is turned down Transmitter gain audio level is far too high Check audio level meter on transmitter as it is being used Refer to Installation amp Operation section for details on gain adjustment Receiver output may be mismatched with the headset or earphone Adjust output level on receiver to the correct level for the headset or earphone Excessive wind noise or breath pops Reposition microphone and or use a larger windscreen Transmitter gain audio level far too low Receiver antenna missing or obstructed The IFBR1 IFBR1a headset cable is the antenna Transmitter antenna missing or mismatched Check that the correct antenna is being used Operating range too great Defective remote antenna or cable Antenna2. begin blinking to indicate that the frequency has been removed from the group LECTROSONICS INC Multi Frequency IFB Transmitter Rear Panel Controls and Functions IFBT4 Rear Panel XLR Jack A standard XLR female jack accepts a variety of input sources depending on the setting of the rear panel MODE switches XLR pin functions can be changed to suit the source depending on the positions of the individual switches For detailed information on the setting of these switches see the Installation and Operation section MODE Switches The MODE switches allow the IFBT4 to accommodate a variety of input source levels by changing the input sensitivity and the pin functions of the input XLR jack Marked on the rear panel are the most common set tings Each setting is detailed below Switches 1 and 2 adjust the XLR pin functions while switches 3 and 4 adjust the input sensitivity Rio Rancho NM Switch Positions Input Name 123 4 XLR Pins Balanced Sensitivity CC VVVA 3 Audio No 10 dBu 1 Common MIC A A AV 2 Hi Yes 42 dBu 3 Lo 1 Common LINE AAVV 2 Hi Yes 0 dBu 3 Lo 1 Common RTS1 AVVY 2 Hi No 0 dBu 1 Common RTs2 VWVVVYV 3 Hi No 0 dBu 1 Common Power Input Connector The IFBT4 is designed to be used with the CH20 exter nal or equivalent power source The nominal voltage to operate the unit is 12 VDC although it will operate at voltages as low as 6 VDC and as high as 18 VDC External p
3. by phone We need to know the nature of the problem the model number and the serial number of the equipment We also need a phone number where you can be reached 8 A M to 4 P M U S Mountain Standard Time B After receiving your request we will issue you a return authorization number R A This number will help speed your repair through our receiving and repair departments The return authorization number must be clearly shown on the outside of the shipping container C Pack the equipment carefully and ship to us shipping costs prepaid If necessary we can provide you with the proper packing materials UPS is usually the best way to ship the units Heavy units should be double boxed for safe transport D We also strongly recommend that you insure the equipment since we cannot be responsible for loss of or dam age to equipment that you ship Of course we insure the equipment when we ship it back to you Lectrosonics USA Mailing address Lectrosonics Inc PO Box 15900 Rio Rancho NM 87174 USA Web www lectrosonics com Lectrosonics Canada Mailing Address 49 Spadina Avenue Suite 303A Toronto Ontario M5V 2J1 Rio Rancho NM Shipping address Lectrosonics Inc 581 Laser Rd Rio Rancho NM 87124 USA E mail sales lectrosonics com Telephone 416 596 2202 877 753 2876 Toll free 877 7LECTRO 416 596 6648 Fax Telephone 505 892 4501 800 821 1121 Toll free 505 892 624
4. the absence of adverse conditions for a fuller bass response Press MENU to return to the Setup window LECTROSONICS INC COMPAT Setup Screen The COMPAT setup screen selects the current compatibility mode for interoperation with various types of receivers The avail able modes are IFB Lectrosonics IFB compatibility mode This is the default setting and is the appropriate setting to use with the Lectrosonics IFBR1A or a compat ible IFB receiver 400 Lectrosonics 400 Series This mode offers the best audio quality and is recommended if your receiver supports it 100 Lectrosonics 100 Series compatibility mode 200 Lectrosonics 200 Series compatibility mode MODE 3 and MODE 6 Compatible with certain non Lectrosonics receivers Press MENU to return to the Setup window IFBT4 Menu Diagram Main Window UP DOWN UP DOWN d Press MENU Press Frequency Window To Adjust il Press MENU Press l A A Audio Input Gain Window To Adjust f Press MENU TUNING Setup Screen Multi Frequency IFB Transmitter The TUNING setup screen allows GHA selection of one of four factorv set frequencv groups Groups A through D two user pro grammable frequencv groups Groups U and V or the choice to not use groups at all In the four factorv set frequencv groups eight frequen cies per group are preselected These frequencies are chosen to be free of intermodulation prod
5. 3 Fax E mail Sales colinb lectrosonics com Service joeb lectrosonics com 15 Ua LIMITED ONE YEAR WARRANTY The equipment is warranted for one year from date of purchase against defects in materials or workmanship provided it was purchased from an authorized dealer This warranty does not cover equipment which has been abused or damaged by careless handling or shipping This warranty does not apply to used or demonstrator equipment Should any defect develop Lectrosonics Inc will at our option repair or replace any defective parts without charge for either parts or labor If Lectrosonics Inc cannot correct the defect in your equipment it will be replaced at no charge with a similar new item Lectrosonics Inc will pay for the cost of returning your equipment to you This warranty applies only to items returned to Lectrosonics Inc or an authorized dealer shipping costs prepaid within one year from the date of purchase This Limited Warranty is governed by the laws of the State of New Mexico lt states the entire liablility of Lectrosonics Inc and the entire remedy of the purchaser for any breach of warranty as outlined above NEITHER LECTROSONICS INC NOR ANYONE INVOLVED IN THE PRODUCTION OR DELIVERY OF THE EQUIPMENT SHALL BE LIABLE FOR ANY INDIRECT SPECIAL PUNITIVE CONSEQUENTIAL OR INCIDENTAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THIS EQUIPMENT EVEN IF LECTROSONICS INC HAS BEEN ADVISED OF THE POS
6. 400 511 900 Block 20 512 000 537 500 Block 21 537 600 563 100 Block 22 563 200 588 700 Block 23 588 800 607 900 and 614 100 614 300 Block 24 614 400 639 900 Block 25 640 000 665 500 Block 26 665 600 691 100 Block 27 691 200 716 700 export only Block 28 716 800 742 300 export only Block 29 742 400 767 900 export only Block 944 944 100 951 900 Frequencies Channels per block 256 Channel Spacing 100 kHz 0 1 MHz Spurious amp Harmonic Suppression 37 dBc above 1 GHz Frequency Stability 001 10 ppm 25 C Temperature Stability 001 10 ppm from 30 C to 50 C Channel Selection Momentary pushbutton switches TUNE Up and Down Compatibility Modes 6 IFB Digital Hybrid Wireless 400 Series 100 Series 200 Series Mode 3 Mode 6 Pilot Tone 29 997 kHz IFB Mode 32 765kHz 200 Mode 400 Mode step selected 32 768kHz Mode 6 Modulation FM 20 kHz deviation IFB amp 100 Mode 75kHz 200 amp 400 Mode 50kHz Mode 3 and Mode 6 100 Hz to 8 kHz 1 dB IFB MODE system response see Rolloff 30Hz to 20kHz 1dB 200 amp 400 MODE system response see Rolloff Audio Frequency Response FCC Notices Emission designator 180KF3E The IFBT4 transmitter is FCC type accepted under Part 74 470 608MHz 614 806MHz and 944 1 951 9MHz This device complies with FCC radiation exposure limits as set forth for an uncontrolled environment This device should be ins
7. Display UP AI Front Panel Down is y SR Controls MENU UC RF Power Select Attenuators Phase Locked Loop Voltage Final 50 Isolator Power se k Controlled Amplifier o gt 5V E Voltage 11 3 MHz ek 200mA Regulator E 3 3 V Reference Polyt 1 8V olvfuse Power OFF M sv Oscillator TUNE O gt XMT O gt 4 LECTROSONICS INC Multi Frequency IFB Transmitter A user selectable low frequency roll off can be set for 35 Hz or 50 Hz The recommended 50 Hz default set ting helps to remove wind and traffic noise air con ditioner rumble and other sources of undesired low frequency audio The 35 Hz setting offers a fuller range of sound in the absence of adverse conditions Input Limiter A DSP controlled analog audio limiter is employed before the analog to digital converter The limiter has a range of more than 30 dB for excellent overload protec tion A dual release envelope makes the limiter acousti cally transparent while maintaining low distortion It can be thought of as two limiters in series a fast attack and release limiter followed by a slower attack and release limiter The dual release limiter recovers quickly from brief transients but recovers more slowly from sustained high levels keeping audio distortion low while preserv ing short term dynamic changes When the audio meter on th
8. INSTRUCTION MANUAL IFBT4 Synthesized UHF IFB Transmitter Includes Firmware Ver 1 4 SELECT y LECTROSONICS 014 TRANSMITTER TUNE l XMIT Featuring Digital Hybrid Wireless Technology U S Patent 7 225 135 Serial Number LECTROSONICS Purchase Date Nu Rio Rancho NM USA www lectrosonics com IFBT4 2 LECTROSONICS INC Multi Frequency IFB Transmitter Table of Contents General Technical Description iii i EES A INTO eu EE EE A DigitallFlybrid Null e A Audio Rule ten EE A IFBT4 Transmitter Block Die Qrenm cion a A Pa a EaR 4 A a ts a ESEN 5 Audio DSP and Noise Reduction ccoo e an ined idee 5 Pilot Tone Squelch System AAA 5 Frequency Alli aci deis pedal cda cas do iaa ere tar 5 Power RE 5 Microcontroller isaisa kaana aae na a da aa aai Ka aoaaa EERE E aE aa ETT e OASE Daaa a aE aa Sa aana EAE a AEN 5 Transmitter As 5 Antenna NO 5 Front Panel Controls and FUNCHONS cidcid 6 et AE Front GL TE 6 OFF TUNE XMIT SS Witch cita pl da a 6 Power Hlp eege lacras ge ka a tA A es B a A a a 6 Main Wine i i aa a e E A Te TA TEN a ta p kai dab L p EB p std 6 Fre uencv Window EE da 6 Audio Input Gain Wimdow LIAM KEIN HA MARE NHAMMNARE KEMM MNAMEMNAMINAMEMNEEINEMMMNIMMNIMEMNZMMNNZEINEMINEIEINEMEMNAMINEMEMNEMINEEEMNEZEZEEEEZEE 6 le Kine iba fini ii nt a A a e a l alee 6 ROLLOFF e BEE 6 AA AAN ivicsccccscccevacedscestanssduscostonsdendscennescesde Aa r IOE ear tg decephdens
9. Icon in Main Window or Hex Code in Frequency Window Blinking 1 12 PLL is unlocked Retune transmitter Factory service may be required if problem persists LECTROSONICS INC Multi Frequency IFB Transmitter Frequency Blocks and Ranges The table below lists the factory designated frequency ranges available for the IFBT4 Transmitter Each IFBT4 transmitter is built to cover a pre selected range of frequencies a block as shown below The transmitter will tune to any of 256 different frequencies within this factory assigned block except blocks 23 and 944 The block number is determined by this formula 25 6 x Block Lowest frequency MHz in the block To determine a block number from a frequency Freq MHz divided by 25 6 Block number It is handy to remember these formulas in case you do not have a copy of the table For example suppose you need to know which block covers 685 500 MHz which is in the middle of the Block 26 frequency range 685 500 divided by 25 6 26 77734375 The first two digits left of the decimal are the block number In this case 685 500 MHz falls within block 26 UHF Transmitter Antenna Specifications Block 944 is an exception to this block numbering sys tem and depicts the actual frequency of the block since it is a special case in an 8 mHz band with 78 frequency channels The IFB transmitter antennas are color coded to indi cate the frequency block that they op
10. SIBILITY OF SUCH DAMAGES IN NO EVENT SHALL THE LIABILITY OF LECTROSONICS INC EXCEED THE PURCHASE PRICE OF ANY DEFECTIVE EQUIPMENT This warranty gives you specific legal rights You may have additional legal rights which vary from state to state MINS SL LECTROSONICS Kg 581 Laser Road NE Rio Rancho NM 87124 USA e www lectrosonics com 505 892 4501 e 800 821 1121 e fax 505 892 6243 9 sales O lectrosonics com OU DR Y 11 Feb 09
11. avior i e access is al lowed to all 256 available frequencies in the selected receiver module s frequency block When there are no entries the U or V will of course blink However once a frequency has been added to the tuning group this behavior changes to group mode behavior where the MENU button must be pressed and held while either the Up or Down buttons are pressed to access frequencies that are not part of the current tuning group Note Each User Programmable Frequency Group u or v has separate contents We recommend that you consider the larger issue of frequency coordination prior to adding frequencies in order to minimize potential intermodulation problems Start from the Frequency window and verify that a lower case u or v is present next to the transmit ter switch settings While pressing and holding the MENU button press either the Up or Down button to move to one of the 256 available frequencies in the block Whenever the selection comes to rest on a frequency that is in the current group the group tuning mode indicator letter u or v will give a steady indication On frequencies that are not in the group the indicator will blink To add or remove the displayed frequency from the group hold down the MENU button while pressing and holding the Up button The group tuning mode indicator will stop blinking to show that the frequen cy has been added to the group or
12. dehyssibesd vee ud enb A heda ma ba setaraedeqesseibossetseaieendie 7 TUNING Setlip Screen E EE 7 IFBT4 Menu DIAM EE 7 Frequency Window Behavior based on TUNING mode selechons crac ccoo cnn cnn cnn rca rnn cane rn rra 8 User Programmable Frequency Group Behavior cecceesceeeeseneeeeeeceeeecaeeeaeeceeeeeaeeeaeecaeeeeaeeeaeeeeaeeseeeseaeeseaeeeaeeseaeeeaeeseaeesieeenaeeniees 8 Adding Deleting User Programmable Frequency Group Entree 8 Rear Panel Controls and FUNCIONS iii EENS eege 9 IFBT4 Reat EE XUR dai a A oo OI Power Input Conmectot i ii i ee i mi ata e tina ti raa EL hm am siteeadieesceasseedugersdt bese enaena ul a p A pe cates ab E i A atar Installation and Operation ci A a Aa roose K A Anesa SaaS LEa E EFEK EErEE Eia Operating NOS ii di a r E E E E E E E le TUE e ul A Frequency Blocks and Ranges UHF Transmitter Antenna Specifications ooooonnciinnninnn nnnnnncnnnccnnccnnnccn rc 13 DECHE ls 14 Service ANG RAM E A E a a eege 15 Returnin Units for Repair i L ae e 15 Warranty TT Back Cover Rio Rancho NM 3 IFBT4 General Technical Description Introduction Digital Hybrid Technology The IFBT4 IFB transmitter brings DSP capability anda convenient LCD interface to the popular Lectrosonics IFB product line Replacing the venerable IFBT1 trans mitter the IFBT4 retains the same physical size and is fully interchangeable with its predecessor in terms of audio RF and power interfaces The IFBT4 al
13. e LCD display widens slightly as it reaches zero limiting is indicated When the zero changes to a letter C severe limiting and or clipping is indicated Audio DSP and Noise Reduction Lectrosonics IFB systems use a single band compan dor and pre emphasis for exceptional IFB audio quality The IFBT4 performs these traditionally analog functions entirely in the digital domain maintaining historical compatibility while requiring fewer adjustments When the IFBT4 is configured for compatibility with other types of wireless systems such as the Lectrosonics 100 200 and 400 Series and some other brands the DSP stops IFB companding and instead performs the appropriate audio processing for the chosen mode While all of these modes have won acclaim for perform ing well in their respective spheres the 400 Series mode Digital Hybrid Technology offers objectively superior audio performance and is recommended when the receiver is capable of supporting it Pilot Tone Squelch System Lectrosonics IFB systems use a special pilot tone so that valid IFB signals can be distinguished from RF interference During normal operation an IFB receiver will listen for the distinctive pilot tone remaining silent squelched until the pilot tone is detected The pilot tone is located well above audio frequencies and is never passed through to the receiver s audio output The benefit of the pilot tone squelch system is that the receiver will remain mu
14. ency with the front panel Up and Down but tons Position the microphone The microphone should be placed where it will be located during actual use Use the MENU button to navigate to the Audio Input Gain Window While speaking at the same voice level that will be present during actual use observe the audio meter display Use the Up and Down but tons to adjust the audio input gain so that the meter reads close to 0 dB but only rarely exceeds 0 dB limiting 10 Once the transmitter audio gain has been set the receiver and other components of the system can be turned on and their audio levels adjusted Set the power switch on the IFBT4 transmitter to XMIT and adjust the associated receiver and sound sys tem level as required Note There will be a delay between the moment the transmitter is energized and the actual appearance of audio at the receiver output This intentional delay eliminates turn on thumps and is controlled by the pilot tone squelch system LECTROSONICS INC Multi Frequency IFB Transmitter Operating Notes The AUDIO LEVEL control should not be used to control the volume of the associated receiver This gain adjustment is used to match the IFBT4 input level to the incoming signal from the sound source to provide full modulation and maximum dynamic range not to set the volume of the associated receiver If the audio level is too high the audio metering will exceed the O dB level too frequently Th
15. erate within The length of the antenna varies with the frequency block The actual length of the antenna is not as critical as it might appear in the table below The usable band width of the detachable antenna is 50 MHz from the block s center frequency so it is acceptable to use an antenna from an adjacent block above or below the operating frequency if some loss in range can be toler ated Part of block 23 is not used since it covers a 608 to 614 MHz band that is allocated exclusively for use in radio astronomy D 3 S BAR N A N N A N 8 Note Check the scale of your printout This line should be 6 00 inches long 152 4 mm Lectrosonics A500RA UHF BLOCK FREQUENCY CAP ANTENNA transmitter antennas follow RANGE COLOR LENGTH 470 100 495 600 512 000 537 500 1 537 600 563 100 sero Red fer o the color code specifications in the chart below to identify operating frequency block range The frequency block range is engraved on the out side housing for each individ ual transmitter If a situation exists whereby the antenna is defective and the antenna cap is missing refer to the follow ing chart to determine the cor 2 2 2 2 2 rect replacement antenna 2 2 2 2 2 Rio Rancho NM 563 200 588 700 19 0 i 2 3 4 5 6 7 a 8 9 4 l 944 Black w Label 13 IFBT4 Specifications Operating Frequencies MHz Block 470 470 100 495 600 Block 19 486
16. extends all the way to the right and widens somewhat Clipping is indicated when the zero in the lower right corner changes to a capital C The Up and Down buttons are disabled in this Window Frequency Window Pressing the MENU button once from the Main window navigates to the Fre quency window The Frequency window displays the cur rent operating frequency in MHz as well as the standard Lectrosonics hex code for use with transmitters equipped with hex switches Also displayed is the UHF television channel to which the selected frequency belongs Audio Input Gain Window In SMIT mode it is not possible to change the operating frequency In TUNE mode the Up and Down buttons may be used to select a new frequency If the TUNING mode is set to NORMAL the Up and Down buttons navigate in single channel increments and MENU Up and MENU Down move 16 channels ata time In any of the various group tuning modes the currently selected group identifier is displayed to the left of the hex code and the Up and Down buttons navigate among the frequencies in the group In factory group tuning modes A thru D MENU Up and MENU Down jump to the highest and lowest frequencies in the group In user group tuning modes U and V MENU Up and MENU Down permit access to frequencies not currently in the group Pressing and holding the Up or Down button invokes an autorepeat function for faster tuning Pressing the MENU button once from CI t
17. for excellent spectral purity The IFBT4 s clean signal reduces the chances for interference in multiple trans mitter installations Antenna System The 50 Ohm BNC output connector will work with stan dard coaxial cabling and remote antennas IFBT4 Front Panel Controls and Functions IFBT4 Front Panel By LECTROSONICS OFF TUNE XMIT Switch OFF Turns the unit off TUNE Allows all functions of the transmitter to be set up without transmitting The operating frequencv may only be selected in this mode XMIT Normal operating position The operating frequency may not be changed in this mode though other settings may be changed so long as the unit isn t Locked Power Up Sequence When power is first turned on the front panel LCD dis play steps through the following sequence 1 Displays Model and frequency block number e g IFBT4 BLK 25 2 Displays installed firmware version number e g VERSION 1 0 3 Displays the current compatibility mode setting e g COMPAT IFB 4 Displays the Main Window Main Window The Main window is dominated by an K audio level meter which displays the current audio modulation level in real time In TUNE mode a blinking capital T is displayed in the lower left corner to remind the user that the unit is not yet trans mitting In XMIT mode the blinking T is replaced by an antenna icon Audio limiting is indicated when the audio bargraph
18. he Frequency window navigates to the Audio Input Gain window This window greatly resembles the Main window with the exception that the current audio input gain setting is displayed in the upper left corner The Up and Down buttons may be used to alter the setting while reading the realtime audio meter to determine what setting works best The gain range is 18 dB to 24 dB with O dB nominal center The reference for this control can be changed with the rear panel MODE switches See the Installation and Operation section for more information on the MODE switches Setup Window Pressing the MENU button once from the Audio Input Gain window navi gates to the Setup window This window contains a menu which permits access to various setup screens Initially the active menu item is EXIT Pressing the Up and Down keys permits navigation among the remain ing menu items TUNING COMPAT and ROLLOFF Pressing the MENU button selects the current menu item Selecting EXIT navigates back to the Main window Select ing any other item navigates to the associated setup screen ROLLOFF Setup Screen The ROLLOFF setup screen controls the low frequency audio response of the IFBT4 by moving the 3 dB corner of a 4 pole low pass digital filter The 50 Hz setting is the default and should be used whenever wind noise HVAC rumble traffic noise or other low frequency sounds may de grade the quality of the audio The 35 Hz setting may be used in
19. is condi tion may reduce the dynamic range of the audio signal If the audio level is too low the audio metering will be too far below the O dB level This condition may cause hiss and noise in the audio or pumping and breathing in the background noise Accessories CH20 Power supply for IFB base transmitters with locking LZR power jacks 110 VAC input 12 VDC regulated output 400 mA max 21586 DC16A Pigtail power cable LZR stripped amp tinned SNA600 Collapsible dipole antenna that adjusts over a wide frequency range Ideal for situations where a full 360 degree receiving pattern is required as op posed to a directional pattern ALP Series Antennas ALP500 ALP620 amp ALP650 Shark Fin style Log Periodic Dipole Array LPDA Antennas that provide a useful directional pattern over a broad frequency bandwidth Ideal for portable applications including temporary setups for field production ALPKIT Stainless steel kit for mounting SNA600 and ALP Series antennas on photo and video tripods light ing equipment and standard microphone stands ARG15 ARG100 Coaxial cables for remote antennas available from Lectrosonics in a variety of lengths from 2 to 100 ft RMP195 4 channel rack mount for up to four IFBT4 transmitters Rocker switch included to work as a master power switch if desired Rio Rancho NM The input limiter will handle peaks over 15 dB above full modulation regardless of the gain control setti
20. left of the transmit ter switch settings in the Frequency window The letter identifies the selected factory or user tuning group Any time the currently tuned frequency is not in the current group this group identification letter will blink Any time the currently tuned frequency is in the current tun ing group the group tuning mode indicator will give a steady non blinking indication In any of the group modes the Up and Down buttons navigate among the selected intermod free frequen cies in the group In factory groups A through D the MENU Up and MENU Down shortcuts jump to the first and last frequencies in the group In user groups U and V MENU Up and MENU Down permit access to frequencies not already in the group User Programmable Frequency Group Behavior The user programmable frequency groups U or V work very similarly to the factory groups with a few exceptions The most obvious difference is the ability to add or remove frequencies from the group Less obvious is the behavior of a user programmable frequency group with only one entry or with no entries A user programmable frequency group with only one en try continues to display the single frequency stored in the group no matter how many times the Up or Down buttons are pressed provided the MENU button is not pressed at the same time The U or V will not blink A user programmable frequency group with no entries reverts to non group mode beh
21. ng Oc casional limiting is often deemed desirable indicating that the gain is correctly set and the transmitter is fully modulated for optimum signal to noise ratio Different voices will usually require different audio input gain settings so check this adjustment as each new person uses the system If several different people will be using the transmitter and there is not time to make the adjust ment for each individual adjust it for the loudest voice SNA600 ARG15 ARG25 ARG100 RMP195 RA IFBT4 Troubleshooting NOTE Always ensure that the COMPAT compatibility setting is the same on both transmitter and receiver A variety of different symptoms will occur if the settings do not match With the IFBR1a receiver no sound will be heard unless the transmitter is set to the IFB mode When used with receivers other than the IFBR1a a variety of symptoms will occur when the COMPAT settings do not match ranging from no sound to level inconsistencies to distortion of various degrees See the section entitled Front Panel Controls and Functions for details on the available compatibility modes and how to select them Symptom Possible Cause Display Dead 1 External power supply disconnected or inadequate 2 The External DC power input is protected by an auto reset polyfuse Disconnect power and wait about 1 minute for the fuse to reset No Transmitter Modulation 1 Audio input gain setting turned all the way down
22. ower sources must be able to supply 200 mA continuously The connector dimensions are shown below Lectroson ics P N 21425 has a straight back shell P N 21586 has a locking collar gs Straight or with locking collar Center pin Antenna The ANTENNA connector is a standard 50 ohm BNC type for use with standard coaxial cabling and remote antennas IFBT4 Installation and Operation 1 The IFBT4 transmitter is shipped with pin 1 of the XLR input connector tied directly to ground Ifa floating input is desired a Ground Lift Jumper is provided This jumper is located inside the unit on the PC board near the rear panel XLR jack For floating input open the unit and move the Ground mmiri Ground Position Cum Lift Position Lift Jumper to the desired location Location of Ground Lift Jumper 2 3 19 Fleta Set the MODE switches on the rear panel to match the specific input source to be used See MODE Switches Insert the power supply plug into the 6 18 VDC jack on the rear panel Insert the microphone or other audio source XLR plug into the input jack Ensure that the pins are aligned and that the connector locks into place Attach the antenna or antenna cable to the BNC connector on the rear panel Set the OFF TUNE XMIT switch to TUNE Press the MENU button to display the Frequency Window and adjust the transmitter to the desired frequ
23. so offers new features such as selectable LF roll off and com patibility with Lectrosonics 100 200 and 400 Series systems as well as some other popular brands The IFBT4 features a graphics type backlit LCD display with a menu system similar to those featured in our 400 Series receivers The IFBT4 can be Locked to prevent a user from changing any settings but still allow brows ing of the current settings The IFBT4 can be powered from any external DC source of 6 to 18 Volts at 200 milliamps maximum or from the provided 12 Volt power supply with a locking power connector The unit has an internal self resetting fuse and reverse polarity protection The IFBT4 is housed in a machined aluminum case with a tough electrostatic powder coating The front and rear panels are anodized aluminum with laser etched engraving The included antenna is a right angle 4 wavelength monopole with a BNC connector construct ed of polymer coated flexible steel cable These features along with the 250 milliwatt RF output and a wide range of selectable audio input types and levels make the IFBT4 an excellent choice for long range IFB applications and other long range wireless audio needs The IFBT4 features Lectrosonics Digital Hybrid Technol ogy for full compatibility with all of the Lectrosonics 400 Series and Venue receivers The Lectrosonics Digital Hybrid system in the 400 Series mode overcomes channel noise and compandor artifacts in a drama
24. talled and operated so that its antenna s are not co located or operating in conjunction with any other antenna or transmitter A separation distance of at least 20cm 8 inches must be maintained to comply with the FCC Radio Frequency Maximum Permissible Exposure MPE requirements 14 Low frequency audio rolloff Signal to Noise Ratio RF Power Output Output Impedance Audio Input Levels Audio Input Config Audio Input Impedance Gain Control Range Audio Input Jack Input Power Power Input Jack Indicators Front panel controls Rear panel controls Weight Size Menu selectable for 3 dB down at 35 Hz or 50 Hz 90 dB typical A weighted 250 mW nominal 50 Ohms 0 dBu for Line RTS1 4 RTS2 10 dBu for Clear Com 42 dBu for mic dry inputs 50 VDC max Balanced and Unbalanced rear panel selectable for Line Mic RTS 1 RTS 2 and Clear Com Greater than 2 K balanced greater than 1 K unbalanced at any gain setting 18 dB to 24 dB 0 dB nominal center software selectable Standard XLR female connector 12 to 14 VDC typical 200 mA max Max input range 6 to 18 VDC Coax type locking LZR RL26AE Backlit Liquid Crystal Display Displays modulation meter frequencies modes audio rolloff audio level and tuning groups e MENU momentary pushbutton switc e Power OFF TUNE XMIT 3 position slide switch e Select Up momentary pushbutton switch Select Down momentary pushbutton s
25. ted until it receives the pilot tone from the matching transmitter even if a strong interfer ing RF signal is present on the carrier frequency of the system When the IFBT4 is operated in compatibility modes other than IFB it generates pilot tones as appropriate for the chosen mode Rio Rancho NM Frequency Agility The IFBT4 transmitter uses a synthesized frequency selectable main oscillator The frequency is extremely stable over a wide temperature range and over time The transmitter s standard tuning range covers 256 fre quencies in 100 kHz steps over a 25 6 MHz band This flexibility significantly helps avoid interference problems in mobile or traveling applications Power Delay When powering the transmitter on and off and when switching between the XMIT and TUNE modes intel ligent circuitry adds brief delays in order to allow time for circuits to stabilize both locally and in the matching receiver These delays prevent clicks thumps or feed back from entering the sound system Microcontroller The microcontroller oversees most system operations including RF frequency and output DSP audio func tions buttons and display and more User settings are stored in non volatile memory so they are retained even when the power is turned off Transmitter The IFBT4 transmitter operates at a high RF power level to ensure a clean signal free of dropouts and noise All transmitter circuits are buffered and filtered
26. tically new way digitally encoding the audio in the transmitter and decoding it in the receiver yet still sending the en coded information via an analog FM wireless link This proprietary algorithm is not a digital implementation of an analog compandor but a technique which can be ac complished only in the digital domain As of this writing the patent is still pending Audio Input Interface The standard 3 pin XLR connector on the rear panel handles all audio inputs The four DIP switches allow setting the input sensitivity for low levels such as micro phone inputs or for high levels such as line inputs bal anced or unbalanced The switches also offer special settings to provide the proper input configurations to match to Clear Com RTS1 and RTS2 intercom sys tems Pin 1 of the XLR input connector is normally con nected to ground but an internal jumper can be moved if a floating input is desired While the XLR input does not offer phantom power it is fully compatible with standard 48 Volt phantom power Phantom supplied microphones may be connected to the IFBT4 without the need for DC isolation IFBT4 Transmitter Block Diagram XLR Input Connector A D D A Converter Converter vl Ye 11001001 11001001 Digital Signal Processor Cn SCH AS W AT Microprocessor 11 3MHz Reference Shunt Limiter Py Graphic LCD
27. to correct or isolate the trouble before concluding that the equipment needs repair Make sure you have followed the setup procedure and operating instructions Check the interconnect ing cables and then go through the Troubleshooting section in this manual We strongly recommend that you do not try to repair the equipment yourself and do not have the local repair shop attempt anything other than the simplest repair If the repair is more complicated than a broken wire or loose connec tion send the unit to the factory for repair and service Don t attempt to adjust any controls inside the units Once set at the factory the various controls and trimmers do not drift with age or vibration and never require readjustment There are no adjustments inside that will make a malfunctioning unit start working LECTROSONICS Service Department is equipped and staffed to quickly repair your equipment In warranty repairs are made at no charge in accordance with the terms of the warranty Out of warranty repairs are charged at a modest flat rate plus parts and shipping Since it takes almost as much time and effort to determine what is wrong as it does to make the repair there is a charge for an exact quotation We will be happy to quote approximate charges by phone for out of warranty repairs Returning Units for Repair For timely service please follow the steps below A DO NOT return equipment to the factory for repair without first contacting us by email or
28. ucts Refer to receiver manual for more information In the two user programmable frequency groups up to 16 frequencies can be programmed per group Note The TUNING Setup Screen only selects the tuning mode NORMAL or Group tuning and not the operating frequency Actual operating frequencies are chosen through the Frequency Window Press MENU to return to the Setup window Display External Power Voltage added feature with firmware Ver 1 4 Press MENU l Setup Window Y ee Press DOWN Press MENU A paneer Press MENU _7 i Ka N Press Up d Press UP DOWN to select Press DOWN N 7 Press MENU 4 Press MENU Fi y Press UP y Press UP DOWN to select p Press DOWN Press MENU Press MENU y Y N Press UP Ne Press UP DOWN to select B Press DOWN Rio Rancho NM IFBT4 Frequency Window Behavior based on TUNING mode selections Adding Deleting User Programmable Frequency Group Entries If NORMAL tuning mode is selected the Up and Down buttons select the operating frequency in single chan nel 100 kHz increments and the MENU Up and MENU Down shortcuts tune in 16 channel 1 6 MHz increments There are two classes of group tuning factory preset groups Grp A through D and user programmable fre quency groups Grp U and V In any of the group modes a lower case a b c d u or v will be displayed to the immediate
29. witch Input Mode Select 4 section DIP switch 9 oz 5 25 x 3 25 x 1 25 including connectors Specifications subject to change without notice Industry Canada Notices Operation of this device is subject to the following two conditions 1 this device may not cause interference and 2 this device must accept interference including interference that may cause undesired operation of the device This device has been designed to operate with the antennas listed below and having a maximum gain of 6 dB Antennas not included in this list or having a gain greater than 6 dB are Strictly prohibited for use with this device The required antenna impedance is 50 ohms e Lectrosonics model A500RA whip antenna e Lectrosonics model SNA500 dipole antenna Power listed is conducted The antenna s used for this transmitter are to be fixed mounted on indoor permanent structures providing a separation distance of at least 20 cm from all persons during normal operation The maximum radiated output power at each antenna must satisfy the MPE Categorical Exclusion Requirements of 2 1091 To reduce potential radio interference to other users the antenna type and its gain should be so chosen that the equivalent isotropically radiated power e i r p is not more than that permitted for successful communication LECTROSONICS INC Multi Frequency IFB Transmitter Service and Repair If your system malfunctions you should attempt
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