Lectrosonics IFBT4V Low Power Auxiliary Base Station User Manual IFBT4man indd

Lectrosonics Inc Low Power Auxiliary Base Station IFBT4man indd

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IFBT4V User Manual

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T4Multi-Frequency IFB TransmitterINSTRUCTION MANUALRio Rancho, NM, USAwww.lectrosonics.comFill in for your records: Serial Number: Purchase Date:Featuring Digital Hybrid Wireless™ Technology

T4LECTROSONICS, INC.2

T4LECTROSONICS, INC.4The T4 IFB Transmitter is comprised of a number of functional subsystems, including Audio Input Interface, DSP Audio Processor and Pilot Tone, Frequency Syn-thesizer, Microcontroller, Transmitter, Antenna System and Power Supply. (See block diagram.)The T4 is designed to operate primarily with the Lectro-sonics R1 and R1A IFB receivers, and is also capab-able of operating with the Lectrosonics 100 Series, 200 Series, 400 Series receivers. The T4 features micro-processor control of 256 operating frequencies within any one of at least nine UHF frequency bands and the 944MHz band.The T4 uses 20 kHz deviation in the IFB and 100 series modes for an efﬁ cient use of bandwidth. The 200 Series and 400 Series modes use 75kHz bandwidth for high signal to noise ratio. The transmitter circuits are all regulated for frequency stability and high audio per-formance. The input ampliﬁ er is a discreet differential circuit which can be adjusted to allow the use of many different input sources with robust overload capability without clipping.Audio Input InterfaceThe input sensitivity and XLR pin functions can be cus-tomized using a DIP switch located on the back panel. Different combinations of gain and input conﬁ gurations are possible without rewiring the mic connector. Pin 1 of the XLR input connector is normally connected directly to ground but an internal jumper can be moved if a ﬂ oating input is desired.The Audio (+) and (–) are “dry” inputs and can each withstand +/- 50 VDC. Audio DSP and Noise ReductionThe original Lectrosonics IFB system was designed with single band compand ing which is an audio device that processes (compresses) the input signal so that the large dynamic ranges of the input signals can be transmitted to the receiver without overload or noise. A complementary system in the receiver recovers (de-compresses) the original dynamics of the signal for full audio quality. Compression and expansion ratios are complementary at 2:1. High frequency pre-emphasis is implemented in the transmitter to provide another 10 dB signal to noise improvement. Matching de-emphasis is provided in all receivers.The IFBT4 is designed with Audio Digital Signal Proces-sor algorithms that digitally emulate the original com-pandor circuits in order to maintain compatability with the IFBR1/IFBR1a, 100 Series, and 200 Series receiv-ers using the same analog FM links. This same DSP circuitry also provides an algorithm compatible with the Lectosonics Digital Hybrid Wireless™ 400 Series systems and eliminates the need for pre-emphasis and de-emphasis.General Technical DescriptionT4 IFB Transmitter Block Diagram

Multi-Frequency IFB TransmitterRio Rancho, NM 5 Pilot ToneThe T4/R1A system uses an ultrasonic tone modula-tion of the carrier to operate the receiver squelch. This “pilot tone” consists of a 29.997 kHz signal in the DSP and is mixed with the audio signal to the FM modulator. The pilot tone controls the audio output muting of the receiver and is ﬁ ltered out of the audio signal immedi-ately after the detector in the receiver so that it does not inﬂ uence the compandor or various gain stages.The beneﬁ t of the pilot tone squelch system is that the receiver will remain muted until it receives the pilot tone from the matching transmitter, even if a strong RF sig-nal is present on the carrier frequency of the system. The T4 DSP also generates pilot tones to operate with the 200 Series and 400 Series receivers as well as several other popular system receivers.Frequency SynthesizerThe transmitter uses a synthesized, frequency select-able main oscillator. The frequency is extremely stable over a wide temperature range and over time. The push-button switches, located on the front panel of the unit, provides the user access to set 256 frequencies in 100 kHz steps over a 25.5 MHz range. This signiﬁ cantly alleviates carrier interference problems in mobile or traveling applications.Power DelayThere is a ﬁ ve second power-ON/OFF delay to prevent audio thumps when switching from XMIT to TUNE or from TUNE to OFF. This delay also gives the Frequency Synthesizer time to fully stabilize. When the transmitter is powered OFF, the Pilot Tone is ﬁ rst turned off muting the audio at the receiver before the rest of the transmit-ter is powered down. This prevents clicks, thumps or feedback from entering the sound system. MicrocontrollerFrequency adjustment and display are handled by the microprocessor. Nonvolatile memory is provided for holding the last frequency used, even if power is removed from the unit for any length of time. Each time the transmitter is powered up, it will display the last frequency used.TransmitterThe T4 transmitter operates at 250 mW, more power-ful than most IFB systems on the market today. The higher power ensures a clean signal free of dropouts and noise. The transmitter circuits are buffered and ﬁ ltered for exceptional spectral purity. The extra clean signal that results reduces the chances for interference between multiple transmitter installations.Antenna SystemThe antenna on the T4 consists of a ﬂ exible 1/4 wave-length bronze cable, detachable via a BNC connector. The 50 ohm output connector works conveniently with a variety of remote antennas for installation in studios and production trucks & vans.

T4LECTROSONICS, INC.6icon to indicate transmit (XMIT) mode. The MENU button is then used to navigate to the other function windows, see page..7? indicates the channel (or oper-ating) frequency of the unit to the nearest 0.1 MHz (100 kHz). The LED display also indicates low input power by blinking continuously when the input voltage drops below 11.0 Volts.Select Buttons (Up and Down)After stepping to a window using the MENU button the UP and DOWN and MENU buttons are used to further navigate to a selection choice. When the selection is made the choice is entered into the processor by press-ing the MENU again. For example, from the MAIN window press the MENU button once to display the Audio Input level set window. Pressing the UP button increases the input gain and pressing the DOWN button decreases the input gain. Likewise, press the MENU button twice from the main window to display the Frequency window. The transmit-ter frequency is then changed by pressing the UP or DOWN button. Each push will change the frequency, up or down, in 100 kHz increments, or one channel at a time. The FREQ buttons are enabled when the OFF/TUNE/XMIT switch is in the TUNE position. The frequency can be stepped a single frequency channel at a time by a momentary push or if a selected FREQ button is pressed for more than two seconds, the speed of change increases to about ﬁ ve channels per second. Also, large increment steps can be made by holding in the MENU button while momentarily pressing the UP or DOWN button. The T4 will “remember” the last channel selected when the unit is turned off, and it will set itself to that frequency when the unit is reenergized.When the switch is in the XMIT mode, pressing the FREQ up/down buttons will not disturb the frequency or the transmitter signal output. Note: When the highest or lowest frequency is reached, the unit will wrap around and continue in the same direction at the other end of the range. RolloffThe low frequency rolloff is normally 3dB down at 35 Hz. The rolloff can be changed to 50 Hz by navigating to the ROLLOFF window and using the UP or DOWN button to select the desired rolloff. Pressing MENU then enters the setting into the processor.Audio Level ControlThe Audio Level Control is used to adjust the audio input level for proper modulation. The gain range is +24dB to -18dB. 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.T4 Front PanelOFF/TUNE/XMIT SwitchOFF Turns the unit off.TUNE Mutes the transmitter RF output section while enabling all of the menus as well as the up and down select buttons for setting the operating frequency and all other functions of the transmit-ter.XMIT Normal operating position. With the switch the XMIT position, the unit is transmitting a modu-lated signal to the corresponding receiver except the ability to change frequency is locked out. The switch must be set to TUNE position in or-der to change the frequency. In XMIT position the buttons allow to display the transmitter HEX switch settings, the operating frequency and the TV channel and also allow the use of the menus to adjust the Audio Level and Rolloff .Power Up SequenceWhen the OFF/TUNE/XMIT switch is ﬁ rst turned on, the front panel LCD display cycles through the following sequences:1. Displays Model and frequency block number: IFBT4 BLK 25 (example)2. Displays installed ﬁ rmware version number: VER-SION 1.0 (example)3. Displays the current compatibility mode setting: COMPAT IFB (example)1. “TEST MODE” momentarily illuminating all display segments (8.8.8.8.)2. Momentarily displays ﬁ rmware version number, (i.e. 4.0)3. Displays operating frequency in MHz.LCD DisplayThe LCD is a backlit graphic type liquid crystal display that is used to monitor the unit operation and to con-ﬁ gure the IFBT4 for desired settings. Upon initial power up, the display defaults to the MAIN window that displays an active audio VU meter and an icon in the shape of a “T” to indicate TUNE mode or an antenna Front Panel Controls and Functions

Multi-Frequency IFB TransmitterRio Rancho, NM 7T4 Menu Diagram

T4LECTROSONICS, INC.8T4 Rear PanelXLR JackA standard XLR female jack accepts a variety of input sources depending on the setting of the MODE dip switch. 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 OPERA-TION section.Mode Switches Switch Positions Input Name 1 2 3 4 XLR Pins Balanced Sensitivity CC TTTS 3 = Audio No -10 dBu 1 = Common MIC SSST 2 = Hi Yes -42 dBu 3 = Lo 1 = Common LINE SSTT 2 = Hi Yes 0 dBu 3 = Lo 1 = Common RTS1 STTT 2 = Hi No 0 dBu 1 = Common RTS2 TTTT 3 = Hi No 0 dBu 1 = CommonRear Panel Controls and FunctionsThese dip switches conﬁ gure the XLR input jack to ac-commodate a variety of audio sources. The rear panel is marked with the most common switch combinations.The MODE switches allow the T4 to accommodate a variety of input sources by changing the input sensitiv-ity and the pin functions of the input XLR jack. Marked on the rear panel are the most common settings. Each setting is detailed below. Switches 1 and 2 adjust the XLR pin functions while switches 3 and 4 adjust the input sensitivity. (mode switch chart here)12 VDC (Power Input Connector)The T4 is designed to be used with the CH20 external (or equivalent) power source, which is plugged into the 6-18 VDC external power input connector. 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.A suitable alternate power source must be able to handle 200 mA continuous consumption.AntennaThe T4’s ANTENNA connector is a standard 50 ohm BNC conﬁ guration, which can accept an integral whip or a cable to a remote antenna.

Multi-Frequency IFB TransmitterRio Rancho, NM 91) The T4 transmitter is shipped with pin 1 of the XLR input connector tied directly to ground. If a ﬂ oating 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. If a ﬂ oating connection is desired, open the unit and move the Ground Lift Jumper to the desired location.Location of Ground Lift Jumper:Installation and Operation2) Set the MODE switches on the rear panel to match the speciﬁ c input source to be used. (See Mode Switches.)3) Insert the power supply plug into the 6-18 VDC jack on the rear panel.4) Insert the microphone XLR plug into the input jack. Ensure the pins are aligned and that the connector locks in.5) Attach the antenna (or antenna cable) to the BNC connector on the rear panel.6) Mute the sound source connected to the T4.7) Set the OFF/TUNE/XMIT switch to TUNE.8) Step MENU to the frequency/channel window and adjust the transmitter to the desired frequency with the front panel FREQ up/down buttons.9) Position the microphone. The microphone should be placed in the position in which it will be used during the program.10) Step the MENU button to the LEVEL window. While speaking at the same voice level that will be used during the program, observe the display audio meter. Using the DOWN button, set the AUDIO LEVEL gain to a low level, -10 or -18 so that the au-dio peaks are well below 0dB limiting on the scale. Then gradually adjust the AUDIO LEVEL gain with the UP button until the audio meter occasionally peaks at the maximum of 0dB on the scale“. -There is over 15 dB of limiting range without overload above the “0” indication. It is desirable that the audio peaks at or slightly above 0dB about 5-10 percent of the time during use.11) Once the transmitter audio gain has been set, the receiver and other components of the system can be energized and their audio levels adjusted. Set the power switch on the T4 transmitter to the 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 when audio will actually appear at the receiver output. This intentional delay eliminates turn on thumps, and is controlled by the pilot tone squelch control.

T4LECTROSONICS, INC.10AccessoriesCH20 Power supply for IFB base transmitters with locking LZR power jacks; 110 VAC input, 12 VDC regulated output; 400 mA max.21586DC16A Pigtail power cable, LZR to strip & tinSNA600Collapsible 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.ALP600Shark Fin style Log Periodic Dipole Array (LPDA) that provides a useful directional pattern over a broad frequency bandwidth. Ideal for portable applications including temporary setups for ﬁ eld production.ALPKITStainless steel kit for mounting SNA600 and ALP600 antennas on photo and video tripods, light-ing equipment, and standard microphone stands.ARG15/ARG100Coaxial cables for remote antennas available from Lectrosonics in a variety of lengths from 2 to 100 ft. RMP1954 channel rack mount for up to four T4 IFB receivers. Rocker switch installed to work as a mas-ter power switch if desired.Operating NotesThe AUDIO LEVEL control should not be used to control the volume of the associated receiver. This gain adjustment is used to match the T4 input level to the incoming signal from the sound source to provide full modulation and maximum dynamic range. If the audio level is too high — the audio metering will exceed the 0dB level too frequently. This 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 0dB level. This condition may cause hiss and noise in the audio, or pumping and breathing in the background noise.The input limiter will handle peaks over 15 dB above full modulation, regardless of the gain control setting. The limiter uses a true absolute value circuit to detect both positive and negative peaks. The attack time is 5 milliseconds and the release time is 200 milliseconds. Occasional limiting is 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 settings of the AUDIO LEVEL control, 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.CH20SNA600ALP600ARG15/ARG100RMP195

Multi-Frequency IFB TransmitterRio Rancho, NM 11TroubleshootingSymptom: 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 10 seconds for the fuse to reset.No Transmitter Modulation 1) AUDIO LEVEL turned all the way down. 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 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)T ransmitter antenna not connected. 6) Transmitter switch in the TUNE position. Switch to XMIT mode.No Sound (or Low Sound Level), and Receiver LED is On 1) Receiver output level set too low. 2) Receiver earphone cable is defective or mis-wired. 3) Sound system or transmitter input is turned down.Distorted Sound 1) Transmitter gain (audio level) is far too high. Check mod level lamps on transmitter as it is being used. (Refer to Installation & Operation section for details on gain adjustment.) 2) Receiver output may be mismatched with the headset or earphone. Adjust output level on receiver to the correct level for the headset or earphone. 3) Excessive wind noise or breath “pops.” Reposition microphone and/or use a larger windscreenHiss, Noise, or Audible Dropouts 1) Transmitter gain (audio level) far too low. 2) Receiver antenna missing or obstructed. (The headset cable is the antenna.) 3) Transmitter antenna missing or mismatched. Check that the correct antenna is being used 4) Operating range too great. 5) Defective remote antenna or cable.

T4LECTROSONICS, INC.12Frequency Blocks and RangesThe table below lists the factory designated frequency ranges available for the T4 IFB Transmitter. Each T4 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.The block number is determined by this formula:25.6 × Freq. (MHz) = Lowest freq. (MHz) in the blockTo determine a block number from a frequency:Freq. (MHz) divided by 25.6 = Block numberIt 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 FREQUENCY ANT SLEEVE ANTENNABLOCK RANGE (MHz) COLOR WHIP LENGTH 21 537.600 - 563.100 Brown 4.74” 22 563.200 - 588.700 Red 4.48” 23 588.800 - 614.300 Orange 4.24” 24 614.400 - 639.900 Yellow 4.01” 25 640.000 - 665.500 Green 3.81” 26 665.600 - 691.100 Blue 3.62” 27 691.200 - 716.700 Violet (Pink) 3.46” 28 716.800 - 742.300 Grey 3.31” 29 742.400 - 767.900 White 3.18” 944 944.100 - 951.900 Black 3.10” The ﬁ rst two digits left of the decimal are the block number. In this case, 685.500 MHz falls within block 26. Block 944 is an exception to this block numbering sys-tem and depicts the actual frequency of the block since it is only a 6MHz band with 78 frequency channels.The T4 IFB transmitter antennas are color coded to indicate the frequency block that they operate within. The length of the antenna varies with the frequency block. The actual length of the antenna is not as criti-cal as it might appear in the table below. The usable bandwidth 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 tolerated.Part of block 23 is not used since it covers a 608 to 614 MHz band that is illegal for use with wireless micro-phones.

Multi-Frequency IFB TransmitterRio Rancho, NM 13Speciﬁ cationsOperating Frequencies (MHz): Block 21 537.600 - 563.100 Block 25 640.000 - 665.500 Block 22 563.200 - 588.700 Block 26 665.600 - 691.100 Block 23 588.800 - 607.900 Block 27 691.200 - 716.700 614.100 - 614.300 Block 28 716.800 - 742.300 Block 24 614.400 - 639.900 Block 29 742.400 - 767.900 Block 944 944.100 – 951.9Frequencies (Channels per block): 256Channel Spacing: 100 kHz (0.1 MHz)Spurious & Harmonic Suppression: 37 dBc above 1 GHzFrequency Stability: ±.001% (10 ppm) @ 25° CTemperature Stability: ±.001% (10 ppm) from -30° C to +50° CChannel Selection: Momentary pushbutton switches, TUNE Up and DownCompatibility Modes (6) Digital Hybrid Wireless(tm) (400 Series), 100 Series, 200 Series, Mode 3, Mode 6, and IFBPilot Tone: 29.997 kHz IFB & 100 MODE, 32.765kHz 200 MODE, 400 MODE step selectedModulation: FM, ±20 kHz deviation IFB & 100 MODE, ±75kHz 200 & 400 MODEAudio Response: 100 Hz to 10 kHz, ±1 dB, -3dB, IFB MODE system response 50Hz to 20kHz ±1dB , 200 & 400 MODE system responseAudio Compressor: 2 to 1 IFB, 100, and 200 ModeRF Power Output: 250 mw (nominal)Output Impedance: 50 ohmsAudio Input Levels: 0 dBu for Line, RTS1 & RTS2. -10 dBu for Clear Com, and -42 dBu for mic dry inputs, +/-50Vdc max, Audio Input Conﬁ g: Balanced and Unbalanced, rear panel selectable for Line, Mic. RTS 1, RTS 2, and Clear CommAudio Input Impedance: Greater than 2 K balanced, greater than 1 K unbalanced at any gain settingGain Control Range: ±20 dB, Menu selectableAudio Input Jack: Standard XLR female connectorInput Power: 12 to 14 VDC typical, 200 ma. max.; Max. Input Range 6 to 18 VDCPower Input Jack: Coax type, locking LZR RL26AEIndicators: Backlit Liquid Crystal Display. Displays modulation meter, frequencies, modes, rolloff, audio level, and tuning groups.Front panel controls: MENU momentary pushbutton switch Power OFF-TUNE-XMIT, 3 position slide switch Select Up momentary pushbutton switch Select down momentary pushbutton switchRear panel controls: Input Mode Select, 4 section DIP switchWeight: 9 oz.Size: 5.25” long (including connectors) x 3.25” wide x 1.25” highSpeciﬁ cations subject to change without notice.Emission designator: 180KF3EThe T4 IFB transmitter is FCC type accepted under Part 74: 470 - 608MHz, 614 - 806MHz and 944.1 – 951.9MHz.The FCC requires that the following statement be included in this manual:This device complies with FCC radiation exposure limits as set forth for an uncontrolled environment. This device should be installed 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.

T4LECTROSONICS, INC.14Service and RepairIf your system malfunctions, you should attempt 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 ﬂ at 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 RepairFor timely service, please follow the steps below:A. DO NOT return equipment to the factory for repair without ﬁ rst contacting us by letter or 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.Mailing address: Shipping address: Telephone:Lectrosonics, Inc. Lectrosonics, Inc. (505) 892-4501PO Box 15900 581 Laser Rd. (800) 821-1121 Toll-freeRio Rancho, NM 87174 Rio Rancho, NM 87124 (505) 892-6243 FaxUSA USA Web: E-mail:www.lectrosonics.com sales@lectrosonics.com

Multi-Frequency IFB TransmitterRio Rancho, NM 15

November 8, 2006581 Laser Road NE • Rio Rancho, NM 87124 USA • www.lectrosonics.com(505) 892-4501 • (800) 821-1121 • fax (505) 892-6243 • sales@lectrosonics.comLIMITED ONE YEAR WARRANTYThe 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. It 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 POSSIBILITY 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.