DD4PA770Antenna Combiner

PA Series Wireless Antenna Combiner User Guide Guide de l’utilisateur du répartiteur d’antenne sans fil Bedienungsanleitung für die drahtlose Antennenweiche Guía del usuario del combinador de antenas inalámbrico Guida d’uso del combinatore di antenne senza fili Shure Brothers Incorporated 222 Hartrey Avenue Evanston IL 60202-3696 U.S.A. PSM
700 Wireless Personal Stereo Monitor System 27A8680 (SB) E1999, Shure Brothers Incorporated Printed in U.S.A. 1 English – TABLE OF CONTENTS Introduction2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Overview2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Appendix A. Specifications4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Appendix B. Rack Mounting Options5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FCC Statement. The P7R Receiver complies with part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device does not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Licensing Statement. A user license may be required for operation. Contact the communications authority in your country for more information. Modifications to Approved Equipment. Changes or modifications not expressly approved by Shure Brothers Incorporated could affect compliance with telecommunications standards, thereby voiding the user’s authority to operate this product. This symbol indicates that dangerous voltage constituting a risk of electric shock is present within this unit. This symbol indicates that there are important operating and maintenance instructions in the literature accompanying this unit. 2 English – INTRODUCTION Shure PA-Series UHF Antenna Combiners are designed to allow up to four PSM wireless transmitters to use a single antenna. The unit combines four PSM wireless transmitters to a single antenna, reducing stage clutter and improving intermodulation distortion performance. Features SUHF operation. SUp to four wireless transmitters can be combined into one transmitting antenna. SLow noise and intermodulation distortion. The PA Antenna Combiner maintains clean signals with minimal distortion. SMicrostrip technology for signal combining and filtering. SFour push/pull amplifiers for improved linear performance. SFront-mounted antenna. The PA Antenna Combiner comes with hardware to front-mount the antenna, which allows for better radio transmission. SDual rackmount hardware. The PA Antenna Combiner comes with hardware so that it can be rackmounted with another PA Antenna Combiner or PSM Transmitter into a single rack space. OVERVIEW Front Panel Ê ÊPower Switch and LED. The green LED illuminates when the power is on. Rear Panel Ê
 ÊPower Connector.
ANTENNA OUT Connector — 50 Ω, BNC. INPUT Connectors — 50 Ω, BNC. For connecting the unit to up to four wireless transmitters. 3 English – INSTALLATION Connection 1.Using the cables supplied with each PSM Transmitter, connect the ANTENNA OUT of each PSM Transmitter to the INPUTS of the PA Antenna Combiner. 2.Attach the antenna (one supplied with each PSM Transmitter), or an optional directional antenna such as the Shure Model PA705, to the ANTENNA OUT connector of the PA Antenna Combiner. 3.Run the supplied power cable from the power connector to a power supply. TO POWER SUPPLIES TO POWER SUPPLY TRANSMITTER 1 TRANSMITTER 2 TRANSMITTER 3 TRANSMITTER 4 4 English – APPENDIX A. SPECIFICATIONS UHF Carrier Frequency Range Model NumberFrequency Range PA760620 to 670 MHz PA765800 to 870 MHz PA770720 to 750 MHz System Gain 0 dB (+2 dB, –4 dB) Input/Output Port VSWR Less than 1.7:1 Output Port Isolation Greater than 23 dB Third Order Intercept Point (3 OIP) Greater than 25 dBm Input AC Line Voltage 100 to 240 Vac, 50/60 Hz (country dependent) NOTE: This product is not completely disconnected from the mains when the power switch is in OFF position. Maximum Input Current 0.5 Aac Maximum RF Input Power +20 dBm (100 mW) Impedance 50 Ω nominal Operating Temperature Range –7° C to +49° C Overall Dimensions 44.5 mm high x 197.4 mm wide x 225.6 mm deep (1.75 in. x 7.770 in. x 8.880 in.) Net Weight 1.34 Kg (2 lbs, 15.4 oz) Input/Output Connector Type BNC-type (4 input, 1 output) Certifications PA760, PA770: Type accepted under FCC Part 74. Certified by IC in Canada under RS 123. UL and cUL listed to UL813 and CSA 22.2 No. 1. PA760, PA765, PA770: Conforms to European Union Low Voltage Directive (73/23/EEC) and EMC Directive (89/336/EEC), eligible to bear CE marking. Meets Low Voltage Requirements: VDE GS-Certified to IEC 60065. Meets EMC Emission and Immunity Requirements: ETS 300 445. Furnished Accessories Rack Mount KitPA745. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 ft. Coaxial Cable (RG-58/U)UA802. . . . . . . . . . . . . . . . . . Optional Accessories Unidirectional Antenna (620–870 MHz)PA705. . . . . . . . . . 2 ft. Coaxial Cable (RG-58/U)UA802. . . . . . . . . . . . . . . . . . 10 ft. Coaxial Cable (RG-58/U) PA725. . . . . . . . . . . . . . . . 25 ft. Coaxial Cable (RG-8/X)UA825. . . . . . . . . . . . . . . . . . 50 ft. Coaxial Cable (RG-8/X)UA850. . . . . . . . . . . . . . . . . . Replacement Parts Bulkhead Adapters95A8647. . . . . . . . . . . . . . . . . . . . . . . . . 120 VAC Power Line Cord95A8389. . . . . . . . . . . . . . . . . . . 230 VAC Power Line Cord95A8247. . . . . . . . . . . . . . . . . .…

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June 24, 1999 Mr. George Tannahill FCC Application Processing Branch Re: FCC ID DD4PA770 Correspondence Reference Number: 8413 731 Confirmation Number: EA93903 Date of Original E-mail: 06/24/1999 Dear Mr. Tannahill, With respect to the questions you raised in your E-mail message of the above date: 1. The maximum input power to the combiner is +20 dBm (100 mW) per input, or +26 dBm (400 mW) total for all inputs. This is a conservative figure; the design will handle at least 20% more than these amounts. However, the combiner is intended only to be used with Shure LPAS model P7T transmitters, which can deliver a maximum of +20 dBm (100 mW) of power. The plots that you received were tested with Shure P7T transmitters as signal sources, operating at +20 dBm output. 2. The intermodulation data was gathered using four Shure P7T transmitters as drivers, each connected to one of the combiner inputs. The transmitters were all operating at their normal output power of +20 dBm (100 mW). This was done to replicate an "actual use" setup. Since the P7T transmitters have no user adjustment for the output power, the power level remained the same for all tests. Once again, if you have any further questions, please do not hesitate to contact me. Sincerely, Edgar C. Reihl, P.E. Principal Engineer Shure Brothers Incorporated Telephone: (847) 866-2289 E-mail: [email protected] MICROPHONES AND ELECTRONIC COMPONENTS Shure Brothers Incorporated 222 Hartrey Avenue Evanston, IL 60202-3696 • U.S.A.

System Block Diagram 4:1 Combiner Σ ΣΣ Σ Amplifier 1 Amplifier 2 Amplifier 3 Amplifier 4 Power Supply 100-240VAC in 12VDC out Input 1 Input 2 Input 3 Input 4 Low Pass Filter Output

PA770 REAR PANELVIEW

Description: PSM 700MHZ ANTENNA COMBINER DRWG. PA770-7 Refer To Drawing NOS. 90B8802-3, 90A8802-11 Page 1 of 5 ISSRecord of Changes Made 1.Production Release Exp Dwg. No: Used in: SHURE BROTHERS INC. 222 HARTREY AVENUE EVANSTON, IL 60202 PHONE 708-866-2200 Microphones-Electronic Components Typed: Mark Podraza Checked: Mark Podraza Approved: Kevin Mikes Approved: Shure Model PA770 PSM 800MHz Antenna Combiner Specification Project # 17127 Outline General Product Description I Special Features II Circuit Description III Test Equipment IV Alignment Procedure V Test for Product Acceptance VI Agency Approvals VII Additional Product Specifications VIII Mechanical Specification IX Environmental Specification X Service Evaluation XI Appendix A () General Product Description The Antenna Combiner allows up to four 700 MHz PSM transmitters to use a single antenna. The unit takes in four inputs from the transmitters and outputs them to a single antenna, eliminating stage clutter and improving intermodulation distortion performance. The unit is designed to meet the needs of users with multiple systems, and will generally be rack-mounted. I Special Features The Antenna Combiner features a microstrip Wilkinson power combiner, and four push-pull amplifiers for very linear performance. The unit has DC protection on all ports. The Combiner can be used from 100VAC to 240VAC. II Circuit Description RF Section Each input signal is first amplified by a temperature-compensated push- pull amplifier. The signals are then combined, using a microstrip 4 way Wilkinson combiner. They then pass through a low-pass filter to attenuate the harmonics above 1GHz, and are sent to the antenna port. Description: PSM 700MHZ ANTENNA COMBINER DRWG. PA770-7 Refer To Drawing NOS. 90B8802-3, 90A8802-11 Page 2 of 5 ISSRecord of Changes Made 1.Production Release Exp Dwg. No: Used in: SHURE BROTHERS INC. 222 HARTREY AVENUE EVANSTON, IL 60202 PHONE 708-866-2200 Microphones-Electronic Components Typed: Mark Podraza Checked: Mark Podraza Approved: Kevin Mikes Approved: Power Section The unit is powered by a switching power supply that takes AC line voltage from an IEC cord and delivers a regulated 12VDC to the amplifier circuitry. The combiner stages are passive, and do not require electrical power. The power supply has a 5V supply line as well that requires a minimum current draw of 400mA. There are six power resistors on the board that draw this minimum load. There are also four power resistors that draw a required minimum load 160mA from the 12V supply. <System Block Diagram> III Test Equipment Required Test Equipment (or approved equivalent) 1. Digital Multimeter Fluke 87 4:1 Combiner Σ ΣΣ Σ Amplifier 1 Amplifier 2 Amplifier 3 Amplifier 4 Power Supply 100-240VAC in 12VDC out Input 1 Input 2 Input 3 Input 4 Low Pass Filter Output Description: PSM 700MHZ ANTENNA COMBINER DRWG. PA770-7 Refer To Drawing NOS. 90B8802-3, 90A8802-11 Page 3 of 5 ISSRecord of Changes Made 1.Production Release Exp Dwg. No: Used in: SHURE BROTHERS INC. 222 HARTREY AVENUE EVANSTON, IL 60202 PHONE 708-866-2200 Microphones-Electronic Components Typed: Mark Podraza Checked: Mark Podraza Approved: Kevin Mikes Approved: 2. Spectrum Analyzer HP8590L with tracking generator IV Alignment Procedure The Antenna Combiner requires no tuning or calibration. V Test for Product Acceptance The power supply uses any AC voltage between 100V and 240V, and when operating properly should produce 12VDC ± 0.6VDC at TP+12VDC(TPT I2 on schematic), 5VDC ± 0.2VDC at TP+5VDC(TPT I172), and 10 VDC ± .5VDC at all TP+10VDC. To power the unit off DC, remove the 6-pin power cable connecting the power supply to the board. Apply 12VDC to I16(or TP+12VDC if switch SW2 is set to “ on” ),5VDC to TPT I172, and attach the ground at I3(any PC board ground). The above voltage readings should still hold. The current drains are given in the chart below. The powered-up PA770 can be tested by applying a +10dBm RF signal at BNC inputs 1-4, and measuring the RF strength at the antenna output. Input signals in the passband, 720-750 MHz, should give outputs of 10dBm, +2dBm, -4dBm. VI Agency Approvals 1.0 FCC Part 74 2.0 UL VII Additional Product Specifications Specification Minimum Typical Maximum Passband Frequency Range720 MHz 750 MHz Net Gain in Passband-4dB 0dB 2dB Port to Port Isolation @10dBm input23dB 26dB - Intermods @10dBm out- -45dBc -40dBc Description: PSM 700MHZ ANTENNA COMBINER DRWG. PA770-7 Refer To Drawing NOS. 90B8802-3, 90A8802-11 Page 4 of 5 ISSRecord of Changes Made 1.Production Release Exp Dwg. No: Used in: SHURE BROTHERS INC. 222 HARTREY AVENUE EVANSTON, IL 60202 PHONE 708-866-2200 Microphones-Electronic Components Typed: Mark Podraza Checked: Mark Podraza Approved: Kevin Mikes Approved: DC Current Drain off 12V line660mA 710mA 810mA DC Current Drain off 5V line355mA 390mA 425mA VIII Mechanical Specification 1. Overall Dimensions 1 3/4 IN (44.5 mm) High x 7.770 IN (197.4 mm) Wide x 8.880 IN (225.6 mm) Deep. Optional mounting ears for rack mounting. 2. Weight 2lbs. 15.4oz (1.34kg) 3. Housing Chassis: galvanized steel (Half-Rack) Cover: vinyl coated steel Front Panel: anodized aluminum 4. Antenna Antenna supplied with 700 MHz P7T. IX Environmental Specification Temperature Storage 7 days at +165F (+74C) degrees, packaged. 7 days at -20F (-29C) degrees, packaged. After each 7 day storage, the units must be allowed to stabilize for 24 hours before testing. Units must operate per the -7 specification. Temperature Cycling 5 cycles from -20F (-29C) degrees, to +165 (+74C) degrees, allow 24 hours for stabilization before testing. Units must operate the -7 specifications Mechanically and Electrically. Operational Temperature Operate units as described in the -7 at +45F (Modified) (+7C) and +100F (+38C) degrees. Allow three hours for stabilization of each temperature before testing. Units must operate per the -7 specifications. Steady State Humidity Perform a 7 day test at 90% RH at room temperature.…

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Description: PA770 PCB ASSEMBLY DRWG NO. 90-8802B-3 Refer To Drawing NOS. 90-8802-11 Page 1 of 2 ISS.Record of Changes Made 1.Production Release Exp Dwg. No: Used in: PA770 SHURE BROTHERS INC. 222 HARTREY AVENUE EVANSTON, IL 60202 PHONE 847-866-2200 Microphones-Electronic Components Typed: K. Mikes 3/1/99 Checked: K. Mikes 3/1/99 Approved: K. Mikes 3/1/99 Approved: ----------------------------------------------------------------------------------------- Shure P/N Qty Description Ref. Des. ----------------------------------------------------------------------------------------- 145AF49R9 5 49.9 1% R6-7 R11-12 R102 145BF1000 16 SMT Resistor 100 1% R20-27 R50 R55 R65 R70 R80 R85 R93 R98 145BF1501 8 SMT Resistor 1.50K 1% R49 R54 R64 R69 R79 R84 R92 R97 145BF3651 8 SMT Resistor 3.65K 1% R53 R58 R68 R74 R83 R88 R96 R101 145BF4992 5 SMT Resistor 49.9K 1% R30 R32 R63 R78 R91 145BF6041 1 SMT Resistor 6.04K 1% R9 145BF7500 8 SMT Resistor 750 1% R10 R13-19 145BF68R1 8 SMT Resistor 68.1 1% R51 R56 R66 R71 R81 R86 R94 R99 145DJ750 10 SMT Resistor 75 5% R1-5 R8 R28-29 R31 R33 150DB101JA 32 SMT Capacitor 100pF 5% 100V C1 C8-9 C13 C15 C20-21 C59 C61-62 C71 C73-74 C107 C109-110 C119-120 C122-123 C133 C135-136 C145 C147-148 C158 C160-161 C170 C172-173 150DB102JA 32 SMT Capacitor 1000pF 5% 100V C63 C65-67 C75 C77-79 C112 C114-116 C124 C126-128 C137 C139-141 C149 C151-153 C162 C164-166 C174 C176-178 150DB103KB 8 SMT Capacitor .01uF 10% 100V C60 C72 C108 C121 C134 C146 C159 C171 150DB120JA 8 SMT Capacitor 12pF 5% 100V C4-5 C10-11 C16-17 C22-23 150DB121JA 5 SMT Capacitor 120pF 5% 100V C14 C106 C111 C132 C157 150DB228BA 2 SMT Capacitor 2.2pF .1p F 100V C29-30 150DB338BA 8 SMT Capacitor 3.3pF .1p F 100V C2-3 C6-7 C12 C18-19 C80 150DB509BA 1 SMT Capacitor .5pF .1p F 100V C24 151AD106KB 8 SMT Capacitor 10uF 10% C64 C76 C113 C125 C138 C150 C163 C175 161A04 8 Balun Transformer L17-18 L30-31 L36-37 L42-43 162-10 7 INDUCTOR SURFACE MOUNT (0805) See Table L3 L4 L7-10 L14 L16 162D06 8 Surface Mount Inductor L13 L15 L26 L28 L32 L34 L38 L40 162K06 8 INDUCTOR SURFACE MOUNT .033uH L1-2 L5-6 L11-12 L19-20 Description: PA770 PCB ASSEMBLY DRWG NO. 90-8802B-3 Refer To Drawing NOS. 90-8802-11 Page 2 of 2 ISS.Record of Changes Made 1.Production Release Exp Dwg. No: Used in: PA770 SHURE BROTHERS INC. 222 HARTREY AVENUE EVANSTON, IL 60202 PHONE 847-866-2200 Microphones-Electronic Components Typed: K. Mikes 3/1/99 Checked: K. Mikes 3/1/99 Approved: K. Mikes 3/1/99 Approved: 162W10 1 INDUCTOR SURFACE MOUNT 8.2nH L21 183A01 8 Transistor Q5-6 Q9-14 184A02 8 Diode-Switching D8-15 188A253 8 NPN MEDIUM POWER Q1-2 Q4 Q7-8 Q15-17 MICROWAVE TRANSISTOR 55A8104 1 POWER SWITCH SW2 65B8148 1 Led Holder For 86B8419 D2 86C8419 1 Green LED D1 95A8363 1 Header, 6 pin J6 95A8631 5 BNC JACK - PCB MOUNT 50 ohm J1-2 J7-9 R0805 4 Dummy resistor See Table R200-203 90A8802 90B8802 R200145BF1000Do Not Place R201Do Not Place145BF1000 L3,4,7,8,9,10,14,16162V10162C10

EMC Test ServicesReport No. 7253 1250 Peterson Drive, Wheeling, Illinois 60090, USA06/28/01 Page 1 TEST SPECIFICATION: FCC "Rules and Regulations", Part 74, Experimental Radio, Auxiliary, Special Broadcast and Other Program Distribution Services for Operation in the 614 MHz to 806 MHz Band Subpart H, Low Power Auxiliary Stations Sections 74.801 to 74.882 THE FOLLOWING “MEETS” THE ABOVE TEST SPECIFICATION Formal Name:Antenna Combiner Kind of Equipment:Antenna Combiner Test Configuration:Four transmitters feeding combiner, antenna connected to combiner. Emission Designator: 196KF8E Transmitter FCC ID: DD4PA770 Model Number: PA770 Serial Number: NA Dates of Test:March 12 & 24, 1999 Test Conducted For: Shure Brothers Inc. 222 Hartrey Avenue Evanston, Illinois 60202 NOTICE:Please see change information listed inside of this report. This report must not be used by the customer to claim product endorsement by NVLAP or any agency of the United States Government, and it cannot be reproduced (except in full), without the approval of D.L.S. Electronic Systems Inc. EMC Test ServicesReport No. 7253 1250 Peterson Drive, Wheeling, Illinois 60090, USA06/28/01 Page 2 SIGNATURE PAGE Report Written By: Arnom C. Rowe Test Engineer EMC-001375-NE Report Reviewed by: Jack Prawica Lab Manager Report Approved by: Brian J. Mattson General Manager Company Official: Shure Brothers Inc. Page 3 Page 4 EMC Test ServicesReport No. 7253 1250 Peterson Drive, Wheeling, Illinois 60090, USA06/28/01 Page 5 1.Cover Pagei 2.Signature Pageii 3.NBS Certificate of Accreditationiii 5.Table of Contentsiv 7.Summary of Test Report1.0 7.Introduction2.0 7.Object3.0 7.Test Set-up4.0 8.Test Equipment (Bandwidths and Detector Function)5.0 8.RF Power Output6.0 9.Graphs taken of the RF Power Output Measurements6.0 13.Modulation Characteristics7.0 14.Graphs taken of the Modulation Characteristics7.0 15.Occupied Bandwidth8.0 16.Graphs taken of the Occupied Bandwidth8.0 20.Frequency Deviation9.0 21.Graphs taken of the Frequency Deviation9.0 22.Spurious Emission Measurements at Antenna Terminals10.0 23.Conducted Emission Data taken10.0 27.Conducted Emission Graphs Taken10.0 EMC Test ServicesReport No. 7253 1250 Peterson Drive, Wheeling, Illinois 60090, USA06/28/01 Page 6 30.Field Strength of Spurious Emission Measurements11.0 32.Radiated Data taken for Field Strength Measurements11.0 37.Radiated Graphs taken for Field Strength Measurements11.0 42.Frequency Stability (Temperature)12.0 43.Graphs taken of Frequency Stability (Temperature)12.0 44.Frequency Stability (Voltage Variation)13.0 45.Graphs taken of Frequency Stability13.0 46.Photo Information and Test Set-Up14.0 47.Photos Taken During Testing15.0 49.Change Information16.0 51.Results of Tests17.0 51.Conclusion18.0 52.Equipment ListTABLE 1 EMC Test ServicesReport No. 7253 1250 Peterson Drive, Wheeling, Illinois 60090, USA06/28/01 Page 7 1.0SUMMARY OF TEST REPORT It was found that the Antenna Combiner S/N NA “meets” the radio interference emission requirements of the FCC "Rules and Regulations", Part 74, Subpart H, Sections 74.801 to 74.882 for Low Power Auxiliary Stations operating in the 722 MHz to 746 MHz Frequency Band. 2.0INTRODUCTION On March 12 & 24, 1999, a series of radio frequency interference measurements were performed on Antenna Combiner (Transmitter), S/N NA. The tests were performed according to the procedures of FCC as stated in Part 2 Subpart J, Equipment Authorization Procedures of the Code of Federal Regulations 47, by personnel of D.L.S. Electronic Systems, Inc. who are responsible to Donald L. Sweeney, Senior EMC Engineer. 3.0OBJECT The purpose of this series of tests was to determine if the test sample could meet the radio frequency emission requirements of the FCC "Rules and Regulations", Part 74, Subpart H, Sections 74.801 to 74.882 for Low Power Auxiliary Stations operating in the 722 MHz to 746 MHz Frequency Band. 4.0TEST SET-UP All radiated emission tests were performed at D.L.S. Electronic Systems, Inc. The radiated tests were made with the test item placed on a wooden turntable located in the Test Room with the receive antenna placed one meter from the device under test. EMC Test ServicesReport No. 7253 1250 Peterson Drive, Wheeling, Illinois 60090, USA06/28/01 Page 8 5.0TEST EQUIPMENT (Bandwidths and Detector Function) All data was automatically plotted using peak detector function. This information was then used to determine the frequencies of maximum emissions. Manual measurements were performed on these frequencies using a peak detector function of the Analyzer with the bandwidths specified by the FCC. From 200 MHz to 1000 MHz a bandwidth of 100 kHz was used (except for Occupied Bandwidth), and above 1000 MHz, wide enough bandwidths were used, depending upon the test being made, to ensure proper measurement of the narrowband signal. A list of the equipment used can be found in Table 1. All equipment was calibrated per the instruction manuals supplied by the manufacturer. 6.0RF POWER OUTPUT - PART 2.985 As stated in PART 74.861 (e-1), the output power should not exceed 250 milliwatts (24 dBm). The Antenna Combiner was tuned according to the tune-up procedures specified in Part 2.983 (d-5), and adjusted for its maximum output power. The RF output power was measured in the open field, using the following test method: The radiated signal from the EUT was measured. The EUT was then substituted with a signal generator and a tuned dipole antenna. The output of the signal generator was increased until the level received by the tuned dipole equaled that of the previous measured from the EUT. Actual Measurements Taken: -3.3dBuV Measured output of the transmitter +20.8 dBuV Total system losses (Antenna, Pads & Cable) 17.50dBuV which equals 0.06 watts LIMIT: Manufacturer's rated output power = 0.1 watts Tolerance = NA MARGIN: 0.25 watts - 0.06 watts = 0.04 watts NOTE: See the following pages for the graphs of the actual measurements made: EMC Test ServicesReport No. 7253…

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June 17, 1999 Mr. George Tannahill FCC Application Processing Branch Re: FCC ID DD4PA770 Correspondence Reference Number: 8278 731 Confirmation Number: EA93903 Date of Original E-mail: 06/16/1999 Dear Mr. Tannahill, With respect to the questions you raised in your E-mail message of the above date: 1. The device for which approval is being sought is a transmitter combiner. It has four inputs and one output. Therefore, the device is capable of outputting a signal which is the combination of up to four signals. Normally, it would be expected that these signals would be on different frequencies. Intermodulation test data is being provided to you in conjunction with this letter. 2. The input and output bandwidth plots are virtually identical, since the combiner does not change the emission signature. The plots submitted are being annotated to attempt to show more clearly which plot applies to the input and which applies to the output. However, since the plots are so nearly identical, this may be difficult to distinguish. 3. The emission designator given was for a type of Part 74 Low Power Auxiliary Station transmitter, FCC ID DD4P7T, that is intended to be used with the combiner. That transmitter's Emission Designator, shown on its grant, is 196KF8E. This designator is appropriate for that device, since the transmitter uses the standard Zenith-GE time division multiplex method of stereophonic audio transmission. As you pointed out in your message, it would probably be appropriate to state "combiner" on the grant for device DD4PA770, rather than a specific emission designator. This was done on a previous device of the identical type, FCC ID DD4PA760, which operates in a different frequency range of 620-670 MHz. 4. Since the device is a combiner, the power output would normally be dependent upon the exact power of the input signal(s). The transmitters that the device is intended to be used with have a maximum power output of 0.1 Watts. The power output specification that you referred to is for an internal test procedure. The product gain specification is 0 dB, +2dB and -4 dB. This means that a single test signal of +10dBm at any of the inputs should produce an output falling within the range of +12 dBm and +6 dBm. This variation normally causes no operational difficulty for the user. As a reminder, this device is for use as a Low Power Auxiliary Station, and is not intended to be used for broadcasting directly to the public. MICROPHONES AND ELECTRONIC COMPONENTS Shure Brothers Incorporated 222 Hartrey Avenue Evanston, IL 60202-3696 • U.S.A. We recommend that the grant show a power output of 0.1 Watts, perhaps with a notation that this is with a single input driven. Again, this device is essentially identical to FCC ID DD4PA760, which has a power output of 0.1 Watts specified on the grant. The test laboratory also measured the spurious radiation which the device produces with no input signals, at 17.5 dB microvolts. This low radiation level is essentially due to the switching power supply, since the PA770 combiner has no internal signal source or clock signal. 5. Since the device is a combiner, which is a type of amplifier, no necessary bandwidth needs to be listed on the grant. Please see item #3, above. I trust that the above information will be helpful to you. If you have any further questions, please do not hesitate to contact me. Sincerely, Edgar C. Reihl, P.E. Principal Engineer Shure Brothers Incorporated Telephone: (847) 866-2289 E-mail: [email protected]