B5DM522AUDITORY ASSISTANCE TRANSMITTER

Preliminary Operating Instructions Telex Model ST-300 Auditory Assistance Transmitter Carefully unpack your Auditory Assistance Transmitter. If there is any damage or shortages, please refer to the “Warranty Service Information”. Set-up Instructions: Power: Power will be received from the supplied “wall cube”. Before applying power, it is suggested that all input cords be plugged in and the antenna be screwed onto the transmitter. Insert the cord plug into the transmitter before plugging in the wall cube. The wall cube normally supplied is for 120 V AC, 60 Hz use only. Transmitter Location : Select a suitable location for the transmitter. Try to keep a clear, unobstructed path between the transmitter and the receiver. The transmitter should not be located near metallic objects such as building structures and file cabinets. Locating the transmitter on top of a file cabinet is OK. Avoid high heat sources such as radiators . Antenna : The transmitter uses a special “reverse” RF connector on the model ST-300. This is intentional and is designed to comply with FCC Part 15 Rules. The antenna supplied should be the only antenna used with the ST-300. The antenna is designed to operate in the vertical position. Audio Input : One or both of the audio input connections can be used at the same time. A single modulation limiter serves both inputs. If either input is not used, that input should be “turned off”. Unbalanced devices should be plugged into the ¼ in. (quarter inch) Unbalanced Audio input jack located on the rear panel. Tip is “hot” and the barrel is ground. Balanced devices should be plugged into the Balanced Audio “XLR” jack located on the rear panel. Pin 1 is Common (or ground), Pin 2 is audio input, Pin 3 is audio input. See operating instructions for additional information. E.D.R. audio : The Telex ST-300 Transmitter is equipped with E.D.R., Enhanced Dynamic Range (companded) audio. This mode greatly improves the Audio Signal to Noise Ratio when the ST-400 is used with the Telex Model SR-400 receiver. The E.D.R. mode must be selected on the transmitter and receiver to be effective. Also, The E.D.R. Mode must be de-selected if the ST-300 is used with more economical receivers such as the Telex SR-50 receiver. See Operating Instructions for further information. Telex ST-300 Transmitter Page 2 Frequency/Channel Considerations: As with any radio device, interference can occur at any time. The frequencies offered are shared with other legitimate users. Check the frequency/channel with the matching receiver to see if any interference is present. If interference is present, choose a different channel. The severity of interference varies with location and distance to the interfering station. If the interference is weak on all channels, this is probably acceptable since your transmitter will cover the interference and is unlikely to interfere with other users. Multiple Channel Systems require other considerations but each channel should be checked as above. For best results, locate each transmitter in the area it is to service, and as far apart as possible. Transmitter Operation: Turn the Monitor control down (counter-clockwise). Now that you have checked all of the channels you intend to use, apply power to the transmitter by pressing the Power Button located on the front panel. The Display Screen should now be on. Select the RF Channel on the transmitter to match the receiver channel. Turn the program material on (tape recorder, PA, microphone etc.) Adjust the appropriate Audio Input Level control until loud program material passages cause the Treble Clef Icon to just come on with loud input or set the step to the next dB level down. This allows sufficient “headroom” to prevent peak distortion on loud inputs. Set the High/Low power button to High position initially. See operating Instructions for additional information. Audio Monitor: After the audio input levels have been adjusted in the above procedure, stereo headphones with a ¼ in. plug can be plugged into the Monitor jack. If you wish to monitor the audio program material, turn up the monitor (volume) control to the desired level. The monitor control does not affect the transmitted audio level. System Walk Through: Now that the transmitter is set up, you should be able to hear the program material on the appropriate receiver. Walk the receiver through the area that it is intended to be used in. Check for any noise or interference that would cause undesired operation. Some of the causes of poor performance are listed below. Poor transmitter location. Poor receiver location. Interference. Local AC Line noise. RF “Trouble Spots.” Operating distance beyond system capability. Telex ST-300 Transmitter Page 3 Operating Instructions: When the Power button is pressed, the Channel, Frequency and existing audio settings are displayed. After 10 seconds (unless another button is pressed) the audio settings are blanked out. After this point, switch functions as follows: Operation Function/Result Press set Audio Settings are displayed. Press set Channel (“blinks”) flashes. Press up (arrow) Channel increments. Press down (arrow) Channel decrements. Press set flash stops, Channel is set in memory. Press set Unbalanced Audio Level flashes. Press up Audio Level increases at 6 dB per step. Press down Audio Level decreases at 6 dB per step. Press set flash stops, Level is set in memory. Press set Balanced Audio Level flashes. Press up Audio Level increases at 6 dB per step. Press down Audio Level decreases at 6 dB per step. Press set flash stops, Level is set in memory. Press set Mic (microphone input), 600 (600 Ohm Line) or 70V (70 V Line input) will flash, depending on which source was last selected. Press set again if the flashing source item is the desired item or Press up/down button to select new source. Press set last to save flashing item. Press set All items stop flashing. Ends “normal use” programming. Special Function Programming : E.D.R. : If E.D…

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Rev. 1/1/03 Telex Communications Inc. 8601 E. Cornhusker Highway Lincoln, NE 68507-9702 To: Federal Communications Commission Authorization and Evaluation Division Confidentiality Request regarding application for certification of FCC ID: B5DM522 Pursuant to Sections 0.457 and 0.459 of the Commission’s Rules, we hereby request confidential treatment of information accompanying this application as outlined below: Schematics Block diagram Operational description The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. The applicant understands that pursuant to Section 0.457 of the Rules, disclosure of this application and all accompanying documentation will not be made before the date of the Grant for this application. Sincerely, Charles E. Conner Project Engineer Telex Communications Inc.

TIMCO ENGINEERING INC. 849 NW State Road 45 Newberry, Florida 32669 http://www.timcoengr.com 888.472.2424 F 352.472.2030 email: [email protected] APPLICANT: TELEX COMMUNICATIONS INC. FCC ID: B5DM522 REPORT #: T\TELEX\919AUT4\919AUT4TestReport.doc COVER SHEET Test Report Product Name: AUDITORY ASSISTANCE TRANSMITTER FCC ID: B5DM522 Applicant: TELEX COMMUNICATION INC. 8601 E. CORNHUSKER HIGHWAY PO BOX 5579 LINCOLN, NEBRASKA 68505-5579 Date Receipt: JUNE 21, 2004 Date Tested: JUNE 30, 2004 TIMCO ENGINEERING INC. 849 NW State Road 45 Newberry, Florida 32669 http://www.timcoengr.com 888.472.2424 F 352.472.2030 email: [email protected] APPLICANT: TELEX COMMUNICATIONS INC. FCC ID: B5DM522 REPORT #: T\TELEX\919AUT4\919AUT4TestReport.doc TABLE OF CONTENTS APPLICANT: TELEX COMMUNICATIONS INC. FCC ID: B5DM522 TABLE OF CONTENTS TEST REPORT CONTAINING: PAGE 1.............TEST EQUIPMENT LIST PAGE 2.............TEST PROCEDURE PAGE 3.............RADIATION INTERFERENCE TEST DATA PAGE 4-6...........POWER LINE CONDUCTED INTERFERENCE PAGE 7.............OCCUPIED BANDWIDTH PAGE 8.............OCCUPIED BANDWIDTH PLOT EXHIBITS CONTAINING: REQUEST FOR CONFIDENTIALITY LETTER BLOCK DIAGRAM SCHEMATIC USERS MANUAL LABEL SAMPLE LABEL LOCATION EXTERNAL PHOTOGRAPHS INTERNAL PHOTOGRAPHS OPERATIONAL DESCRIPTION TEST SET UP PHOTOGRAPHS TIMCO ENGINEERING INC. 849 NW State Road 45 Newberry, Florida 32669 http://www.timcoengr.com 888.472.2424 F 352.472.2030 email: [email protected] APPLICANT: TELEX COMMUNICATIONS INC. FCC ID: B5DM522 REPORT #: T\TELEX\919AUT4\919AUT4TestReport.doc Page 1 of 8 EMC Equipment List Device Manufacturer Model Serial Number Cal/Char Date Due Date 3/10-Meter OATS TEI N/A N/A Listed 3/27/04 3/26/07 3-Meter OATS TEI N/A N/A Listed 1/13/03 1/12/06 Biconnical Antenna Eaton 94455-1 1057 CAL 3/18/03 3/18/05 Biconnical Antenna Eaton 94455-1 1096 CAL 10/1/01 10/1/03 Biconnical Antenna Electro- Metrics BIA-25 1171 CAL 4/26/01 4/26/03 Blue Tower Quasi-Peak Adapter HP 85650A 2811A01279 CAL 4/15/03 4/15/05 Blue Tower RF Preselector HP 85685A 2620A00294 CAL 4/27/04 4/27/06 Blue Tower Spectrum Analyzer HP 8568B 2928A04729 2848A18049 CAL 4/15/03 4/15/05 LISN Electro- Metrics ANS-25/2 2604 CAL 10/9/01 10/9/03 LISN Electro- Metrics EM-7820 2682 CAL 3/12/03 3/12/05 Log- Periodic Antenna Eaton 96005 1243 CAL 5/8/03 5/8/05 TIMCO ENGINEERING INC. 849 NW State Road 45 Newberry, Florida 32669 http://www.timcoengr.com 888.472.2424 F 352.472.2030 email: [email protected] APPLICANT: TELEX COMMUNICATIONS INC. FCC ID: B5DM522 REPORT #: T\TELEX\919AUT4\919AUT4TestReport.doc Page 2 of 8 TEST PROCEDURES GENERAL: This report shall NOT be reproduced except in full without the written approval of TIMCO ENGINEERING, INC. RADIATION INTERFERENCE: The test procedure used was ANSI STANDARD C63.4-1992 using a HEWLETT PACKARD spectrum analyzer with a pre-selector. In the frequency range 10 kHz to 30 MHz the RBW was 10 kHz and from 30-1000 MHz the RBW of the spectrum analyzer was 100 kHz with an appropriate sweep speed. The analyzer was calibrated in dB above a microvolt at the output of the antenna. The resolution bandwidth was 100 kHz and the video bandwidth was 300 kHz. The ambient temperature of the UUT was &tempr& with a humidity of &humr&. FORMULA OF CONVERSION FACTORS: The Field Strength at 3m was established by adding the meter reading of the spectrum analyzer (which is set to read in units of dBuV) to the antenna correction factor supplied by the antenna manufacturer. The antenna correction factors are stated in terms of dB. The gain of the Preselector was accounted for in the Spectrum Analyzer Meter Reading. Example: Freq (MHz) METER READING + ACF = FS 33 20 dBuV + 10.36 dB = 30.36 dBuV/m @ 3m ANSI C63.4-1992 Section 8.2.1 MEASUREMENT PROCEDURES: The EUT was placed on a non-conducting table 80 cm above the ground plane with the EUT located in the center of the table. With the antenna vertical a preliminary scan was done at 1 meters distance, the EUT was moved to a 3.0-meter distance and the antenna height varied and also placed in a horizontal position. The frequency was scanned from 9.0 kHz to 1.0 GHz. When an emission was found, the table was rotated to produce the maximum signal strength. The EUT was measured in three (3) orthogonal planes. The unit was measured at TIMCO ENGINEERING, INC. located at 849 N.W. State Road 45 Newberry, Florida 32669. TIMCO ENGINEERING INC. 849 NW State Road 45 Newberry, Florida 32669 http://www.timcoengr.com 888.472.2424 F 352.472.2030 email: [email protected] APPLICANT: TELEX COMMUNICATIONS INC. FCC ID: B5DM522 REPORT #: T\TELEX\919AUT4\919AUT4TestReport.doc Page 3 of 8 APPLICANT: TELEX COMMUNICATIONS INC. FCC ID: B5DM522 NAME OF TEST: RADIATION INTERFERENCE RULES PART NO. 15.237 REQUIREMENTS: CARRIER FREQUENCY WILL NOT EXCEEDS 98.0 dBuV/m AT 3M. OUT- OF-BAND EMISSIONS, OTHER THAN EMISSIONS IN THE RESTRICTED BAND SHALL NOT EXCEED 63.5 dBuV/m AT 3M. TEST DATA: Emission Frequency MHz Meter Reading dBuV Ant. Polarity Coax Loss dB Correction Factor dB Field Strength dBuV/m Margin dB 72.50 39.3 H 0.80 6.35 46.45 51.55 72.50 48.9 V 0.80 5.95 55.65 42.35 580.00 10.4 H 3.74 19.50 33.64 29.86 580.00 12.5 V 3.74 19.20 35.44 28.06 74.70 35.8 H 0.80 6.92 43.52 54.48 74.70 46.7 V 0.80 6.61 54.11 43.89 448.20 7.3 H 3.34 18.86 29.50 64.00 448.20 6.1 V 3.30 18.16 27.55 35.95 522.90 10.2 H 3.57 18.87 32.64 30.86 522.90 11.1 V 3.57 18.34 33.01 30.49 597.60 9.7 H 3.79 19.70 33.19 30.31 597.60 10.8 V 3.79 19.00 33.59 29.41 75.50 35.1 H 0.80 7.16 43.06 54.94 75.50 46.6 V 0.80 6.84 54.24 43.76 453.00 11.2 V 3.37 18.05 32.62 30.88 453.00 16.6 H 3.37 18.63 38.60 24.90 528.00 10.0 H 3.58 18.82 32.40 31.10 528.00 10.7 V 3.58 18.24 32.52 30.98 SAMPLE CALCULATION: FSdBuV/m = MR(dBuV) + ACFdB. TEST PROCEDURE: The procedure used was ANSI C63.4-1992 Section 8.2. The frequency was scanned from 9.0 kHz to 1.0 GHz. When an emission was found, the table was rotated to produce the maximum signal strength. The EUT was measured in thre…

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