B5DM514UHF FM Transceiver

Telex Model BTR-800 Base Station Owners/Users Manual (Preliminary Information) General Description The Telex Model BTR-800 is a part of the RadioCom ™ wireless intercom series providing all of the Base Station functions. The BTR-800 Base Station is a four channel receive and a two channel transmit unit operating within the 518-608 and 614-746 MHz range (TV Channels 22 to 59). Each base transmitter operates on selected frequencies in the lower half of the frequency range and the receivers operate on selected frequencies in the upper half of the frequency range. The primary transmit frequency is used to transmit voice signals to all four of the TR-800 portable (beltworn) units. The secondary transmit frequency is used either as a second independent voice or signaling frequency. Each transmitter is a full power unit (not a sub-carrier) that is fed to a power combiner in order to reduce the number of antennas required for transmit. Each of the base station receive frequencies are used to receive transmissions from each portable unit. Full Duplex (telephone type) operation is used and any portable can talk to any other portable or, any or all of the base receivers can be deselected allowing the mobiles to monitor only. Independent receive channels can be enabled or disabled by front panel Pushbuttons. The presence or absence of a portable transmit is displayed on the LCD Display. Two independent 2 wire or 4 wire intercom units can be connected to the base station. Each intercom has independent input and output level adjustments. An Auxiliary connector is provided for general audio use and also has input and output level controls. A local headset connector is provided with volume, audio channel A/B or both, microphone gain control and a talk switch. A front panel readout on the base station indicates the frequency or channel that is in current use. A separate menu is used to select one of several BTR-800 Users Manual Page 2 pre-programmed frequency sets or each base can be programmed to special frequencies by the user. The BTR-800 has a built-in 100 to 240 VAC 50/60 Hz power supply. Power is controlled by the ON/OFF front panel switch. Half (1/2) Wave antennas are supplied with the base station. These antennas are ground independent. For improved range distance), Log Periodic Antennas and various lengths of coaxial cable with connectors are available as accessories. Transmit (RF) power is switchable on the rear panel from 100mW (maximum) to 10 mW (minimum). The transmit power can also be turned off for use in multi systems where only one set of master transmitters is desired. The low power setting can be useful where multi-system intermod could occur or when it is desired to reduce the base transmitter range. An Intercom (I/C) termination switch on the rear panel allows selecting Telex, RTS or ClearCom connections. Both Intercom A and B have XLR and RJ Connectors on the rear panel in order to “Loop-Thru” to inter-connect several bases together. The Auxilliary Audio Input and Output connectors are “one way” ports that are useful for stand-alone applications. The Stage Announce is an Audio Output useful for any announce or page application . There is a dry “Relay Contact” (N.O.) also available on the rear panel for switching applications when stage announce is activated. END BTR-800 Users Manual Page 3 Specifications: Input Power...........................................100-240 VAC, 50-60 Hz. Transmitter: Frequency Range.......................518-608 and 614-746 MHz. ( within 3 TV Channels, 18 MHz blocks) RF Channels, two, frequency agile, 25 KHz steps. RF Power Output........................100 mW Nominal, Switchable down to 10 mW Nominal. Frequency Deviation....................40 KHz Peak. Audio Frequency Response...........200 Hz to 10 KHz Nominal. Microphone Input Level.................7.75 mV for 40 KHz Deviation. Receiver: Frequency Range.........................518-608 and 614-746 MHz. (within 3 TV Channels, 18 MHz Blocks) RF Channels, four, frequency agile, 25 KHz steps. Sensitivity............................ 0.8 uV for 12 dB SINAD Squelch (internal)........................Open at 20 dB SINAD. Modulation Acceptance..................40 KHz Nominal. Audio Frequency Response..............200 Hz to 10 KHz Nominal. Audio Output (local headset)..............200 mW, 600 Ohm Load. BTR-800 Users Manual Page 4 Intercom: Two independent intercoms are available (A and B). Each intercom has XLR Loop-Thru or 4 Wire “RJ” connectors. The user can select either 2 wire or 4 wire (but not both) from the front panel. The input and output levels are independently adjustable from the front panel. An Auxiliary intercom with XLR Connectors and input/output controls is also available. Local Headset: A 4 wire XLR connector is located on the front panel with Headset Volume, Microphone Gain Control, A/B or both Audio Channel Switch and Press to Talk or Lock to Talk switch. Wireless Talk Around: Provisions are made for “talk around mode”. Any portable station can select Talk Around mode and talk only to other portables but can still listen to the normal audio feed from the base station. Stage Announce: Any portable selecting Stage Announce can talk only to the Stage Announce function but can still listen to the normal audio feed. The stage announce relay contacts are closed when any portable selects stage announce.

518-572 MHZ 518-572 MHZ COMBINER PREEMPLPFPLLVCOLPFOUTPUTCOMPANDLIMITERMIX AUDIO INPUTS INPUTS AUDIO MIXLIMITERCOMPANDOUTPUTLPFVCOPLLLPFPREEMP CHANNEL A CHANNEL B BTR-800 BLOCK DIAGRAM BTR-800 ACTIVE DEVICES DES PART NO. FUNCTION 1. Q801 VP0610 SWITCH 2. Q802 BFG540X AMPLIFIER 3. Q803 BFG540X AMPLIFIER 4. Q804 MMBT3906 CURRENT SOURCE 5. Q805 MMUN2112 SWITCH 6. Q806 MMUN2212 SWITCH 7. Q807 BFG540X AMPLIFIER 8. Q808 MMBT3906 CURRENT SOURCE 9. Q809 BFG540X AMPLIFIER 10. Q810 VP0610 SWITCH 11. Q811 BFG540X AMPLIFIER 12. Q812 BFG540X AMPLIFIER 13. Q813 MMBT3906 CURRENT SOURCE 14. Q814 MMUN2112 SWITCH 15. Q815 MMUN2212 SWITCH 16. Q816 BFG540X AMPLIFIER 17. Q817 MMBT3906 CURRENT SOURCE 18. Q818 BFG540X AMPLIFIER 19. U801 TC55RP500 REGULATOR 20. U802 TRF2050 SYNTHESIZER 21. U803 TRF2050 SYNTHESIZER 22. U1001 MHW7152 AMPLIFIER 23. U1002 MHW7152 AMPLIFIER

BTR-800 Operational Description A. General This product contains two identical transmitters operating simultaneously on different frequencies and modulated by two different audio signals. The carriers are combined to feed a single antenna. In the following text the A channel will be described and the corresponding B channel component designator will be in parentheses. B. Mixer Audio from various inputs arrive at the transmit mixer U22A (U44A) where they are summed into one signal. C. Modulation Limiter U23A (U45A) is configured as a variable gain amplifier and U24 (U46) is configured as a window detector. When the audio fed into U24 (U46) exceeds the preset threshold, U24A (U46A) pulls low on negative peaks and U24B (U46B) pulls low on positive peaks. This discharges C48 (C118) and reduces the gain of U23A (U45A) until the input to U24 (U46) is just at the threshold of limiting. D. Compressor U23C (U45C) is a linear compressor that is used to improve the system signal to noise ratio. A complementary expander is used at the receiver. E. Pre-emphasis U23B (U45B) provides pre-emphasis which begins at 100 microseconds and ends at 15 microseconds. The output of U23B (U45B) feeds the modulation limiter. F. Low Pass Filter U23D (U45D) is a 3 pole low pass filter with a cutoff frequency of 10 kHz. G. PLL HY801 (HY802) is a VCO operating on the output frequency. U802 (U803) is a phase locked loop that controls HY801 (HY802). U802 and U803 are serially loaded with frequency data by U9??. The modulating signal is fed into the loop via VR801 (VR802), which is used to set the frequency deviation. H. Output Amplifiers Q802, Q803, Q807 and Q809 (Q811, Q812, Q816 and Q818) amplify the signal from HY801 (HY802) and provide reverse isolation. Q806 (Q815) is used to turn these stages on only after the loop has achieved lock. C831, C832, C833, L809 and L810 (C865, C866, C867, L819 and L820) provide impedance matching and harmonic suppression. I. Combiner U1001 and U1002 amplify and isolate the two carriers which are then combined by T1001. The combiner is kept off until both PLL’s achieve lock. Additional harmonic suppression is provided by C1006, C1007 and L1001. BTR-800 Receiver, Operational Description. Preliminary Information 12-13-00 Rev PB The BTR-800 Receiver is a component of the BTR800 Transmitter/ Receiver combination. The receiver is used to receive transmissions From four TR-800 Portables associated with the system. Frequency range for the system is 518-608 and 614-746 MHz. Selected bands, 18 MHz wide, within the above range are used to form Base Transmit and Base Receive frequencies for four full duplex systems. Signals from the antenna system are routed to connector J1. The receiver front end consists of 3 pre-tuned ceramic resonators (Z301,302 and 303) to provide selectivity against out of band interference to RF Amplifier U301. Selectivity following U301 is provided by Z304 and Z305. The signal then flows to the 1 st mixer U303. Also flowing to the mixer is the LO signal. Transistor Q301 Along with Crystal Y1 oscillates at 1/6 th of the LO frequency and The Q301 signal is fed to Q302 through C48. Q302 operates as a Frequency tripler and the 3 rd harmonic of Y1 is tuned by VC306, L305, L306 and VC307 combination. The third harmonic is then routed to Q303 where the frequency is doubled. The LO signal is then tuned byVC308, L307, VC306 and L308 combination. The 1 st LO signal then flows through C317 to the mixer IC U303. The RF and LO signals are mixed in U303 and are converted to IF signals Within a 65 to 83 MHz IF range. The IF signals are then routed to the 1 st IF broadband pre-amplifier Q304. T301 and the combination of L309, 310 and 311 form a broadband filter ahead of Q304. The IF signals are then fed to splitter transformer T302, T303 and T304 Where the IF signals are split four ways and are routed to individual IF strips where each signal is filtered out and processed into audio. BTR-800 Operational Description Page 2 The entire front end assembly can be considered a down converter and Is used to set the band of frequencies received but not individual frequencies. The frequency of the LO is determined by adding 83 MHz to the high end of the desired 18 MHz wide band. (high side injection). Example: Desired band is 482 to 500 MHz. 500 + 83 =583 MHz=LO. Y301 then = LO/6 = 583/6 = 97.16666 MHz. Individual frequencies will be determined later. For this paper, only one IF strip will be described. The remaining three operate the same except for the 1 st IF frequency, which is variable. IF signals enter the IF strip through C401 and are filtered by the combination of L403, 404 and C407/408 befor entering 1 st IF amplifier U401. The signals are amplified by U401 and applied to another filter combination L409, 410 and C422/423. These filter combinations are switched to one of four IF bands, depending on the IF frequency chosen. This 1 st IF signal is then fed to the 2 nd mixer U403 where it is mixed with the 2 nd LO. The 2 nd LO is generated by Q403 which is phase locked to the reference oscillator. U402 is the PLL circuit. The LO signal is buffered by Q404 and flows to the 2 nd mixer through C453 and C462. The 2 nd LO and the 2 nd IF are then mixed in U403 to form the 2 nd IF signal on 10.7 MHz. The second LO signal is always 10.7 MHz above the 1 st IF. The 10.7 MHz signal then flows through T401, FL401, Q405, FL402, Q408, U404A and FL403 to the Limiter/Detector IC U404B. The filtered and amplified signal is then limited by U404B, then detected as an FM signal by a quadrature detector tuned by L418. The audio signal appears at U404B-6 and flows through amplifier U405 and gate U406. Squelch signals appear at U404B-7 and are fed through Q406 to Q407 where amplified noise is frequency selected by C485/L419 combination. The noise is rectified by D412 and is applied to squelch comparator U407 and the internal squelch level is set by VR401. The U407 squelch signal then controls the audio output throu…

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Bill of Materials 770639PF.S02 BTR-800 PARTS LIST MAIN AUDIO Quan Type Value Ref Designators PATTERN ==================================================================== ==== 7 1DA LM833 U1,U25,U28,U35,U36,U37, BE-SO8 U40 3 1DA LM833 U19,U29,U38 BE-SO8 7 1DA LM393 U24,U3,U31,U33,U42,U46, BE-SO8 U6 1 1DA LM358 U47 2 2951 LP2951 U1103,U1104 BE-SO8 1 2951_SPECIAL 25LC640 U1115 BE-SO8 1 34119N MC34119 U5 BE-SO8 1 3DA LM833 U1 BE-SO8 2 4053 VAL U39,U4 BE-SO16 6 4053A 4053 U11,U12,U13,U14,U15,U26 BE-SO16 2 4053A 4053 U16,U2 BE-SO16 1 4053A 4053 U17 BE-SO16 1 4053A 4053 U39 BE-SO16 1 4053A 4053 U4 BE-SO16 1 4066 4066 U49 15-Jan-01 10:53 Page 1 Bill of Materials 770639PF.S02 BTR-800 PARTS LIST Quan Type Value Ref Designators PATTERN ==================================================================== ==== BE-SO14 11 4DA LM833 U18,U20,U21,U22,U27,U30, BE-SO8 U32,U34,U41,U43,U44 6 4DA LM833 U25,U28,U35,U36,U37,U40 BE-SO8 1 556 LM556 U7 BE-SO14 2 575EC SA575 U23,U45 BE-SSOP20 2 575EE SA575 U10,U9 BE-SSOP20 2 78L LM340S-5.0 U48,U8 29 AR VAL U50,U51,U52,U53,U54,U55, U56,U57,U58,U59,U60, U61, U62,U63,U64,U65,U66, U67, U68,U69,U70,U71,U72, U73, U74,U75,U76,U77,U78 27 C 10PF C10,C103,C110,C111,C112, BE-0603 C114,C117,C120,C38,C39, C42,C43,C44,C45,C48, C49, C50,C64,C66,C71,C74, C79, C80,C84,C85,C88,C89 4 C .022UF C104,C129,C59,C75 BE-0603 2 C 390PF C105,C76 BE-0603 2 C .0047UF C106,C77 BE-0603 2 C .0015UF C107,C78 BE-0603 15-Jan-01 10:53 Page 2 Bill of Materials 770639PF.S02 BTR-800 PARTS LIST Quan Type Value Ref Designators PATTERN ==================================================================== ==== 1 C 22PF C1148 1 C .1UF C1149 BE-0603 2 C 22PF C124,C54 BE-0603 2 C 1500PF C130,C60 BE-0603 5 C .01UF C131,C132,C19,C61,C62 BE-0603 4 C .001UF C133,C17,C20,C63 BE-0603 8 C 100PF C140,C141,C142,C15,C4, BE-0603 C8,C93,C98 2 C 56PF C94,C99 BE-0603 20 CAP .01UF C1101,C1102,C1103,C1104, BE-0603 C1105,C1106,C1108,C1109, C1110,C1111,C1112,C1 113, C1115,C1116,C1119,C1 127, C1130,C1131,C1132,C1 140 2 CAP 22PF C1117,C1118 BE-0603 6 CAP 0.1UF C1120,C1122,C1124,C1133, BE-0603 C1135,C1137 2 CAP .047UF C1121,C1134 BE-0603 4 CAP .47UF C1128,C1129,C1141,C1142 BE-1206 15-Jan-01 10:53 Page 3 Bill of Materials 770639PF.S02 BTR-800 PARTS LIST Quan Type Value Ref Designators PATTERN ==================================================================== ==== 2 CAP 22 PF C1143,C1144 BE-0603 6 CAP .01 C1151,C1152,C1153,C1154, BE-0603 C1155,C1156 20 CE 10UF C1,C1107,C1114,C1123, BE-ST-A C1125,C1136,C1138,C122, C126,C2,C23,C26,C3,C 33, C46,C47,C52,C56,C6,C 7 45 CE 1UF C100,C11,C1126,C113, BE-ST-A C1139,C1145,C1146,C115, C116,C121,C123,C125, C128,C13,C135,C136,C 137, C138,C139,C145,C146, C147,C148,C151,C152, C21, C24,C28,C31,C35,C40, C41, C51,C53,C55,C58,C65, C72, C73,C81,C86,C87,C9,C 92, C97 2 CE 100UF C101,C95 RB.1/.27 2 CE 22UF C102,C96 RB.1/.27 2 CE .1UF C108,C109 7 CE 10UF C118,C119,C144,C67,C68, BE-ST-B C90,C91 9 CE .1UF C12,C27,C30,C34,C37,C69, BE-ST-A C70,C82,C83 8 CE 2.2UF C127,C14,C25,C29,C32, BE-ST-A C36,C5,C57 3 CE 470UF C134,C16,C22 RB.200X.420 15-Jan-01 10:53 Page 4 Bill of Materials 770639PF.S02 BTR-800 PARTS LIST Quan Type Value Ref Designators PATTERN ==================================================================== ==== 3 CE 1UF C143,C149,C150 1 CE 100UF C18 BE-AE8 1 CRYSTAL 4MHZ Y1101 XTAL-HC-18/USID 1 CRYSTAL 24.576MHZ Y1102 XTAL-HC-18/USID 1 CV 5-20PF VC1101 BE-VC-MURATA 1 D TMPD4148 D1 BE-SOT23 1 D TMBD4148 D11 BE-SOT23 1 D SK34 D2 BE-SMC 2 D DL4004 D7,D8 BE-MLL41 1 DD2 BAV99 D9 BE-SOT23 1 DD56 BAW56 D10 BE-SOT23 2 DD70 BAV70 D5,D6 BE-SOT23 1 DZ 5.1V D1101 BE-SOT23 1 DZ BZX84C5V1 D3 BE-SOT23 1 DZ MMBZ5240 D4 15-Jan-01 10:53 Page 5 Bill of Materials 770639PF.S02 BTR-800 PARTS LIST Quan Type Value Ref Designators PATTERN ==================================================================== ==== BE-SOT23 2 E VAL E1,E2 2 E VAL E1101,E1107 PAD050 40 FB VAL FB1,FB10,FB11,FB12,FB13, BE-0805 FB14,FB15,FB16,FB17, FB18,FB19,FB2,FB20,F B21, FB22,FB23,FB24,FB25, FB26,FB27,FB28,FB29, FB3, FB30,FB31,FB32,FB33, FB34,FB35,FB36,FB37, FB38,FB39,FB4,FB40,F B5, FB6,FB7,FB8,FB9 1 JH J10-2 J10 JACK-RJ11 1 JH J5-2 J5 JACK-RJ11 1 JMPR VAL JM1101 BE-0603 3 JX3F VAL J3,J6,J8 XLR-NC3FAH-FEMA 4 JX3M VAL J2,J4,J7,J9 XLR-NC3MAH-MALE 1 KDD VAL K2 RELAY-G5V-2 1 KSD VAL K1 RELAY-G5V-2 2 LA 100UH L1,L2 BE-IND-5022 3 M4-32/32-10JC U1110,U1111,U1112 15-Jan-01 10:53 Page 6 Bill of Materials 770639PF.S02 BTR-800 PARTS LIST Quan Type Value Ref Designators PATTERN ==================================================================== ==== 44-PIN-PLCC 2 MOLEX14M VAL J1105,J1106 MOLEX14 1 MOLEX20W VAL J1102 MOLEX20 1 MOLEX5W VAL J1113 MOLEX5 1 MOLEX8W VAL J1108 MOLEX8 1 NC7S32A NC7S32 U1113 1 P J1-1 J1 MOLEX4 2 P VAL J11,J12 PAD100 1 P VAL J1114 BSW107S 1 P J13 J13 JACK-6401051 1 P VAL J14 CONN-WIELAND 1 P J15 J15 MOLEX2 1 P VAL P1114 7 P VAL P13,P14,P16,P22,P23,P24, MOLEX5 P25 1 P VAL P15 15-Jan-01 10:53 Page 7 Bill of Materials 770639PF.S02 BTR-800 PARTS LIST Quan Type Value Ref Designators PATTERN ==================================================================== ==== 1 P P17 P17 MOLEX5 1 P VAL P18 MOLEX12 1 P P19 P19 PAD100 1 P VAL P20 MOLEX4 1 P VAL P21 MOLEX2 4 P VAL P26,P27,P28,P29 MOLEX3 1 P VAL P30 1 P P31 P31 PAD100 1 POT 20K VR1101 POT-PIHER 15 QNEBC MMBT3904 Q10,Q11,Q12,Q13,Q14,Q17, BE-SOT23 Q18,Q19,Q2,Q3,Q4,Q5,Q6, Q7,Q9 1 QNEBC MMBT3904 Q1101 1 QNT ZVN4106 Q16 BE-SOT23 1 QPEBC MMBT3906 Q1 BE-SOT23 1 QPT IRFR9024N Q15 BE-TO252AA 15-Jan-01 10:53 Page 8 Bill of Materials 770639PF.S02 BTR-800 PARTS LIST Quan Type Value Ref Designators PATTERN ==================================================================== ==== 1 QPT IRFR9024N Q8 BE-TO252 7 R 1K R1,R10,R1119,R1120, BE-0603 R1121,R1122,R242 98 R 10K R100,R101,R102,R103, BE-0603 R104,R107,R109,R1118, R113,R118,R120,R121, R123,R124,R136,R141, R143,R144,R154,R155, R156,R16,R162,R163,R 164, R166,R17,R18,R187,R1 9, R197,R199,R20,R200,R 201, R207,R209,R21,R210,R 214, R215,R22,R220,R221,R 222, …

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BTR-800 Tune Up Info 1. Remove top cover. Unplug A transmit coax from combiner and connect to frequency counter and deviation meter. 2. Connect audio source to pins 1 (ground) and 2 (hot) of the headset connector. Set the level to 15 mv at 1kHz. 3. Adjust mic gain control to maximum. 4. Actuate power switch. Press talk button once so that Talk/Overmod LED lights. 5. Adjust VR801 for +/- 40 kHz deviation. 6. Adjust VC901 for correct frequency. 7. Reinstall A transmit coax to combiner and unplug B transmit coax. Connect as in step 1. 8. Press channel button (next to talk button) once so that the B LED lights. 9. Adjust VR802 for +/- 40 kHz deviation. 10. Reinstall B transmit coax and replace cover.

FCC ID: B5DM514 MFA p0110005, d0130030 Date: March 26, 2001 Federal Communications Commission Via: Electronic Filing Attention: Authorization & Evaluation Division Applicant: Telex Communications, Inc. Equipment: BTR-800 FCC ID: B5DM514 FCC Rules: Radiofrequency Radiation Exposure Limits 47 CFR 1.1310 MPE - Mobiles Fixed Based Station x Gentlemen: On behalf of the Applicant, enclosed please find the CALCULATED Supplemental Test Data Report, the whole for Environmental Assessment (MPE) of the referenced equipment as shown. We trust the same is in order. Should you need any further information, kindly contact the writer who is authorized to act as agent. Sincerely yours, Morton Flom, P. Eng. enclosure(s) cc: Applicant MF/cvr FCC ID: B5DM514 MFA p0110005, d0130030 CALCULATED ENVIRONMENTAL ASSESSMENT for FIXED BASE STATION for FCC ID: FCC ID: B5DM514 Model:BTR-800 to FEDERAL COMMUNICATIONS COMMISSION 47 CFR 1.1310 (MPE) Radiofrequency Radiation Exposure Limits DATE OF REPORT: March 26, 2001 ON THE BEHALF OF THE APPLICANT: Telex Communications, Inc. AT THE REQUEST OF: P.O. 219090 Telex Communications, Inc. 8601 E. Cornhusker Highway P.O. Box 5579 Lincoln, NE 68505-5579 Attention of: Charles E. Conner, Project Engineer (402) 467-5321; FAX: -3279 E-mail: [email protected] SUPERVISED BY: Morton Flom, P. Eng. FCC ID: B5DM514 MFA p0110005, d0130030 TABLE OF CONTENTS RULEDESCRIPTIONPAGE . Test Report 1 . Identification of the Equipment Under Test 2 . Standard Test Conditions and Engineering Practices 4 1.1310 Environmental Assessment 5 FCC ID: B5DM514 MFA p0110005, d0130030 PAGE NO.1of5. Required information per ISO/IEC Guide 25-1990, paragraph 13.2: a) TEST REPORT (SUPPLEMENTAL) b) Laboratory: (FCC: 31040/SIT) (Canada: IC 2044) M. Flom Associates, Inc. 3356 N. San Marcos Place, Suite 107 Chandler, AZ 85225 c) Report Number: d0130030 d) Client: Telex Communications, Inc. 8601 E. Cornhusker Highway P.O. Box 5579 Lincoln, NE 68505-5579 e) Identification: BTR-800 FCC ID: B5DM514 Description: UHF FM Transceiver f) EUT Condition: Not required unless specified in individual tests. g) Report Date: March 26, 2001 EUT Received: January 9, 2001 h, j, k): As indicated in individual tests. i) Sampling method: No sampling procedure used. l) Uncertainty: In accordance with MFA internal quality manual. m) Supervised by: Morton Flom, P. Eng. n) Results: The results presented in this report relate only to the item tested. o) Reproduction: This report must not be reproduced, except in full, without written permission from this laboratory. FCC ID: B5DM514 MFA p0110005, d0130030 PAGE NO.2of5. IDENTIFICATION OF THE EQUIPMENT UNDER TEST (EUT) NAME AND ADDRESS OF APPLICANT: Telex Communications, Inc. 8601 E. Cornhusker Highway P.O. Box 5579 Lincoln, NE 68505-5579 MANUFACTURER: Telex Communications, Inc. FCC ID: B5DM514 MODEL NO: BTR-800 DESCRIPTION: UHF FM Transceiver TYPE OF EMISSION: 20K0F3E FREQUENCY RANGE, MHz: 518 to 608 POWER RATING, Watts: 0.100 Switchable Variable x N/A MODULATION: AMPS TDMA CDMA x OTHER ANTENNA: HELICAL MONOPOLE WHIP x OTHER NOTE: For RF Safety test antenna gain taken at the upper range of expected gain (i.e. 0 dBd) and RF Power set to highest nominal power across all channels. FCC ID: B5DM514 MFA p0110005, d0130030 PAGE NO.3of5. M. Flom Associates, Inc. is accredited by the American Association for Laboratory Association (A2LA) as shown in the scope below. "This laboratory is accredited by the American Association for Laboratory Accreditation (A2LA) and the results shown in this report have been determined in accordance with the laboratory's terms of accreditation unless stated otherwise in the report." Should this report contain any data for tests for which we are not accredited, or which have been undertaken by a subcontractor that is not A2LA accredited, such data would not covered by this laboratory's A2LA accreditation. FCC ID: B5DM514 MFA p0110005, d0130030 PAGE NO.4of5. STANDARD TEST CONDITIONS and ENGINEERING PRACTICES Except as noted herein, the following conditions and procedures were observed during the testing: In accordance with ANSI C63.4-1992/2000, section 6.1.9, and unless otherwise indicated in the specific measurement results, the ambient temperature of the actual EUT was maintained within the range of 10°to 40°C (50°to 104°F) unless the particular equipment requirements specify testing over a different temperature range. Also, unless otherwise indicated, the humidity levels were in the range of 10% to 90% relative humidity. Prior to testing, the EUT was tuned up in accordance with the manufacturer's alignment procedures. All external gain controls were maintained at the position of maximum and/or optimum gain throughout the testing. Measurement results, unless otherwise noted, are worst case measurements. FCC ID: B5DM514 MFA p0110005, d0130030 PAGE NO.5of5. Name of test:R.F. Radiation Exposure - Calculation FCC Rules: 1.1307, 1.1310, 1.1311, 2.1091 Description, EUT: See page 2 of Test Report 0.3-1.234 MHz: Limit [mW/cm 2 ] = 100 1.34-30 MHz: Limit [mW/cm 2 ] = (180/f 2 ) 30-300 MHz: Limit [mW/cm 2 ] = 0.2 LIMITS: Uncontrolled Exposure 47 CFR 1.1310 Table 1, (B) 300-1500 MHz Limit [ mW/cm 2 ] = f/1500 1500-100,000 MHz: Limit [mW/cm 2 ] = 1.0 Limit: Uncontrolled Exposure 518/1500 = 0.3453 mW/cm 2 Theoretical Safe Distance f = 518 MHz P = 0.100 Watt Rm = [(TX Power)/(4πx Limit)] 1/2 = [0.1/(4πx 3.453)] 1/2 = 0.0480 meters = 4.8 cm = 1.89 inches SUPERVISED BY: Morton Flom, P. Eng. FCC ID: B5DM514 MFA p0110005, d0130030 TESTIMONIAL AND STATEMENT OF CERTIFICATION THIS IS TO CERTIFY THAT: 1. THAT the application was prepared either by, or under the direct supervision of, the undersigned. 2. THAT the technical data supplied with the application was taken under my direction and supervision. 3. THAT the data was obtained on representative units, randomly selected. 4. THAT, to the best of my knowledge and belief, the facts set forth in the application and accompanying technical d…

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TP159 TP160 TP140 TP122 S2 .001UF C133 TP121 U45:D SA575 19 18 17 .01UF C132 6.81K R235 .01UF C131 4.75K R234 S3:2 LM340S-5.0 U8 OUTIN GND LM340S-5.0 U48 OUTIN GND J13:4 100K R252 100K R251 TMBD4148 D11 MMBT3904 Q19 MMBT3904 Q18 100K R250 TP19 10K R249 P30:5 C144 10UF + C143 1UF + 100PF C142 100 R43 C18 100UF + TP152TP151TP150TP149 C19 .01UF LM556 U7:A 6 2 1 5 37 4 R R R RQ SQ 8.25K R41 1.5K R42 .001UF C20 TP16 C21 1UF + MMBZ5240 D4 TP17 470UF C22 + C137 1UF + 1K R242 C136 1UF + TP15 BAV99 D9 C135 1UF + P30:1 TP141TP142TP143TP144TP145TP146TP147TP148 P29:1 P28:1 P27:1 P26:1 P22:1 P23:1 P24:1 P25:1 P21:1 P16:5 P16:4 P16:3 P16:2 TP82 U39:A 4053 11 1312 687 1614 TP84 TP83 R15410K Q10 MMBT3904 100K R25 U2:B 4053 1 2 15 10 P13:5 P13:4 P13:3 P15:3 P15:5 P15:4 P14:5P14:4 P14:3 P14:2 P15:2 P13:2 R35 10K VR1 1K R34 8.25K C134 470UF + 100UH L1 TP18 BZX84C5V1 D3 330 R38 10K R36 R40 1.5K 6.81K R39 .001UF C17 6.81K R37 C16 470UF + L2 100UH D2 SK34 Q8 IRFR9024N U6:B LM393 7 8 5 6 U6:A LM393 1 3 2 4 LM556 U7:B 8 12 13 9 1014 11 R R R RQ SQ C35 1UF + C28 1UF + TP105 TP104 J10-5 J10-2 TP71 TP72 J5-2 J5-5 TP86 100K R161 C86 1UF + 100K R160 LM393 U33:A 4 2 3 1 LM393 U33:B 6 5 8 7 10K R120 TP68 TP44TP45TP46TP47 TP30TP31TP32TP33 TP23TP24TP25TP26 TP11 TP79 FB9 R91 100K J5-4 J5-3 TP70 TP69 J10-4 J10-3 TP116 TP115 TP59 TP67TP66 TP110 TP109 FB7 .1UF C82 .1UF C83 39.2K R150 39.2K R151 TP81 TP80 FB5 TP78 TP77TP76 TP75 TP74 TP91 FB13 TP89 FB15 FB14 R170 100K C91 10UF + TP90 TP88 TP85 TP107 TP108 TP103 TP102 TP92 TP73 TP111 TP113TP112 TP106 TP114 TP101 TP98 TP100TP99 TP95TP94 TP96 TP93 TP65 TP63 TP62 TP61 TP120 TP119 TP118 TP117 TP57 TP58 J14:1 FB10 R92 100K TP55 TP54 TP52 TP51 TP49 TP56 U17:C 4053 4 5 3 9 TP43 TP29 TP22 TP42 TP28 TP41 TP27 TP9 TP7 TP8 TP6 TP5 TP4 TP3 TP2 TP1 TP13 TP12 TP64 TP60 TP50 TP10 U26:A 4053 876 14 13 12 11 16 C7 10UF + 1K R10 100PF C8 P16:1 10K R220 R136 10K D8 DL4004 K2:A 4.99K R195 FB38 FB37 U20:A LM833 1 2 3 4 C110 10PF R192 39.2K C108 .1UF C109 .1UF R193 39.2K R1944.99K 0 R241 0 R238 0 R240 0 R239 S1:B K2:C 22UF C102 + 0R236 0 R237 U17:A 4053 876 14 13 12 11 16 U17:B 4053 1 2 15 10 4053 U16:C 9 3 5 4 U2:A 4053 876 14 13 12 11 16 100K R26 4053 U4:A 786 1213 11 1416 MMBT3904 Q12 4.75K R119 10K R207 MMBT3904 Q11 4.75K R208 100K R149 100K R206 10K R118 10PF C49 10KR96 10K R95 P13:1 P14:1 10K R209 U20:B LM833 7 8 6 5 10KR143 U30:A LM833 1 2 3 4 C8010PF R14410K 10K R142 10PF C79 10K R141 U30:B LM833 7 8 6 5 10K R102 10KR103 10K R109 C52 10UF + 1.5K R108 LM393 U24:A 4 2 3 1 10PF C50 10K R104 649 R105 LM833 U22:A 4 3 2 1 C57 2.2UF + C56 10UF + U23:C SA575 1314 11 16 10K 3.9K 10K G 2012 8 15 C53 1UF + 10K R107 LM393 U24:B 6 5 8 7 47.5K R106 SA575 U23:A 9 4 7 6 3.9K 10K10K G 5 10 C51 1UF + 1UF C58 + R111 26.7K R110 33.2K 1UF C55 + C54 22PF U23:D SA575 19 18 17 .001UF C63 .01UF C62 .01UF C61 6.81K R117 4.75K R116 2.21K R115 SA575 U23:B 3 1 2 10K R113 1500PF C60 56.2K R114 56.2K R112 .022UF C59 LM833 U22:B 5 6 8 7 C48 10PF R9710K VR3 5K LM833 U38:A 4 2 3 1 6.81K R190 .0047UF C106 18.7K R191 .0015UF C107 LM833 U38:B 6 5 8 7 390PF C105 .022UF C104 7.68K R189 3.92K R188 U37:B LM833 7 8 5 6 C103 10PF 4053 U39:B 15 2 1 10 10K R187 R181 22.1K 1UF C100 + R174 20K R134 20K C73 1UF + 47.5K R175 MMBT3904 Q13 301 R178 10K R210 C115 1UF + MMBT3904 Q14 301 R185 R184 20K 56PF C99 47.5K R186 R211 100K R212 100K 1UF C116 + LM833 U36:B 6 5 8 7 LM833 U37:A 4 3 2 1 C114 10PF U39:C 4053 4 5 3 9 47.5K R213 U43:B LM833 7 8 6 5 10KR214 10KR215 10PFC117 LM833 U43:A 4 3 2 1 C97 1UF + 10PF C64 U25:A LM833 1 2 3 4 U26:C 4053 4 5 3 9 1UF C65 + R121 10K 47.5K R122 U27:B LM833 7 8 6 5 10KR123 10KR124 10PFC66 LM833 U27:A 4 3 2 1 U28:A LM833 1 2 3 4 C71 10PF R129 39.2K R132 4.99K C69 .1UF C70 .1UF R130 39.2K R1314.99K LM833 U25:B 6 5 8 7 22.1K R133 C72 1UF + J6 1 3 2 J8 1 3 2 S1:A T1 K2:B 22UF C96 + S1:D T2 S1:C 100UF C101 + 100UF C95 + R177 121 R182 121 U36:A LM833 1 2 3 4 C98 100PF C93 100PF R180 20K R179 20K J2 12 3 R137 3.92K R138 7.68K C75 .022UF C76 390PF U29:A LM833 1 3 2 4 R139 6.81K U29:B LM833 7 8 5 6 C78 .0015UF R140 18.7K C77 .0047UF 10PF C74 U26:B 4053 1 2 15 10 U35:A LM833 1 2 3 4 R176 20K R173 20K 56PF C94 U35:B LM833 7 8 5 6 5K VR2 3.32K R135 100K R171 100K R172 C92 1UF + 3.32K R196 LM833 U41:B 5 6 8 7 R197 10K R198 10K 10KR201 10PFC112 LM833 U41:A 4 3 2 1 R20010K R9910K R98 10K R19910K 10K R101 R100 10K R126 301 10UF C67 + 10UF C68 + R125 301 R216 301 R217 301 10UF C118 + 10UF C119 + J3 2 3 1 Q9 MMBT3904 K1 D7 DL4004 R94 10K C111 10PF C90 10UF + 301 R167 U34:B LM833 7 8 6 5 10KR165 10KR166 10PFC89 LM833 U34:A 4 3 2 1 C88 10PF 10K R162 10KR163 10K R164 U31:A LM393 1 3 2 4 R147 39.2K R146 22.1K R145 39.2K U31:B LM393 7 8 5 6 1UF C81 + R148 100K C127 2.2UF + C126 10UF + U45:C SA575 1314 11 16 10K 3.9K 10K G 2012 8 15 1UF C128 + R229 26.7K R228 33.2K 1UF C125 + C124 22PF C130 1500PF R231 10K C129 .022UF R230 56.2K U45:B SA575 2 1 3 R232 56.2K C123 1UF + C122 10UF + 10K R227 1.5K R226 10K R225 LM393 U46:A 4 2 3 1 LM393 U46:B 6 5 8 7 47.5K R224 SA575 U45:A 9 4 7 6 3.9K 10K10K G 5 10 C121…

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