B5DH214Handheld Wireless Microphone Transmitter

TELEX Owners Manual/Operating Instructions Telex Evi Model NHTU UHF Transmitter General...... The Telex Evi NHTU is a 10 Channel Hand Held Transmitter operating within the UHF frequency range. ( 518.0 to 806.0 MHz ) The transmitter is especially suited for use wherever a small, reliable hand held wireless microphone is required. Versions are available with optional microphone capsules. Please note that each transmitter requires a matching receiver with the same operating frequency group. Standard “off the shelf” frequencies are available. Please see the Telex Price List for information. The Telex Evi NHTU Series feature 10 channel versatility as well as economy. SETUP: Before setting up the transmitter, it is necessary to set up the receiver or at least check the receiver operation if the receiver has been installed previously. Place the receiver in an area with the antennas in clear view of the transmitter operating area. Connect the receiver audio output to the audio input of the mixer, amplifier or other device. Turn the input to these items down at this point. Apply power to the receiver. Set the receiver channel to match the transmitter setting. Note that there should be no "Carrier" or TX light on at the receiver at this time. If there is a light on, this indicates RF interference to the channel and the interference must be eliminated or you should consider changing the channel frequency. TELEX Evi NHTU Page 2 If the interference is not severe, suitable operation can sometimes be made possible by adjusting the squelch control until the light goes off. (Transmitter off) If the light cannot be made to go off by adjusting the squelch control, then the channel should be abandoned. Set the receiver audio output control to its midpoint (50 % of rotation). Set the audio device volume control to its normal setting. Open the transmitter battery door and install a fresh 9 volt alkaline battery. Place the transmitter in the position desired and turn on the power switch. The Green battery light should flash once and go off. The carrier light at the receiver should now be on. You are now ready to use the microphone. Place the transmitter Audio Switch in the ON position (up). Talk in your normal tone and volume. If the Red light on the transmitter comes on or continues to flash as you speak, turn down the microphone gain control until the Red light is off or only flash’s on occasion. If the audio to the mixer or amplifier sounds distorted or clipped, try reducing the input volume of the mixer or amplifier, or turn the volume down on the receiver. FCC REGULATIONS The Telex EVi Model NHTU is Type Accepted under United States Federal Communications Part 74. Licensing of Telex equipment is the users responsibility and licensibility depends upon the users classification and the frequency selected. Telex strongly urges the user to contact the appropriate telecommunications authority before ordering frequencies other than factory preset frequencies. CAUTION: Changes or modifications made by the user could void the users authority to use the equipment. TELEX Evi NHTUPage 3 INDUSTRY CANADA INFORMATION Operation is subject to the following two conditions: (1) This device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device.

LOW PASS FILTERAMPLIFIERAMPLIFIERAMPLIFIEROSCILLATOR LIMITER MODULATION COMPRESSORPRE-EMPHASISAMPLIFIER SWITCHPLL MICROPROCESSOR 4 MHZ CHANNEL SWITCH MIC IN 518 TO 806 MHZ NHTU BLOCK DIAGRAM CHG.NO.DATEAPPD A SIZECODE IDENT 57010 SHEET: DWG. NO. REVISIONS DESCRIPTION SPECIFICATION hy-gain O RO R TELEX TELEX COMMUNICATIONS INC. Lincoln Nebraska U.S.A This drawing, written description or specification Lincoln, NE., and shall not be released, disclosed, represents a proprietary product of TELEX, nor duplicated without the written permission of TELEX QTYDESCRIPTION UNSPECIFIED LIMITS OF TOLERANCE FRACTION: MACHINED FINISH: 64 DECIMAL: .X = .050 IN - + .XX = .030 IN - + .XXX = .010 IN - + O - + O - + ANGLES 1 , BENDS 2 STRAIGHTNESS AND/OR FLATNESS .005 IN./1 IN. CONCENTRICITY .010 TIR O UNMARKED ANGLES, BENDS AND INTERSECTIONS 90 THREADS- EXT. CLASS 2A INT. CLASS 2B NEXT ASSY.USED ON APPLICATIONS DATE DR BY CHK BY APPD. PROD. MATERIAL: ITEM PART NO. SCALE: TITLE LTR NHTU ACTIVE DEVICES DES DEVICE FUNCTION 1. Q1 ZVN4106 Variable resistor 2. Q2 ZVN4106 Variable resistor 3. Q3 MMBT3904 Rectifier 4. Q4 MMBT3906 Rectifier 5. Q5 MMBT3906 Current mirror 6. Q6 MMBT3906 Current mirror 7. Q7 MMBR901 Amplifier 8. Q8 MMBR901 Amplifier 9. Q9 MMBT3904 Switch 10. Q10 MMBT3906 Current source 11. Q11 MMBR901 Amplifier 12. U1 LM833 Amplifier / Comparator 13. U2 NE570 Compressor / Voltage regulator 14. U3 AT90S1200 Microprocessor 15. U4 TRF2050 PLL

ID LABEL / LOCATION INFO

NHTU Operational Description A. Audio Input from the microphone is amplified by U1B. VR1 is user adjustable and varies the gain from 0 to 40 dB. C14, R19 and R20 provide pre-emphasis at 50 microseconds. U2A is a 2:1 compressor that is used for noise reduction. A modulation limiter is formed by Q1-Q6 and associated components. Q4 detects positive audio peaks and negative peaks are handled by Q3, Q5, and Q6. The resulting current charges C8 and turns on Q1 and Q2, attenuating the incoming audio. VR2 is used to set the frequency deviation. B. RF Output HY1 is a VCO that runs at the output frequency. No multiplication takes place in the RF chain. Q7, Q8, and Q11 buffer and amplify the carrier. C47, C48, C49, L9 and L10 form a matching network and low pass filter. Q10 is used to control the current through the amplifier section. Q9 is used to switch the amplifier on after the synthesizer achieves lock. C. Synthesizer U4 is a PLL that is serially loaded from microprocessor U3. U3 monitors S3, the channel selection switch, and loads new data into U4 if the switch is changed. RF from the VCO is fed to the PLL via C34 and R34. L11 removes reference components coming out of U4. Y1 provides the reference frequency for U4. VC1 is used to set this to exactly 4 MHz. U4 controls the VCO through the loop filter consisting of R35, R36, C31 and C32. Modulation is fed to the bottom of C31.

770598a.rep NHTU Parts List Bill of Materials 770598A.S01 Quan Type Value Ref Designators ======================================================================== 1 1200B AT90S1200 U3 1 570AC NE570 U2 1 7025 TRF2050 U4 1 9DA LM833 U1 1 C * C1 6 C .1UF C10,C22,C27,C28,C29,C7 1 C .0015UF C14 4 C 100PF C18,C46,C5,C51 1 C NO PART C2 1 C 22PF C23 1 C 33PF C24 11 C .001UF C25,C26,C30,C32,C36,C39, C42,C43,C44,C45,C52 1 C 10PF C34 1 C 5.6PF C35 5 C ** C37,C40,C47,C48,C49 30-Nov-99 12:28 Page 1 Bill of Materials 770598A.S01 Page 1 770598a.rep Quan Type Value Ref Designators ======================================================================== 1 C 12PF C38 1 C 3.9PF C41 1 C 47PF C8 9 CE 10UF C11,C12,C15,C16,C21,C31, C4,C6,C9 1 CE .22UF C13 3 CE 1UF C17,C19,C33 1 CE 2.2UF C20 1 CE * C3 1 CV 5-20PF VC1 1 D 1N5817 D1 1 DD2 BAV99 D2 3 DL VAL DS1,DS2,DS3 6 E VAL E1,E2,E3,E4,E5,E6 1 LA * L1 2 LA 8NH L10,L5 30-Nov-99 12:28 Page 2 Bill of Materials 770598A.S01 Quan Type Value Ref Designators ======================================================================== 8 LA .22UH L11,L12,L2,L3,L4,L6,L7, Page 2 770598a.rep L8 1 LA 27NH L9 1 P + B1 1 P - B2 3 QNEBC MMBR901 Q11,Q7,Q8 2 QNEBC MMBT3904 Q3,Q9 2 QNT ZVN4106 Q1,Q2 4 QPEBC MMBT3906 Q10,Q4,Q5,Q6 1 R * R1 7 R 1K R10,R14,R15,R16,R17,R18, R27 7 R 10K R11,R13,R30,R31,R38,R5, R6 1 R 3.9M R12 1 R 26.7K R19 2 R 100 R2,R42 30-Nov-99 12:28 Page 3 Bill of Materials 770598A.S01 Quan Type Value Ref Designators ======================================================================== 1 R 6.65K R20 1 R 24.3K R21 2 R 4.99K R24,R29 Page 3 770598a.rep 1 R 13K R25 1 R 16.2K R26 1 R 8.25K R28 1 R 20K R3 1 R 150K R32 1 R 511K R33 1 R 221 R34 2 R 475 R35,R7 2 R 4.75K R36,R46 2 R 47.5 R37,R40 3 R 47.5K R39,R4,R9 1 R 22K R41 30-Nov-99 12:28 Page 4 Bill of Materials 770598A.S01 Quan Type Value Ref Designators ======================================================================== 1 R 22.1 R43 1 R 6.81K R44 2 R 100K R45,R8 1 R 10 R47 1 R 26.7 R48 Page 4 770598a.rep 1 RS 221 R49 1 RVA 100K VR1 1 RVA 100 VR2 1 S10 VAL S3 2 SSS VAL S1,S2 9 TP TP1,TP2,TP3,TP4,TP5,TP6, TP7,TP8,TP9 1 VCO-500SQ VAL HY1 1 Y 4MHZ Y1 Total Parts: 155 30-Nov-99 12:28 Page 5 Page 5 NHTU Tune-up Info 1. Set channel switch to 0. Set mic gain (VR1) max CW. 2. Feed 7.8mV at 1 kHz across E2 (hot) and E1 (gnd). 3. Connect a frequency counter and deviation meter from E5 (rf out) to ground. 4. Connect the battery contacts to 9 volts DC. 5. Turn unit on and adjust VC1 for the channel 0 frequency. 6. Adjust VR2 for +/- 40 kHz deviation.

C34 10PF 221 R34 L12 .22UH E4 E5 4.99K R29 4MHZ Y1 5-20PF VC1 22PF C23 10K R31 33PF C24 AT90S1200 U3 13 45 19 18 17 1 10 9 6 7 8 2 12 14 11 20 .22UH L11 1K R10 C9 10UF + TP7 TP6 TP5 TP4 10K R30 TP8 .1UF C22 BAV99 D2 .22UH L3 .22UH L2 1K R27 DS2 8.25K R28 DS3 S2 TP2 + - TP3 C33 1UF + NO PART C2 * L1 * C1 * R1 C4 10UF + .001UF C25 47.5 R37 S1 4.99K R24 .1UF C10 E3 E1 C3 * + R2 100 16.2K R26 NE570 U2:B 1.8V 20K 5 6 7 R25 13K MMBT3906 Q4 .1UF C7 47.5K R4 20K R3 10K R5 R6 10K 10UF C6 + R9 47.5K 47PF C8 U1:A LM833 1 8 3 2 LM833 U1:B 5 6 7 4 VR1 100K 10UF C11 + Q3 MMBT3904 R17 1K R14 1K R15 1K R18 1K 10UF C12 + Q5 MMBT3906 C14 .0015UF .22UF C13 + 6.65K R20 26.7K R19 1N5817 D1 TP1 C16 10UF + 24.3K R21 C15 10UF + C21 10UF + C20 2.2UF + C19 1UF + 200K R23 200K R22 100PF C18 C17 1UF + U2:A NE570 1.8V G 20K 10K 30K 11 20K 15 14 10 12 1694 GND 13 VCC Q6 MMBT3906 R16 1K ZVN4106 Q1 ZVN4106 Q2 DS1 R11 10K R12 3.9M R7 475 100PF C5 R8 100K R13 10K E2 .001UF C32 4.75K R36 47.5K R39 10K R38 R41 22K .001UF C26 MMBT3904 Q9 R45 100K L8 .22UH C46 100PF C45 .001UF .1UF C28 C31 10UF + 475 R35 C35 5.6PF R40 47.5 Q7 MMBR901 R42 100 C36 .001UF C37 ** C38 12PF R43 22.1 Q8 MMBR901 R44 6.81K L5 8NH C40 ** L4 .22UH C39 .001UF C41 3.9PF R47 10 Q11 MMBR901 Q10 MMBT3906 C44 .001UF R48 26.7 L6 .22UH C42 .001UF .1UF C27 150K R32 .1UF C29 R33 511K .001UF C30 C43 .001UF R46 4.75K .22UH L7 U4 TRF2050 3 2 1 8 18 13 5 6 7 14 20 19 15 101217164 TP9 HY1 7 3 15 RFVt Vs 100PF C51 C49 ** L10 8NH C48 ** L9 27NH C47 ** S3 C 1 2 4 8 100 VR2 221 R49 .001UF C52 E6 TJY10/27/99 DN UPDATED SCHEMATICPD SYN TRANSMITTER NHTU 10 CHNL PCPRE-RELEASED. REFERENCE PCB : 750504 770598 770598 RB 7/6/99 10/1/99 REFERENCE DESIGNATOR C1C3R1MIC HEAD MIC HEAD TABULATION ELEC/167/267A--- 10UF 767A.033UF---121 OHM --- * R.O.W. 752-825MHz 512-566MHz FREQ. RANGE 566-620MHz 620-680MHz 680-752MHz 752-806MHz 680-752MHz 620-680MHz 566-620MHz 518-566MHz FREQ. RANGE US ** FREQUENCY TABULATION --- --- --- --- --- --- C49C48C47C40C37 REFERENCE DESIGNATOR 3.9PF 3.9PF 3.9PF 4.7PF 4.7PF 3.3PF 3.9PF 4.7PF 5.6PF 6.8PF 1.0PF 1.2PF 1.5PF 1.8PF 2.2PF 1.2PF 1.8PF 3.9PF 2.7PF A?11/10/99 ADD R2 TO 767A MODEL, REMOVE FROM MIC HEAD TABULATION. --- L1 22mH D SHT REV STATUS REV SHEET 4321 = .050 IN = .030 IN = .010 IN DESCRIPTIONQTY PART NO hy-gain O RO R TELEX TELEX COMMUNICATIONS INC. Lincoln Nebraska U.S.A This drawing, written description or specification represents a proprietary product of TELEX, Lincoln, NE., and shall not be released, disclosed, nor duplicated without the written permission of TELEX. NEXT ASSY. USED ON ITEM PROD APPD. CHK BY DR BY DATE SHEET SIZE TITLE MATERIAL: DESIGNATOR DWG.NO. 57010 CODE IDENT SCALE APPLICATIONS ANGLES 1 : BENDS 2 STRAIGHTNESS AND/OR FLATNESS .005 IN./1 IN. CONCENTRICITY .010 TIR UNMARKED ANGLES, BENDS o AND INTERSECTIONS 90 THREADS- EXT. CLASS 2A INT. CLASS 2B - + + + - - oo + - + 64 FINISH: MACHINED - FRACTION: .XXX .XX .X DECIMAL: UNSPECIFIED LIMITS OF TOLERANCE APPDDATECHG NOLTRDESCRIPTION REVISIONS NOTES: