Dual Band Equalizer User Manual
Contents
1. 17 Mic Out amp Pwr Cable Wiring 18 3 TABLE OF CONTENTS INTERNAL WIRING Rear Panel Controls om Pictorial 9 Mic Select 9 Mic Input 9 Mic Input RCA 12 T Ra PTT Input RCA 12 T Mic Output 12 POWT meen 12 Bottom Panel Controls Pictorial 13 Mic In Gain 13 Mic Output Level 13 Cu s RM art of Gop Tus f i Id Shield not P Is D Bis Connected Getting Started Tutorial 14 15 Adjusting Mic In Level Adjusting Mic Out Level Adjusting Noise Gate Level eos Adjusting Noise Gate Delay Adjusting the Equalizer 4 17 15 PC BOARD LAYOUT AND PARTS C20 N e W2IHY AUDIO EQUALIZER NOISE GATE Asz 9 REV 1 COPYRIGHT 1995 No part installed in parts filled in GREY C5 R23 R24 C1 C3 C6 C14 4 7 uf Miniature Radial Electrolytic 50V REG1 7805 5V Linear Regulator in T220 Case Use Heat Sink C5 not used C8 22 uf Minature Electrolytic 16 V C9 C12 C15 100uf Miniature Radial Electrolytic 50V R3 C7 C13 C16 C17 1 uf monolithic or Disc Ceramic 50V R4 R5 R6 10 ohm 1 4 Watt 5 Resistor C18 C19 1 uf Mylar Capacitor RFC1 RFC3 470 uh Miniature Epoxy Coated R F Choke R1 R22. 10K ohm 10 Pin 5 Resistor SIP Network 100 ohm 10 Pin 5 Resistor SIP Network 1K ohm 10 Pin 5 Resistor SIP Network C20 C21 01 uf Mylar Capacitor R25 1K ohm 1 4 Watt 5 Resistor C26 C29 001 uf Mylar Capacitor R7 R19 6 8K ohm 1 4 Watt 5 Resistor C22 033 uf Mylar Capacitor R20 10K ohm 1 4 Watt 5 Resistor C4 120 pf Ceramic Disc R8 R9 R10 47K ohm 1 4 Watt 5 Resistor R11 R21 R26 2 2K ohm 1 4 Watt 5 Resistor C25 560 pf Ceramic Disc C23 C24 470 uf Miniature Radial Electrolytic 16V 5 6K ohm 1 4 Watt 5 Resistor D1 D2 1N914 or 1N4148 Switching Diodes R23 R24 not used D3 1N4001 R22 3 8M 1 4 Watt 5 Resistor JMPR 2 Pin Strip Line Plug 100 and Shorting Block R12 R13 100K ohm Horizontal Mounted P C Trimmer J1 16 Pin IDC DIP Flat Ribbon Cable R14 OK ohm 1 4 Watt 5 Resistor J2 8 Pin Male Microphone Connector J3 5 Pin Female DIN Socket R17 J4 J5 RCA Chassis Mounted Phono Jack J6 5 Female Din Socket with 2 Pins removed S4 LED1 Panel Mount 5mm Green LED U1 LED2 Panel Mount 5mm Red LED U2 LED3 Panel Mounted 5mm Orange or yellow LED U3 Q1 2N3417 Switching Transistor BOLD printed parts mounted in case not on P C board R15 R16 R18 25K ohm Slide Potentiometer 100K ohm Slide Potentiometer 1 S3 SPST Miniature Toggle Switch 4 Pole 3 Position non shorting Rotary Switch TLO74 or JRC2060D 74HCOO
3. On the air tests in high ambient noise conditions have shown the Noise Gate to be very effective The removal of moderate to very high levels of ambient noise from the transmitted audio signal results in audio with increased clarity and presence Extensive testing was done of the Noise Gate and Equalizer The unit has been designed to work in high RF environments We feel so confident that you will be delighted with the unit we offer a 30 day money back no questions asked guarantee The W2IHY Audio Equalizer and Noise Gate represents affordable audio technology designed for amateur radio use FRONT PANEL CONTROLS W2IHY AUDIO ERUALIZER AND NOJSE GATE 6 This section describes each of the controls on the front panel You can read through this section now Some of the descriptions will be more meaningful after you first work through the getting started tutorial 1 Power On Off Switch 51 This switch turns the unit s power on and off 2 Power on LED LED3 This LED goes on when power is on in the unit 3 Equalizer On Off Switch S3 This switch turns the equalizer on and off When the equalizer is off adjusting the equalizer s bass and treble controls has no effect on the output audio 6 GETTING STARTED TUTORIAL The Noise Gate Delay control sets the decay time of the trailing edge of the Mic Out Audio when the noise gate turns off This circuitry exponentially reduces the audio output when there
4. 74LS123 74HC4053 600 ohms Primary 600 ohms Secandary audio transformer Parts mounted on Pin side of P C board 16 INTRODUCTION W2IHY AUDIO EQUALIZER AND NOISE GATE Analog and digital technology have for many years been used in the audio industry to do audio equalization and noise reduction Many amateurs have purchased audio equalizers and other equipment with the hope of improving their transmitted audio signal The amateurs who have succeeded have in many cases had to pay premium prices for audio equipment that not only required modifiing to properly interface with their amateur stations but also had to be hardened to tolerate R F The W2IHY Audio Equalizer and Noise Gate solves two basic problems many hams experience The Audio Equalizer allows the user to change the transmitted audio frequency response without changing microphones or microphone cartridges Transmitted audio that has a significant amount of high frequencies present can be used to work DX or communicate in band conditions where there is a significant amount of noise A balanced frequency response may be more desirable in strong signal full noise quieting environments Many amateur operators transmit audio in high ambient noise environments Typical high noise sources include linear amplifier fans dehumidifiers room air conditioners road and wind noise during mobile operation The Noise Gate eliminates the aforementioned noise from being transmitted
5. Mic Connector Pin 3 9 a e e 1 U gt 2 Audio 4 Pin Mic Connector Pin 1 4 PIN TEN TEC EXCEPT ORION 4 Pin Mic Connector Pin 3 7 a e e U gt 5 Shield of Cable Pin Mic Connector Pin 2 Audi ee 4 Pin Mic Connector Pin 1 Audio 4 Pin Mic Connector Pin 2 TEN TEC ORION Er GND Shield of Cable 4 Pin Mic Connector metal shell m 9 G e e 1 4 Pin Mic Connector Pin 3 Audio 4 Pin Mic Connector Pin 1 Kenwood O gx Audio 4 Pin Mic Connector Pin 4 TS520 TS530 PTT TS820 TS830 G 4 Pin Mic Connector Pin 2 Shield of Cable 4 Pin Mic Connector Pin 3 Audio Audio 4 Pin Mic Connector Pin 2 Yaesu FT101E FT901DM 4 Pin Mic Connector Pin 3 Galaxy S Shield of Cable 4 Pin Mic Connector Pin 1 7 e e 1 DIN connectors shown on the side to be soldered DO NOT SOLDER TO SHIELD OF DIN 18 TABLE OF CONTENTS Introduction 5 Front Panel Controls Pictorial seere 6 Power On Off 6 Power On LED 6 Equalizer On Off 6 Equalizer Bass 7 Equalizer Treble 7 Noise Gate On Off Switch 7 Noise Gate LED 7 Noise Gate Level 7 Noise Gate Delay 8 Mic Gain LED 8 Schematic 10 11 PC Board and Parts 16 Internal Wiring
6. W2IHY AUDIO EQUALIZER AND NOISE GATE W2IHY AUDIO EQUALIZER AND NOISE GATE OPERATING MANUAL W2IHY AUDIO EQUALIZER M AND NOISE GATE u px S Pie cometer Pn JST 245 8 Pin Mic Connector Pin 7 Yaesu FT990 ft992 8 Pin Mic Connector Pin 6 FT1000MP M Shield of Cable Q 2 E RATI N G MAN UAL 8 Pin Mic Connector Pin 5 Kenwood 8 Pin Mic Connector Pin 1 TS130 140 2 TS430 440 8 Pin Mic Connector Pin 7 TS850 TS870 TS930 940 950 8 Pin Mic Connector Pin 2 SG2020 i K2 K3 Sani 8 Pin Mic Connector Pin 8 8 Pin Mic Connector Pin 8 Yaesu FT102 FT747 757 767 M FT847 8 Pin Mic Connector Pin 6 D 2 4 FT1000 1000D e ce m e r 8 Pin Mic Connector Pin 7 8 Pin Mic Connector Pin 2 KACHINA W2I HY 8 Pin Mic Connector Pin 3 1 9 V L 2S 8 Pin Mic Connector Pin 1 ICOM 8 Pin Mic Connector Pin 1 8 Pin Mic Connector Pin 7 Staatsburg N Y 12580 raras 756 756 PRO 845 889 4253 E nn m E mail Julius W21HY COM 8 Pin Mic Connector Pin 5 8 Pin Mic Connector Pin 6 ICOM BALANCED 8 Pin DIN Connector Pin 4 Rev 4 MODULATOR 746 Home Page http www w2ihy com 756 756 PRO ee ee eo c 1995 W2IHY ALL RIGHTS RESERVED 781 NV 910H 8 Pin DIN Connector Pin 2 7600 7700 DIN connectors shown on the side to be soldered US DO NOT SOLDER TO SHIELD OF DIN 19 MIC OUT amp POWER CABLE WIRING Audio 4 Pin Mic Connector Pin 1 DRAKE TRT 4 Pin Mic Connector Pin 2 Shield of Cable Pin
7. and off When the noise gate is off the changing the gate delay or level controls has no effect on the audio When the noise gate is off audio is always being gated through the noise gate equalized to the output 7 Noise Gate LED LED1 This LED is used to help properly adjust the noise gate level control and to indicate when audio is being sent gated to the output The LED being on green indicates that audio is being gated through the unit to the output The LED being off indicates that audio is not being gated through to the output When the noise gate switch is in the off position 6 the noise gate LED is on 8 Noise Gate Level R18 This slide pot works only when the noise gate is on This control sets the level at which background noise will be not gated to the audio output Pushing this control up will make the unit less sensitive to higher background ambient noise Pushing this control down will make the unit more sensitive to background noise 7 FRONT PANEL CONTROLS 9 Noise Gate Delay R17 This control adjusts the length of time audio will be gated to the output after the noise gate has automatically turned off Noise gate LED off Pushing the delay slide pot up increases the delay decay time Pushing the pot down decreases the delay time 10 Mic Gain LED LED2 This LED is used to help adjust the MIC In Gain pot When the LED goes on this indicates that the Mic gain is set near the m
8. aximum recommended setting 17 Mic Jumper 18 19 BOTTOM PANEL CONTROLS Plugging shorting block in puts 5V on the mic In line of the microphone s cartridge 12 amp 13 Required for mic s like HM12 Hm36 SM6 and Heil HM i and electret microphones Mic In Gain R12 Changes the microphone amplifier s gain Gain is increased while speaking into microphone until Mic LED 10 just barely goes on LED should turn on 1 or 2 times in a sentence Clockwise rotation increases gain Microphone cartridges with very low output Like a Heil HC4 or Heil HC5 may require the Mic In Gain Control to be adjusted to maximum gain Mic Output Level R13 Changes the unit s audio output Clockwise rotation increases output This input is also low impedance 600 ohms 13 REAR PANEL CONTROLS 19 Mic Input J5 RCA female connector for auxiliary microphone input This connector works independently of the mic select switch and may be used for another audio source or microphone This input is also low impedance Do not use if mic is connected to J2 14 PTT INPUT J4 RCA female connector for auxiliary push to talk control A foot switch or other control may be connected to this connector Grounding the center jack of the connector grounds the push to talk line on the Mic Out 15 Mic Output J3 5 Pin female DIN connector that has noise gate equalizer audio plus push to talk outputted The audio output i
9. is no audio present in the Mic In The delay circuitry helps to make the transitions of gating and not gating of audio smooth and more pleasing to the ear The duration of the exponential decay is dependent on the setting of the Noise Gate Delay control The delay control set at a minimum value the slide pot all the way down will exponentially decay the audio in about 100 milliseconds The delay control set at a maximum value will allow the audio to decay over several seconds On the air tests show the mid part of the Noise Gate Delay range gives very pleasing audio transitions decay time of about 3 to 8 second You can experiment on your own to find the best setting for you If you have medium to high levels of ambient noise present when you are transmitting with the Noise Gate Switch in the off position when you stop talking your power meter will indicate R F still being transmitted set power meter on avg power to do this experiment When the noise gate is turned on and properly adjusted when you stop talking the power output will drop to the bottom of the scale no power output People who listen to your signal will be able to hear the difference and they will wonder where the noise went Adjusting The Audio Equalizer Turn the Equalizer Switch on Pushing the Treble control up will increase the amount of high frequencies present in the Mic Out audio Pushing the Bass control up will increase the amount of low frequencies pre
10. s transformer driven and designed to connect to a low impedance 600 ohms MIC OUT Mic 5 Pin Male DIN YC Mic Din connectors shown pu PTT on side to be soldered Gnd 16 Power 5 Pin Din connector 7 14 VDC input at 100 ma GND Power 5 Pin Male DIN Din connectors shown on side to be soldered 7 to 14V 12 REAR PANEL CONTROLS PTT MIC OUT PWR MIC SEL i Y IN 11 Mic Select S4 Three position switch that selects the ICOM KENWOOD or YAESU microphone plugged into the Mic Input 12 Mic Input J2 8 Pin microphone male connector Low impedance microphone 600 ohms plugs into here P n Icom Ken Yaesu 1 Mic Micl L2 s5v PTT 5v L5 PTT 5 6 o PTT 7 Gnd Mic Gnd pep ense
11. sent in the Mic Out audio On the air experimentation will be required to find the optimal settings based upon band conditions 15 GETTING STARTED TUTORIAL Before plugging the power transformer into the wall preset the following controls as indicated Power Equalizer and Noise Gate switches all off Mic Select to select microphone you will be using Connect your microphone into the Mic In rear connector Plug the power transformer module into the wall and into the Power connector of the unit Attach the microphone cable between your transceiver transmitter and the Mic Out of the unit If the microphone being used is an electret mic ICOM HM12 SM6 and requires D C on the mic line plug the shorting jumper supplied onto the MIC Jumper pins at the bottom of the case otherwise leave it off Turn the Power switch on The orange Power on LED should go on Adjusting the Mic Levels While talking into the microphone using a screwdriver turn the Mic In Level Control located at the bottom of the unit clockwise until the Mic LED just goes on The LED should go on 1 or 2 times in a sentence While talking into the microphone using a screwdriver turn the Mic Out Level control clockwise until the audio level as shown by your transceiver s transmitters metering is at the proper level If you are using push to talk on your transceiver you will have to push the PTT switch on your microphone while making this adjustment Noise Gate Adj
12. ustments Turn the Noise Gate Switch on Please note that when the Noise Gate Switch is off the Noise Gate LED should always go on indicating audio is being sent gated to the Mic Out When the Noise Gate Switch is turned on the Noise Gate LED may be on or off depending on the position of the Noise Gate Level control and the Mic In audio level Adjust the Noise Gate Level control until the Noise Gate LED just goes off This adjustment should be made with the level of ambient noise that will be present when you will be talking into the microphone If audio is coming from your transceiver s receiver s speaker you should turn off the audio When you now talk into your microphone the Noise Gate LED should go on indicating audio is being sent to the Mic Out When you stop talking the Mic Out LED should turn off indicating that audio is not being sent and background noise is not being sent gated to the Mic Out 14 FRONT PANEL CONTROLS 4 Equalizer Bass R15 This slide potentiometer works only when the equalizer is on Pushing the control up increases the amount of bass boost Pushing this controldown decreases the amount of bass boost 5 Equalizer Treble R16 This slide potentiometer works only when the equalizer is on Pushing this control up increases the amount of treble boost Pushing this control down decreases the amount of treble boost 6 Noise Gate On Off Switch S2 This switch turns the noise gate on
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