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W2IHY

8 BAND

AUDIO EQUALIZER

AND

NOISE GATE

OPERATING MANUAL

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Summary of Contents for W2IHY

Page 1: ...W2IHY 8 BAND AUDIO EQUALIZER AND NOISE GATE OPERATING MANUAL ...

Page 2: ...T PTT GND GND GND GND GND GND 4 Pin Mic Connector Pin 3 4 Pin Mic Connector Pin 2 4 Pin Mic Connector Pin 3 4 Pin Mic Connector Pin 2 4 Pin Mic Connector Pin 2 4 Pin Mic Connector Pin 3 4 Pin Mic Connector Pin 1 4 Pin Mic Connector Pin 3 4 Pin Mic Connector Pin 1 4 Pin Mic Connector Pin 1 2 Pin Mic Connector Pin 1 2 Pin Mic Connector Pin 2 2 Pin Mic Connector Spring Case 4 Pin Mic Connector Pin 2 ...

Page 3: ...in Mic Connector Pin 8 8 Pin Mic Connector Pin 5 8 Pin Mic Connector Pin 3 8 Pin Mic Connector Pin 1 8 Pin Mic Connector Pin 1 8 Pin Mic Connector Pin 7 8 Pin Mic Connector Pin 5 8 Pin Mic Connector Pin 6 Shield of Cable Shield of Cable Shield of Cable Shield of Cable 8 Pin Mic Connector Pin 2 8 Pin Mic Connector Pin 2 8 Pin Mic Connector Pin 6 8 Pin Mic Connector Pin 7 8 Pin Mic Connector Pin 7 8...

Page 4: ...alanced Output to Low Impedance Radio 5 PIN DIN MIC OUTPUT CONNECTION Low Impedance Unbalanced Output to Low Impedance Radio Low Impedance Unbalanced Output to High Impedance Radio High Impedance Unbalanced Output to High Impedance Radio DO NOT CONNECT MIC WIRE SHIELD TO SHIELD OF DIN CONNECTOR CONNECT ONLY AS SHOWN MIC OUT A B 5 Pin Male DIN Din connectors shown on side to be soldered Gnd Mic cab...

Page 5: ...ing Mic Out Wiring Options 25 Mic Out and Pwr Cable Wiring 26 27 MIC IN Shortest Lead Shortest Lead Shortest Lead Shield not Connected J16 C41 01uf J2 MIC IN PIN 1 PIN 7 J9 PHONES PIN 1 PIN 2 J1 3 J1 1 J1 15 J1 2 J1 16 J1 14 J1 13 10 16 1 2 10 6 10 E17 Note that J1 X is the flat ribbon cable shown on page 15 S h ie ld S h i e l d Shield Shield S h ie ld S h i e l d S h i e l d S h i e l d Shi eld ...

Page 6: ...r 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 etc The Noise Gate eliminates the aforementioned noise from being transmitted On the air tests in high ambient noise conditions have shown the Noise Gate to be very effective The removal of moderate to...

Page 7: ...S1 Phones monitor Volume Control R29 7 1 2 3 4 5 6 9 8 7 8 BAND EQ BOARD PC BOARD LAYOUT AND PARTS Mounted on pin side of P C board 22 C15 1 uF mylar C16 1 uF monolithic C17 18 uF mylar C18 19 4 7 uF Tantalum electrolytic C20 100 uF electrolytic R1 10 ohm watt 5 Res R2 R3 1K ohms watt 5 Res R4 3 3k ohm 10 pin 9 RES SIP R5 R6 3 3K ohm 10 Pin 5 Res SIP R7 15 0K ohm watt 1 Res R8 100K ohm 10 Pin 9 Re...

Page 8: ...ndicate 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 passed gated through to the output When the Noise Gate On Off Switch 5 is in the off position the noise gate LED is on 8 8 BAND EQ MOTHER BOARD PC BOARD LAYOUT AND PARTS 21 Parts mounted on pin side of P S...

Page 9: ...ise Pushing this control down will make the unit more sensitive to background noise 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 This LED is used to help adjust the MIC In Gain pot When the LED ...

Page 10: ...e best setting for you If you have medium to high levels of ambient noise present when you are transmitting with the 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 ...

Page 11: ...g jumper supplied onto the pins at the bottom of the case otherwise leave it off Turn the switch on The orange yellow should go on using a screwdriver turn the located at the bottom of the unit clockwise until the just goes on Now turn the Mic in Level control counterclockwise such that when you speak into the mic using a screwdriver turn the control clockwise until the audio level as shown by you...

Page 12: ...ed REAR PANEL CONTROLS 17 C2 1uf 100 Hertz C1 01uf 7 R1 3 3K R2 3 3K R5 100 K U2b TL074 R6 100K R3 1 M R4 1 M Each EQ bandpass filter is very similar The center frequencies of each bandpass filter is determined by the values of the capacitors and resistors used The equations below define what capacitor values are required for a given center frequency Below is a schematic of a bandpass filter with ...

Page 13: ...100 K R8f 100 K R17 100 K R21g 1M R23c 1M R4g 3 3K R6b 3 3K R6c 3 3K 5 V U3c TL074 10 9 8 R2 1K R3 1K R8G 100 K R23b 1 M 8 8 8 1 6 5 2 3 1 5 6 1 7 1 4 3 1 4 3 C17 18uf C15 1uf C14 047uf C13 022uf 400 Hertz C6 0022uf 200 Hertz 100 Hertz C10 01uf C8 0047uf R8a 100K 5V 1 3 5 6 7 2 R7 14 3K 1 R4b 3 3K R5b 3 3K R4c 3 3K R5c 3 3K R4d 3 3K R14 100 K R21d 1M R22c 1M R21c 1M R8c 100K R21A 1M R22a 1M R11 10...

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