OPERATING MANUAL VARIABLE ATTENUATOR AND INTERFACE BOX -12- AUDIO OUT CABLE WIRING HI-Z

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1 KACHINA DRAKE T4XB COLLINS S, S COLLINS KWMA AUDIO OUT CABLE WIRING COLLINS V, V, KWS Hallicrafters E.F. Johnson DRAKE TR7 + Mic - Mic 8 Pin Mic Connector Pin 8 Pin Mic Connector Pin 8 Pin Mic Connector Pin 4 Pin Mic Connector Pin 4 Pin Mic Connector Pin 4 Pin Mic Connector Pin 4 Pin Mic Connector Pin Pin Mic Connector Pin Pin Mic Connector Pin Pin Mic Connector Spring/Case ibox VARIABLE ATTENUATOR AND INTERFACE BOX 4 PIN TEN TEC EXCEPT ORION TEN TEC ORION Kenwood TS5/TS5 TS8/TS8 Yaesu FT Series 4 Pin Mic Connector Pin 4 Pin Mic Connector Pin 4 Pin Mic Connector Pin 4 Pin Mic Connector Pin 4 Pin Mic Connector Pin 4 Pin Mic Connector metal shell 4 Pin Mic Connector Pin 4 4 Pin Mic Connector Pin 4 Pin Mic Connector Pin 4 Pin Mic Connector Pin 4 Pin Mic Connector Pin 4 Pin Mic Connector Pin 4 Pin Mic Connector Pin FT9DM Galaxy -- 4 Pin Mic Connector Pin 4 Pin Mic Connector Pin 4 Pin Mic Connector Pin DIN connectors shown on the side to be soldered DO NOT SOLDER TO SHIELD OF DIN OPERATING MANUAL

2 ibox VARIABLE ATTENUATOR AND INTERFACE BOX OPERATING MANUAL April WIHY TECHNOLOGIES Julius D. Jones 9 Vanessa Lane Staatsburg, N.Y. (58) (845) Home Page: c WIHY, ALL RIGHTS RESERVED AUDIO OUTPUT CABLE WIRING Japan Radio JST-5 JST-45 Yaesu FT99/ft99 FTMP/M-V Alinco DX77 Kenwood TS/4 TS4/44 TS85/TS87 TS9/94/95 SG K KACHINA ICOM / /756 PRO Attenuator Audio Out to Xcvr cable wiring Yaesu FT/7 FT77/747/757/767 FT847 FT/D ICOM BALANCED MODULATOR / 756 PRO H Pin Mic Connector Pin 8 8 Pin Mic Connector Pin 5 8 Pin Mic Connector Pin 8 Pin Mic Connector Pin 8 Pin Mic Connector Pin 8 8 Pin Mic Connector Pin 8 8 Pin Mic Connector Pin 8 Pin Mic Connector Pin 8 Pin Mic Connector Pin 8 Pin Mic Connector Pin 8 Pin Mic Connector Pin 5 8 Pin DIN Connector Pin 4 8 Pin DIN Connector Pin 8 Pin DIN Connector Pin DIN connectors shown on the side to be soldered DO NOT SOLDER TO SHIELD OF DIN

3 AUDIO OUTPUT CABLE WIRING Attenuator Audio Out Wiring LOW Z TRS BALANCED OUTPUT HI Z TRS BALANCED OUTPUT LOW Z XLR BALANCED OUTPUT XLR BALANCED OUTPUT LOW Z Single channel Input to Computer Sound Card LOW Z UNBALNCED /4 MONO CONNECTOR FLEX XLR cable ELECRAFT KX + Audio Male XLR connector pin Male XLR pin Shield not connected 8 Pin Mic Connector Pin 5.5 mm stereo connector DIN connectors shown on the side to be soldered DO NOT SOLDER TO SHIELD OF DIN INTRODUCTION ibox by WIHY ibox is a variable audio attenuator designed to be a versatile accessory for the serious amateur. ibox can be used to not only provide the proper audio levels and impedance matching between pieces of equipment in your audio chain or to your amateur radio equipment but it may also be used to eliminate ground loops that usually show up in the form of hum. ibox can also be used to provide RF isolation between components. ibox achieves its outstanding isolation through use of a high quality audio transformer and filter networks. ibox s input impedance is 6 ohms. The output impedance of the ibox may be selected to be either 6 ohms or 5K ohms. This means the ibox can be connected to modern and vintage radio equipment as well as between audio rack components. ibox was designed at the request of amateurs who were using studio audio equipment and needed a more versatile way to level match, RF isolate, audio isolate, control and impedance match audio and transmitting components.. We feel so confident that you will be delighted with the ibox we offer a day money back, no questions asked, guarantee. The ibox represents affordable audio technology designed for amateur radio use

4 ibox CONTROLS AUDIO INPUT CABLE WIRING Audio Input Wiring Behrenger Mixer (5,8,...) IBox / iplus () Output Level Control (R) This potentiometer (pot.) adjusts the audio output of the ibox. Turning the pot. fully counter - clockwise will obtain a signal at the Audio Output about 48dB less than the input signal. Turning the pot. clockwise will increase the signal level to the Audio Output. LOW Z TRS BALANCED Output UNBALANCED OUTPUT () Audio Input (J) This /4 stereo jack (also known as a Tip-Ring-Sleeve jack) is used to bring audio into the ibox. TIP LOW Z XLR OUTPUT LOW Z COMPUTER OR OTHER SINGLE STEREO CHANNEL OUTPUT TO ATTENUATOR RING SLEEVE Bal XLR OUTPUT See page 8 for additional cable wiring information. TS UNBALANCED OUTPUT to XLR male input LOW Z TRS BALANCED Output to Balanced male XLR

5 Millivolt Output in in Attenuation in db E RFC-47 uh C RFC4 47 uh C C ATTENUATION OF AUDIO INPUT AS R CHANGES WHERE R= Ohms 6 4 Value of R in K ohms Figure A MILLIVOLTS OF AUDIO OUTPUT AS R CHANGES WHERE R= Ohms AND VOLT OF AUDIO IS APPLIED TO THE INPUT 6 4 ibox AUDIO OUT RESPONSE CHARACTERISTICS Figure E E T : Value of R in K ohms Figure B R K or K fixed or variable E5 R E4 k 6: Millivolt Output R R-K Attenuation in db R4 K C4 C5 RFC 47 uh C6 RFC 47 uh ATTENUATION OF AUDIO INPUT AS R CHANGES WHERE R= Ohms 6 4 Value of R in K ohms Figure C MILLIVOLTS OF AUDIO OUTPUT AS R CHANGES WHERE R= Ohms AND VOLT OF AUDIO IS APPLIED TO THE INPUT Note: R Pot factory installed at K ohms R factory installed at ohms Value of R in K ohms Figure D E9 C7 uf E6 Out + E7 Out E Assumes 6 ohm load on attenua tor output Att enuation* R= to R= Max Impedance to radio R= to R=Max Impedance on Xfmr "T" R= to R= Max R R R R4 '-6. to db 6 to to to db 75 to 99 9 to 994 ibox CONTROLS () Input (J) This female RCA connector is used to provide push to talk control (). Grounding the center jack of the connector grounds the line of the Audio Out connector. (4) Audio Output (J) This 5 pin DIN connector provides 4 attenuated Input audio to the connector. The audio provided is isolated from the input audio. The user may wire cables for either (6 ohms) or (5K) balanced or unbalanced. function is also provided at this connector Audio Output 5 Pin Male DIN Din connectors shown on side to be soldered + Mic Balanced - Mic Output Hi-Z Output Figure

6 Audio Source QUICK START TUTORIAL J V AUDIO IN Foot Switch V J ibox AUDIO OUT. Turn the Output Level Control fully counter clockwise. (See page 4). Connect the audio source into the Audio Input jack (see page 4) using a /4 stereo plug. Page 9 shows some possible cable configurations. Make sure the sleeve of the /4 stereo plug is connected to the ground of the audio source.. Connect the Audio Output (see page 5) to what you would like to drive. See pages - for possible cabling configurations. Make sure that the ground pin on the DIN connector is connected to the ground of what is being driven. 4. If you will be using a foot switch to key a transmitter or other device connect it to the RCA connector (see page 5). 5. Prior to applying an audio signal to the input of the ibox turn the Output Level Control fully counter clockwise. (See page 4). 6. Apply an audio signal to the input of the ibox, Turn the Output Level Control clockwise until proper audio level for the device being driven is obtained. Minimizing the effects of RF A very common problem many amateur radio operators experience with professional audio equipment while transmitting is audio distortion caused by RF. Techniques have been developed to minimize the effects of RF. In a perfect world one should use a star grounding configuration, using heavy gauge braided wire from grounded equipment to the central ground point and a short run of a heavy gauge wire to a ground rod. In a perfect world all audio equipment should be connected to a high quality power conditioner. In a perfect world all audio cabling should use quality shielded wire (double shielded is best). In a perfect world all audio signals cascading through the audio rack network should be isolated with high quality audio transformers. Few of us live in a perfect world so when we have problems we have to make the RF environment we live in as good as possible J V Radio or Audio Component in in Shield ibox SCHEMATIC AND WIRING PICTORIAL E E E RFC-47 uh C RFC4 47 uh J (TRS connector) Black Shield Red C T : 6:6 C R K or K fixed or variable E5 R E4 K Red R R-K Audio IN tab R= K factory wired 4 Black R4 K C4 C Parts List C-C6 - mylar C7 - uf radial electrolytic C8,C9 -. uf monolithic ceramic capacitors J- /4 stereo jack J - 5 Pin DIN J RCA panel mounted jack Figure A Figure B Figure C RFC 47 uh C6 RFC 47 uh E9 C7 uf J 5 pin DIN connector Audio Out C9. uf 47K ohm E6 Out + E7 Out Red E8 Black J (RCA connector) C8. uf R - k ohm resistor R,R4 - K ohm ¼ watt 5% resistor R - fixed resistor or variable potentiometer R5-47K ¼ watt 5% resistor RFC - RFC4-47 uh miniature r.f. Choke T - : 6 ohm Audio Transformer Shield 4

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