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is the only word to describe this: The NJR- IO is a Noise/QRM Reducer for SSB VOICEl It is the only device available that can reduce noise and remove heterodynes occuring in the presence of speech. What makes thi s possible? Real Time Digital Signal Processing (DSP) using a 40 MHz DSP chip! »The NIR-IO is a DSP audio processor that connects to the audio output of your receiver or transceiver and includes a built-in Speaker Amplifier. -Automatically Enhances Voice Reception by Reducing or Eliminating: Heterodynes & Tune-Ups White Noise Ignition Noise Power Line Noise RITY Interference "Woodpecker" -lncludes a Bandpass Filter Mode to Enhance CW andRITY . Forms a Variable Center Frequency Digital Filter with Selectable Bandwidth. Provides performance that analog filters can't match! -Work More Stations: Allows Reception ofOtherwise Unreadable Signals! -Reduces Listener Fatigue, -A Mustfor DXers, Contesters, and Field Day Ops. Order d irect: NIR-I O: $395; with 12V AC Adapteradd $ 12. We pay shipping. O rders 1-800-533-381 9 Tech 1·91 9-790-1048 FAX 1-91 9-790-1456 it into the standby mode). The functions 555 time as a rwatchdog rc also timer in case the 1016 doesn't get reset properly . If the voice storage chip goes into an overflow condition, the 555 timer wi ll power itdownafter20 seconds. Since tne current drain is so low in standby, you can leave the voice ID on for long periods without worryi ng about your battery life. The ISO chip interfaces directly to a small speaker. Our circu it laps off of the speaker output with two potentiometers, RII and R12 , which lower the audio signaloutput so that it can be used on your transceiver's microphone input (typically ebourzu10 100 millivolts). Assembly An etched and drilled printed circuit board (see the Pans List) is available which will make assembly of your voice ID easy . As an alternative, if you're used to breadboarding circuitry, everything should fit onone of the smaller prototype boards from Radio Shack. Ifyou use the PC board, you can attach the push-burton switches SI and S2, as well as S3 and the microphone, directly 10 the board. You only need to wire up a power switch, a battery pack and the speaker. If you want to interface the voice 10 to yourtransceiver, you will have to wire up an appropriate microphone cable (the proper mike diagrams should be listed in your owner's manual). For a contest microphone application, you will have to ma ke up a switch or relay to nip between the voice ID and your regular microphone (you can use the point marked PTT on the PC board and the schematic to trigger an automatic switch or relay when the board is talking). You may also be able to parallel the output of the voice ID across the audio input line on your rig's microphone plug. If you use a Radio Shack project enclosure, you can mou nt everything inside (including the battery) 10 give you one very compact package. If you want 10 use a 9-volt battery or your shack's 13.8voltsupply, you should wi re up the ~[r~1r~~ U2 7805 5-volt regulator (see the parts placement diagram and schematic). Your standby battery drain will be higher since the voltage draws a few milliamps in standby. For the ultimate in miniaturization, I use a tiny 6-voit single cell battery . Operation To record your message, just flip the playback/recordswitch to the "record" position , hold one of the message buttons down , and talk into the miniature electret microphone. As long as you hold down the messagebutlon, your voice wiII be recorded. If you want to record two messages, make sure you don't talk over eight seconds for each segment. Don't worry about filli ng up the whole eight seconds-the ISO1016 has a built-in End OfMessage (EOM) indicator that tells itwhen the endofeach message occurs . If you only record for 11,1,'0 seconds, your playback will end inexactly two seconds. Note that if you exceed eight seconds for message number one, the EOM signal will not work and you'll run over into message number two. If this happens, you'lljust have 10 try recording again. If you wa nt just one message (up 10 16 seconds long) , record it into message one and ignore Ihe message 11,1,'0 button . To play back your messages, flip the playback/record switch back to the playback posllion and hit the message button of your choice. When using the audio output todrive your HF or VHF rig , adjust potentiometers RI I and Rl2 (stan out with RI2 at the mid-range positon) for the best quality output from your transmitter. If Continued on page 61 MCN isa. Allow 3 wks for personal checks. Add $3 for COD . NC residents add 5% sales tax. JPS Communications, Inc. 5516 Old Wake Forest Road P.O. Box 97757 Raleigh, NC 27609 Circle 285 on reader service card. 12 73AmateurAadioToday - November. 1991 Figure 3. The P.C. board layout for the voice lD (copperfoil side),
, • ~M U' counter . $ • Don't W ait. This Offer Can't Last! Reg. Price, $ 259 • Full range -10Hz to 3GHz. • LCD display (daylight visibility). • True state-of-the-art technology with the high speed ASIC. • NiCads & Charger included. • Ultra-high sensitivity. • 4 gate times. • Extruded metal case. • Compatible with MFJ207. Suggested options TA100S: Telescoping Whip Antenna $ 12. CC30 Vinyl Carry Case $ 14. BL10: LED Backlight... $ 15. BL28: EI Backlight for use in roomlight and low light... $ 45. 8G28: Bargraph Signal Levellndicator. $100 . TCXO 30: Precision ±O.2ppm 20 to 40°C temp. compensated time base $1 00. Universal Handi Oounterw Model 3000. $375. and Bench Model 8030, $579. Both offer frequency, period, ratio and time interval. 5821 NE 14th Ave. • Ft. Lauderdale, FL 33334 5% Ship/Handling (Max. $10) U.S. & Canada. 15% outside continental U.S.A. Visa and Master Card accepted. _rl """"".'11""r ~ ."'......."'. •,"'•••~ Call for free catalog - Factory Direct Order Line: 1-800-327-5912 FL (305)nl-2050 • FAX (305)771-2052 CIRCLE 28 0,.. RU DER SERVICE CARD
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