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Schematic Diagram (46K GIF) · Complete Kit Instructions (440 PDF)
For detailed technical background see ALL ABOUT SPEECH PROCESSING.
BOOST YOUR CB RADIO
TALK POWER & RANGE
Blow Their Ears Off With DYNAMIC SPEECH PROCESSING!
Ever wonder why Rock 'N Roll radio stations always seem so loud? Or why TV commercials seem to be louder than the program itself? The reason is because smart broadcasters use exactly the same modulation processing thats now yours in this simple add-on device. You wont find this circuitry in the average radio; it would cost a lot more. And the sophisticated design requires too many parts to fit inside a power mike.
Your voice only modulates a transmitter about 30% on the average. So during a one-minute transmission, youre really only hitting full RF power output for about 20 seconds; the other 40 seconds are wasted energy. Heres why: almost all of the voice power is concentrated in the consonant sounds (B, K, S, etc.). The vowel sounds (A, E, I, O, U) contain very little average power and can cause high-intensity peaks which easily overmodulate a transmitter, causing channel splatter and "bleedover." Also, voice frequencies below 500 Hz and above 3000 Hz contain little power and dont really improve voice communications. With our DYNAMIC SPEECH PROCESSOR, the unwanted frequencies are reduced while at the same time the high intensity peaks are "clipped off." The scope photos show how the DSP effectively raises the average power relative to the peak power. The result is a dramatic increase in perceived loudness by the listener, to about 90% average modulation. Now youre running at your full potential RF power output almost all the time! And the best part is that proper adjustment of the DSP output eliminates overmodulation and channel bleedover while letting your voice punch through LOUD!FEATURES:
SOLD EITHER AS COMPLETE KIT OR AS PLANS + PC BOARD
CBC INTERNATIONAL · P.O. BOX 30655 · TUCSON AZ 85751 U.S.A.
TEL/FAX: 888-I-FIX-CBs (1-888-434-9227), (520) 298-7980
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