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-SEPTEMBER NEWS LETTERISOTRON 80/40 COMBINATION OUR MOST POPULAR UNIT! THE BEST WAY TO OPERATE HF EASY INSTALLATION EXCELLENT PERFORMANCE DURABLE CONSTRUCTION CC&R FRIENDLY (XYL ALSO)IMPROVING THE AUDIO QUALITY OF YOUR STATION. - PART 2 The last article gave suggestions on noise at the antenna end. What can be done at the radio to improve reception? Start with the speaker and audio circuit of the radio. Even the high end radios can be lacking in this area. How so? Most radios come with a low power audio amplifier. It is driving a small speaker that may not have a high acoustic quality. I have heard it estimated that even the high end receivers has as much as 8% distortion. Now comes the fun part. Rather than listen to your receiver with the stock audio system, add a relatively high power amplifier. This is not for the purpose of blasting your ears off, but to amplify the receiver audio with little distortion. Also, adding a good quality speaker is needed. Most amps will have a base and treble control. Some will have an equalizer and others will have a full blown Digital Signal Processor (DSP). Which ever you use, it will be helpful. You can adjust the base and treble, or the equalizer between 300 and 3,000 cycles per second response. Also, customize it a little to your ears. By doing this, you will find that the unwanted noise will start to take a back seat. The DSP unit will be able to adjust the audio in minute detail. Even notching out narrow areas of the spectrum. The frequency response can be made sharper. If you are having a bit of hearing loss, you can customize the DSP for what you need. Have you tried a good set of head phones. Not the ear wax diggers, but the full size ones that block out your surrounding noise. It also is a big improvement. Adding this simple feature is easy and will improve the best receivers. There is more you can do with the radio itself. This will be covered in up coming articles. 73, Ralph WD0EJA 04-18 BILAL COMPANY 137 MANCHESTER DR. FLORISSANT, CO. 80816 U.S.A PH/FX: 719/687-0650 OUR EMAIL LIST IS ACQUIRED BY PERSONS WHO HAVE CONTACTED US IN THE PAST. PHOTO WAS TAKEN 10 MILES SW OF FLORISSANT, CO. IF YOU DESIRE NOT TO BE CONTACTED PLEASE EMAIL YOUR REQUEST. |
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