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- AUGUST NEWS LETTERISOTRON 20 A WORK HORSE FOR 20 METERS This article will also appear on our web site. IMPROVING THE AUDIO QUALITY OF YOUR STATION. - PART 1 We have two audio qualities to consider. What you receive and what you transmit. Reception has its challenges. Depending on your location and antenna installation, determines the amount of unwanted noise you will receive. Atmospheric noise is received through much of the HF spectrum. However, it gets quite high at the lower frequencies, 40, 80 and 160 meters. This noise will sound more like a hiss than a crackling. Lightening sounds more like a crackling or snap. It will be more steady with a smooth fluctuation. If you have other noises over riding the atmospheric noise, then it will have to be addressed. The first place to start is with the receiving antenna. A resonant dipole or vertical will maximize noise. It will also maximize the received signal. Height above ground and position of the antenna will affect the noise reception. Dipoles normally slightly quieter than verticals, but not always. The end or tips of these two antennas are affected mostly by noise. This is normally where the RF voltage is highest. This makes this part of the antenna more sensitive to its surroundings, including noise. If you are in to experimenting with antennas, you can find which antenna has the least noise, what position and height will offer the same. However, that is a lot of work and many have little choice where to put their antenna. One good option is a receiving loop. You can build these quite easily. There are wire loops, coaxial loops and ferrite loops. It can be made uni-directional or bi-directional. For it to be most affective, the wire and coaxial loops particularly should be outdoors and rotatable. The ferrite loops are more forgiving and may be used indoors. The ferrite actually bend the flux lines of the signals in the air, enhancing reception. An amplifier is a nice addition to the receiving loops. However, many receivers have preamps that may be sufficient. Rotating the antenna will isolate the signal to a degree that you want to listen to. It will also give you an idea of your noise location. The more you invest into a receiving antenna, the better your reception will be. These are small and easy to construct. You can find various designs in the antenna and other handbooks available. The antenna is not the only place to work on noise. Also atmospheric noise is not the only one we have to deal with. Future articles will address this problem. 73, Ralph WD0EJA 03-18 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. IF YOU DESIRE NOT TO BE CONTACTED PLEASE EMAIL YOUR REQUEST. |
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