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Once the tuning range is set, the RF input stage must be peaked for best sensitivity This can be done using a signal generator, or on-the-air signals Find an alignment tool or jeweler s screwdriver that fits trimmer capacitor C18 Use one of the following three methods to peak C18 1 Using a signal generator, peak C18 for best sensitivity Reduce the signal generator output, or reduce the R1 Gain control setting, to prevent overload as C18 is brought into resonance 2 Using off-air signals, adjust C18 until signals are loudest Reduce the R1 Gain control as C18 is
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brought into resonance to prevent overload Verify that C18 is properly peaked while monitoring a known on-air signal 3 With an outside antenna connected, peak C18 for maximum atmospheric noise in the headphones or speaker Verify that C18 is properly peaked while monitoring a known on-air signal
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control at R1 for a comfortable listening level Then, carefully adjust the tuning control until the beat note, or tone, sounds best for you Most experienced CW operators prefer a lower beat note of about 300 or 400 Hz When trying to tune-in single-side band (SSB) stations, you may need a little practice to tune-in the signal properly Direct conversion receivers offer no upper or lower sideband rejection, so you will have to slowly tune across the SSB signal until the voices become natural sounding Use the gain control to prevent overload and to set a comfortable listening level In order to tune-in AM stations, you will need to realize that, unlike SSB signals, AM signals have a carrier frequency That means you will hear a beat note as you tune across an AM signal Tune the signal so the beat note becomes lower in frequency and stop when zero beat (beat note disappears) is reached
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With your new receiver completed and aligned, you can attach a dipole antenna for the chosen band of operation Direct conversion receivers need good antennas Using a random length of wire will give poor results Half-wave dipoles are very effective antennas and are simple to construct For low-power or QRP work, or for receive only applications, low-cost RG-58 52 ohm coax is fine The formula for dipole antennas: 234/(frequency in MHz) = 1 4-wavelength in feet will give the length of wire needed for each leg of the dipole For example, if you wanted to build a 40-meter dipole for the CW portion of the band you would divide 234 by 7040 MHz and the result would be 33238 feet per leg on either side of the center insulator: see Figure 9-4
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An unfortunate fact of life is that low-power amateur signals are surrounded by high-power SW broadcast signals, so there may be a possibility of overload problems In order to compensate for this possible problem, you may need to lower the gain control Simply lowering the gain setting will resolve many overload problems Another approach to an overload problem is to use a preselector A preselector provides protection from strong out-of-band signals They are most effective when the interfering signal is far from the operating frequency A resonant antenna favors signals in the band it was cut for, so when faced with a severe overload problem, you elect to use a resonant antenna The final approach to solving an overload problem is to change the direction the dipole faces; this may lower unwanted pickup of undesired SW signals Lowering the antenna will change its angle of pickup; a low antenna may favor local stations over the low-angle of distant broadcast signals A shorter antenna can also be tried; it will be less efficient and signals will be weaker
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