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Most readers will use a loop for DXing rather than hidden transmitter hunting, navigation, or other RDF purposes For the DXer, there are actually two uses for the
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loop One is when you are a renter or live in a community that has routine covenants against outdoor antennas In this situation, the loop will serve as an active antenna for receiving AM BCB and other low-frequency signals without the neighbors or landlord becoming PFJs ( purple-faced jerks ) The other use is illustrated by the case of a friend of mine He regularly tunes in clear channel WSM (650 kHz, Nashville) in the wee hours between Saturday evening ( Grand Ole Opry time) and dawn However, this clear channel of WSM is not really so clear, especially without a narrow filter in the receiver He uses a loop antenna to null out a nearby 630-kHz signal that made listening a bit dicey and can now tape his 1940s 1950s vintage country music It is not necessary to place the desired station directly in the main lobes off the ends of the antenna but rather to place the nulls (broadside) in the direction of the
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Loop amplifier 313 offending station that you want to eliminate So what happens if the offending station and the desired station are in a direct line with each other and your receiving location is in the middle between them Both nulls and lobes on a loop antenna are bidirectional, so a null on the offending station also will null the desired station in the opposite direction One method is to use a sense antenna to spoil the pattern of the loop to a cardioid shape Another method is to use a spoiler loop to null the undesired signal The spoiler loop is a large box loop placed 1 to 3 ft (found experimentally) behind the reception loop in the direction of the offending signal This method was first described by Levintow and is detailed in Fig 15-10 The small loopstick may be the antenna inside the receiver, whereas the large loop is a box loop such as the sports fan s loop The large box loop is placed about 33 to 100 cm behind the loopstick and in the direction of the offending station The angle with respect to the line of centers should be 60 to 90 , which also was found experimentally It is also possible to use two air core loops to produce an asymmetrical receiving pattern
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Many years ago, the Q-multiplier was a popular add-on accessory for a communications receiver These devices were sold as Heathkits, and many construction projects could be found in magazines and amateur radio books The Q-multiplier has the effect of seeming to greatly increase the sensitivity of a receiver, as well as greatly reducing the bandwidth of the front end Thus it allows better reception of some stations because of increased sensitivity and narrowed bandwidth A Q-multiplier is an active electronic circuit placed at the antenna input of a receiver It is essentially an Armstrong oscillator, as shown in Fig 15-11, that does not quite oscillate These circuits have a tuned circuit (L1/C1) at the input of an amplifier stage and a feedback coupling loop (L3) The degree of feedback is controlled by the coupling between L1 and L3 The coupling is varied by varying both how close the two coils are and their relative orientation with respect to each other Certain other circuits use a series potentiometer in the L3 side that controls the amount of feedback The Q-multiplier is adjusted to the point that the circuit is just on the verge of oscillating, but not quite As the feedback is backed away from the threshold of oscillation, but not too far, the narrowing of bandwidth occurs, as does the increase in sensitivity It takes some skill to operate a Q-multiplier, but it is easy to use once you get the hang of it and is a terrific accessory for any loop antenna
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