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13-1A Omnidirectional antenna picks up cochannel interfering signals equally well
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274 Antennas for shortwave reception possible The idea here is to place the unwanted signal (S2) into the notch in order to make it considerably weaker Note that the notch is sharper than the peak of the main lobe If the dipole is placed on a mast, with an antenna rotator, this ability is increased even more Another antenna parameter, of considerable interest, is angle of radiation a, which (by reciprocity) also means angle of reception Because HF propagation over long distances is created by skip phenomena, the angle at which the signal hits the ionosphere becomes extremely important Figure 13-2 shows two situations from the same station Signal S1 has a high angle of radiation (a1), so its skip distance (D1) is relatively short On signal S2, however, the angle of radiation (a2) is low, so the skip distance (D2) is much longer than D1 So which situation do you want in your antenna The impulsive answer would be the long distance angle of radiation (a 2), but that is often wrong The correct answer is: It depends! The desired angle of radiation is a function of whether you want to receive a station from point A or point B The angle of radiation of the antenna is fixed by its design, that is, by antenna physics The desired angle is a function of the ionospheric properties at the time of interest, and the operating frequency For this reason, some well-equipped radio hobbyists have several antennas, of differing properties, to enhance their listening
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It s simply too naive to state, I suppose, but let s do it anyway: An antenna must be properly connected to the receiver before it can be effective If your antenna uses coaxial cable, and the receiver accepts coax, then no discussion is needed: Attach
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13-2 Skip phenomena dependence on angle of radiation
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Connection to the receiver 275 the proper coax connector and plug in But in other cases, non-coaxial-cable antennas are used There are two major forms of antenna input connector used on shortwave receivers One form uses two (or three) screws intended for either wrapped wire leads or spade lugs, while the other is one or more varieties of coaxial connector This section covers how each type is connected to a single-wire antenna lead-in Consider first the screw-type connector (Fig 13-3A) Depending upon the design, there will be either two or three screws If only two screws are found, then one is for the antenna wire and the other is for the ground wire These screws will be marked something like A/G or ANT/GND, or with the schematic symbols for antenna and ground Three-screw designs are intended to accommodate balanced transmission lines such as twin lead, or parallel ladder line Shortwave listeners can sometimes use ordinary ac line cord (called zipcord) as an antenna transmission line Zipcord has an impedance that approximates the 75- impedance of a dipole When parallel lines of any type are used, connect one lead to A1 and the other to A2 Of course, the ground terminal (G) is connected to the earth ground For single-lead antenna lines connect a jumper wire or bar (ie, a short piece of bare no 22 solid hookup wire) between A2 and G This jumper converts the balanced input line to unbalanced The A2/G terminal is connected to earth ground, while A1 is connected to the single-lead antenna wire
A1 Antenna wire
Jumper
13-3A Connection of wire antenna to balanced antenna terminals on receiver
276 Antennas for shortwave reception On receivers that use an SO-239 coaxial connector, we can use either of two techniques to connect a single-lead wire First, we can obtain the mating PL-259 plug, and solder the antenna lead to the center conductor pin The PL-259 connector is then screwed into the mating SO-239 chassis connector Regardless of the type of coaxial connector, however, the mate can be used for the antenna lead wire But for SO-239 connectors another alternative is also available Figure 13-3B shows a banana plug attached to the lead wire and inserted into the receptacle of the SO-239
DANGER!
Certain low-cost receivers, especially older vacuum-tube models, have a so-called ac/dc or transformerless internal dc power supply On most receivers, the dc common is the chassis, which also serves as the RF signal common But on ac/dc models the neutral wire of the ac power line serves as the dc common, and it is kept floating as a counterpoise ground above the chassis ground used by the RF signals A capacitor (C1 in Fig 13-4) sets the chassis and counterpoise ground at 0V RF potential, while keeping the counterpoise isolated for dc and 60 Hz ac A danger exists if either the ac plug is installed backwards or someone plugs the socket in the wall incorrectly (often happens!) Even if C1 is intact, a nasty shock can be felt by touching the antenna ground (G or GND) terminal The capacitive reactance of C1 is about 27 M for 60-Hz ac, so at least a bite is going to happen But if that capacitor is shorted, which is likely on older receivers, then the bite is considerably worse, and might even prove fatal The problem, in that case, is that reversed ac line polarity will set the hot line from the ac socket on the ground lead The least to expect is massive fireworks and a possible fire hazard; the most to expect is a fire, and your possible electrocution The usual advice given to owners of such radios is to make sure that C1 is intact before using the radio I prefer a better solution: buy, install, and use a 120:120 Vac isolation transformer to isolate your receiver from the ac power lines Such a transformer is standard practice in repair shops, and it should also be standard practice in your house
SO-239
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