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The antennas used by scanner listeners are widely varied, and (in some cases) overpriced Although it is arguable that a total coverage VHF/UHF antenna is worth the money, and it probably is, there are other possibilities that should be considered First, don t overlook the use of television antennas for scanner monitoring! The television bands (about 80 channels from 54 MHz to around 800 MHz) encompass most of the ordinarily used scanner frequencies Although antenna performance is not optimized for the scanner frequencies, it is also not zero on those frequencies If you already have an all channel TV antenna installed, then it is a simple matter to connect the antenna to the scanner receiver (Note: if the antenna uses 300- twin lead, then install a 4:1 balun transformer that accepts 300 in and produces 75 out These transformers are usually available at TV shops, video shops including videotape rental places and Radio Shack stores) The directional characteristic of the TV antenna makes it both an advantage and a disadvantage to the scanner user If the antenna has a rotator, then there is no problem Just rotate the antenna to the direction of interest However, if the antenna is fixed, and the station of interest is elsewhere than where the antenna is pointed, then there is a bit of a problem Nevertheless, some reception is possible for at least three reasons One is that the main beam of the antenna is not infinitely thin, so the station of interest might well be within the beam even if off the point a little bit Second, there are always sidelobes on an antenna These are areas outside of the main beam that offer reduced, but nonzero, reception characteristics Finally, the sidelobes and main lobe of the antenna are optimized for the TV bands, and may not obtain the same directivity on certain scanner frequencies It is, therefore, possible that a TV antenna will have an unusual lobe in the direction of interest for the scanner channel
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VHF/UHF scanner band antennas 361 The TV antenna also offers other possibilities The hardware and electronics, normally found useful on TV antenna systems, are also useful for scanner antennas The use of the mounting hardware is obvious, but less obvious is the use of components such as multiset couplers, impedance transformers, and wideband amplifiers For example, Fig 18-14 shows two scanner antennas joined together into a single
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18-14 Combining two antennas with TV hardware
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362 VHF/UHF transmitting and receiving antennas transmission line using a two-set coupler Although intended to allow two television sets to receive a signal from the same antenna, the device also works to combine two antennas into a single transmission line Two popular TV uses include two antennas for different directions and VHF and UHF antennas that share the same downlead Be sure to buy a weatherproof model if you intend to mount the coupler on the antenna mast (the correct place for it) (Fig 18-15) TV antenna amplifiers are used to increase the weak signal from a distant station to a level compatible with the TV receiver Because these amplifiers are wideband designs, they will also work well for the scanner bands that are inclusive within the 54- to 800-MHz TV bands Some models are intended to be part of the antenna, while others are mounted indoors, some distance from the antenna The basic rule of thumb is to place the amplifier as close as possible to the head end of the system where the antenna is located This situation will permit signals to be built up to a level considerably above the noise level before being attenuated in the transmission line losses TV/FM receiver folded dipoles made of twin-lead transmission line also work well at other VHF/UHF frequencies Figures 18-16A and 18-16B show the details of their construction
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