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Copyright 2001 - the McGraw-Hill Companies
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340 VHF/UHF transmitting and receiving antennas Another point to make is that many of the mechanical chores of antenna design and construction become easier for VHF/UHF antennas One good example is the delta impedance-matching scheme At 80 m, the delta-match dimensions are approximately 36 43 ft, and at 2 m they are 95 12 inches Clearly, delta matching is a bit more practical for most users at VHF than at HF
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Types of antennas usable for VHF/UHF
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The concept VHF/UHF antenna is only partially valid because virtually all forms of antenna can be used at HF, MW, and VHF/UHF The main limitations that distinguish supposedly VHF/UHF designs from others are mechanical: there are some things that are simply much easier to accomplish with small antennas Besides the delta match mentioned previously, there is the ease of construction for multielement antennas A 14-element 20-m beam would be a wonderful thing to have in a QRM-laden DX pile-up, but is simply too impractical for all but a few users because of its size If you look on embassy rooftops around the world you will see manyelement Yagi and log periodic HF antennas supported on massive towers and some of them use a standard Size 25 tower (common for amateur use) as the antenna boom! A 14-element 80/75-m Yagi approaches impossibility But at 2 m, a 14-element Yagi beam antenna can be carried by one person, in one hand, unless the wind is acting up Safety note Large array beams, even at VHF/UHF, have a relatively high windsail area, and even relatively modest winds can apply a lot of force to them I once witnessed a large, strong technician blown off a ladder by wind acting on a modest, suburban sized, TV antenna It can happen to you, too So always install antennas with a helper, and use hoists and other tools to actually handle the array
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Between 1958 and 1962, a friend and I had access to a radio club amateur radio station in a Red Cross chapter house in Virginia The antenna farm consisted of a 14element 2-m beam, a three-element triband HF beam (10, 15, and 20 m), and a five-band (80 to 10 m) trap dipole All of the coaxial cables came into the station through a wall; they were kept disconnected and shorted out when not in use because of the senior Red Cross official s concern over lightning One night, attempting to connect the 2-m beam to the Gonset gooney box 2-m AM transceiver, my friend accidentally used the cable from the five-band trap dipole instead We worked a lot of stations that contest weekend, and scored lots of points Later, we discovered the error, and asked a more technically competent adult (we were teenagers), Why the good reports He then gave us a lesson in longwire antenna theory A good longwire is many wavelengths long Consider that a half-wave antenna on 2 m is 80 m/2 m or 40 wavelengths shorter than an 80-m half-wave antenna Thus, the 80-m antenna, counting foreshortening of physical lengths because of the traps, was on the order of 35 to 38 wavelengths long on 2 m We had a highly directional, but multilobed, pattern
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VHF/UHF antenna impedance matching 341 Similarly, 40- to 10-m and 80- to 10-m trap verticals are often usable on VHF/UHF frequencies without any adjustments Similarly, Citizens Band 11-m antennas, many of which are 5 8-wavelength (18 ft high), will sometimes work on VHF frequencies Check the VSWR of an HF antenna on 2 m with a reliable VHF/UHF VSWR meter (or RF wattmeter) to discover the truth about any particular antenna Always use the low-power setting on the transmitter to limit damage in cases where the specific antenna is not usable on a specific frequency The lesson to be learned is that antennas are often usable on frequencies much higher than the design frequency, even though useless on nearby bands Care must be exercised when initially checking out the antenna, but that is not an inordinate difficulty
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