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Field Day is a reasonably good training ground for people who anticipate operating radio equipment under primitive conditions If you pay attention to the sometimes humorous foul-ups seen while getting on the air from atop High Peak Mountain in Goose Bump National Park, then you might avoid some of the same mistakes when foul-ups mean more than a quick drive to the nearest town You will learn, for example, which simple tools are a must for constructing and repairing simple antennas (including the 12-Vdc soldering iron that runs off the vehicle battery) You will also learn a bit about electricity needed to run the rig Two alternatives present themselves First, you could use 12 Vdc from the vehicle electrical system, which makes sense with the current crop of 12 Vdc HF rigs on the market Or, you could operate from 120 Vac generated by a light plant generator When boondocking in a four-wheeler (or other vehicle), it is wise to use a dual battery system such as shown in Fig 25-9 Two separate 12-Vdc auto batteries (preferably high ampere-hour capacity) are connected essentially in parallel with the alternative charging system Diodes D1 and D2 are rated at 100 A, 50 V peak inverse voltage (PVI), and are used to isolate the two batteries from each other Diode assemblies such as this can be built, or purchased from van conversion and recreational
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494 Mobile, emergency, portable, and marine antennas
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vehicle shops Van and RV owners use is the same as yours: It s a darn shame to run down the battery needed to start the vehicle just by operating your rig You not only cannot start the vehicle in such a case, but cannot muster enough power to call for the wilderness equivalent of Triple A One experienced boondocker I met in southern Arizona totes either a 450-W Kawasaki or 500-W Honda mini light plant generator in the back of his Bronco These models are surprisingly lightweight and quiet operating One of the generators has a 12-Vdc, 8-A outlet that can be used to charge a dead battery The other has only the 110-Vac outlet, but can be used for battery charging if a small charger is provided Simple 10-A battery chargers can usually be bought at auto parts or accessories stores, for about $60 Operating radio communications equipment successfully under primitive conditions depends upon two major factors: available electrical power and a proper, efficient, antenna system Although dealing in detail with the means of obtaining power in remote locations is beyond the scope of this book, we have provided some ideas from which you can start planning your own survival radio system
Marine radio antennas
Radio communications considerably lessened the dangers inherent in sea travel So much so, in fact, that the maritime industry took to the new wireless telegraphy earlier than any other segment of society In the early days of radio, a number of exciting rescues occurred because of wireless Even the infamous SS Titanic sinking might have cost less human life if the wireless operator aboard a nearby ship had
Marine radio antennas 495 been on duty Today, shore stations and ships maintain 24-hour surveillance, and vessels can be equipped with autoalarm devices to wake up those who are not on duty Even small pleasure boats are now equipped with radio communications, and these are monitored around the clock by the US Coast Guard The small shipboard operator can have a selection of either HF single-sideband communications or VHF-FM communications The general rule is that a station must have the VHF-FM, and can be licensed for the HF SSB mode only if VHF-FM is also aboard The VHF-FM radio is used in coastal waters, inland waters, and harbors These radios are equipped with a high/low power switch that permits the use of low power (1 W typically) in the harbor, but higher power when under way The HF SSB radios are more powerful (100 W typically), and are used for offshore long-distance communications beyond the line-of-radio-sight capability of the VHF-FM band The problems of antennas on boats are the same as for shore installations, but are aggravated by certain factors Space, for one thing, is less on a boat so most HF antennas must be compensation types Also, grounds are harder to come by on a fiberglass or wooden boat, so external grounds must be provided A typical powerboat example is shown in Fig 25-10 The radio is connected to a whip antenna through a transmission line (and a tuner on HF), while also being grounded to an externally provided groundplate Over the years, radio grounds have taken a lot of different forms For example, the ground might be copper or aluminum foil cemented to the boat hull Alternatively, it might be a bronze plate or hollow bronze tube along the center line of the boat, or along the sides just below the water line The ground will also be connected to the engine Careful attention must be paid
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