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Antennas for emergency operations
Some time ago, I met an interesting character at a convention As a medical doctor, he was a medical missionary working at a relief station in Sudan Because of his unique business address, he was able to discuss mobile and portable antennas for communications from the boondocks His bona fides for this knowledge includes the fact that he is licensed to operate on both the amateur radio bands, and as a landmobile (or point-to-point) station in the 62-MHz band The desert where he travels is among the worst in the world The path they euphemistically call a road is occasionally littered with camel corpses because of the harsh conditions The doctor s organization requires him to check in twice daily on either 62 MHz or
486 Mobile, emergency, portable, and marine antennas 3885 MHz (which some missionary hams in Africa use as an unofficial calling frequency) If he misses two check-ins in a row, then the search and rescue planes are sent up As a result of his unique house calls, he does a lot of mobile and portable operating in the lower-HF region of the spectrum His problem is this: How do you reliably get through the QRM and tropical QRN with only 200 W PEP and a standard loaded mobile antenna Another fellow I once met works in Alaska for a government agency He faces many of the same problems as the doctor in Sudan, but at close to 100 colder He frequently takes his 100-W mobile rig into the boondocks with him in a four-wheel drive vehicle Again, with only 100 W into a poor-efficiency loaded mobile antenna, how does one reliably cut through the interference to be heard back at the homestead An earthquake, or hurricane, strikes your community Antenna towers collapse, tribanders become tangled masses of aluminum tubing, dipoles are snarled globs of no14 Copperweld, and the rig and linear amplifier are smashed under the rubble of one corner of your house All that remains is the 100-W HF rig in your car How do you reliably establish communications in kilowatt alley with a 100-W mobile driving a 75-W loaded whip Of course, you always got through one way or another before, but now communications are not for fun they are deadly serious Somehow, the distant problems of a Sudanese missionary doctor and a KL7 government forester don t seem too very far away For these operators, communications often means life or death for someone, perhaps themselves Given the inefficiency of the loaded whips typically used as mobile antennas in the low-HF region, the generally low power levels used in available mobile rigs, and the crowded band conditions on the 80-, 75-, and 40-m bands, it becomes a matter of more than academic interest how you might increase the signal strength from your portable (or mobile) emergency station Anything we can do, easily and cheaply, to improve the signal is like having money in the bank Fortunately, there are several tricks of the trade that will help us out in a pinch Figure 25-4 shows a typical mobile antenna for a low-HF band Because quarterwavelength antennas on these frequencies are 30 to 70 ft high, full-size vertical whip antennas are not practical In fact, at frequencies below 10 m, full-size whips are not generally used Short antennas exhibit capacitive reactance, so we add a loading coil (inductor L in Fig 25-4) to the radiator to make up the difference (its inductive reactance cancels the capacitive reactance of the antenna) The inductor in such a loaded antenna can be placed almost anywhere along the radiator, although base-, center-, and top-loaded designs predominate The actual inductance needed varies somewhat with coil placement, as does antenna performance The resonators used on commercial low-HF mobile antennas are loading coils encapsulated in a weathertight housing The mobile configuration is inefficient by its nature, and little can be done to improve matters Of course, an antenna-matching device or tuner will help in optimizing the power transfer to the antenna, and should always be used in any event (especially with solid-state final amplifiers, which don t tolerate VSWR as easily as do tube finals) In the portable configuration, however, we can both improve the performance of mobile antennas and look into antenna options not open to the mobile
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