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23-5 AM portable radio Dark bar represents position and direction of internal loopstick
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Regular wire loop antennas (Fig 23-6) are also used for radio direction finding In fact, in some cases the regular loop is preferred over the loopstick The regular loop antenna may be square (as shown), circular, or any other regular n-gon (eg, hexagon), although for practical reasons the square is easier to build The loop has pretty decent inductance even with only a few turns One loop I built was 24 in square (A in Fig 23-6) and had, if I recall correctly, about 10 turns of wire spaced over a 1-in width (B in Fig 23-6) It resonated to the AM BCB with a standard 365pF broadcast variable capacitor When you use a regular loop antenna be aware that the antenna has a figure-8 pattern like the loopstick, but it is oriented 90 out of phase with the loopstick antenna In the regular loop the minima (nulls) are perpendicular to the plane of the loop, while the maxima are off the sides In Fig 23-6 the minima are in and out of the page, while the maxima are left and right (or top and bottom)
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An activity popular with ham radio operators in the 1960s was fox hunting A fiendishly clever ham (the fox ) would go hide with a mobile or portable transmitter (usually on either 10 or 75 m) The hunters would then RDF the fox s brief transmissions and try to locate the transmitter If you could locate the antenna, you located the station (according to the most common set of rules) Sometimes the hunt got a little wild as hunters raced each other (a no-no) in the final stretch One friend of mine had an interesting experience He drove a 1949 Plymouth that was painted hideous dark green with fire-engine-red hub caps It looked just plain awful (especially since the paint looked like it was put on with a whisk broom!) He used a Gonset converter linked to the AM BCB receiver installed in the car The antenna was a wire loop on the end of a broom handle, similar to Fig 23-7 The antenna was mounted about where you would expect the left-side rear view mirror to be located He could reach his hand out the window and rotate the antenna while listening for the minima on the receiver Worked rather well, and he won some fox hunts The fox hunts in his area were usually held on Saturday or Sunday morning, and after it was all over the whole crew would get to a restaurant for brunch or beer or something One morning, however, my buddy with the hideous green car was racing down a residential street to be the first to the transmitter Others were in the area, and the end game was in motion Unfortunately, a little old lady called the police complaining about a nut racing up and down the street in a strange car waving a cross out the window Breakfast had to wait that morning, I bet
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Radio direction finding is most accurate over relatively short distances If you can use the ground wave, then all the better (which is what you use during daylight hours for nearly all AM BCB stations) Skip rolls in on the AM BCB after local
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23-7 waving a cross out the window antenna
446 Antennas for radio direction finding (RDF) sundown, so you can hear all manner of stations all up and down the dial You can RDF distant stations Some rather interesting sites have turned up when SWL DXers RDF ed some of the infamous numbers stations Those stations transmit either CW or voice numbers groups, and are believed to be sending messages to spies around the world RDFing by DXers has located some of these transmitters at, well, interesting sites Unfortunately, there are some problems with skip RDFing When we look at propagation drawings of skip in textbooks we usually see a one plane view The curvature of the earth shows, as does the transmitter and receiver site A pencil beam radio signal travels at some angle up the ionosphere, where it is reflected (actually, it s a refraction phenomenon but looks like reflection to an observer on the surface) back to earth We can tell from the drawing that the angle of incidence equals the angle of reflection, just like they told us in high school science classes Oops! The real world is not so neat and crisp, however In the real world the wave might encounter a different ionization density along its path of travel and therefore be deflected from its original path It might return to earth at a location offset from the direction it appears If we look at the true bearing from the receiver site to the transmitter site, and then note the azimuthal angle of arrival of the signal, we note that something is amiss Actual reflection also causes some problems, especially when RDFing a station in the high end of the HF band or the VHF/UHF bands Radio waves will reflect from geological features such as mountains, as well as man-made structures (eg, buildings) If the reflection is strong enough it might appear to be the real signal, and cause a severe error in RDFing Be wary of RDF results when the skip is in
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