[CDATA[ I’ve tried this method using an inexpensive transistor radio, and the accuracy is astonishingly good. The antenna is very directional, and produces a sharp null when the length of the antenna is pointed directly at the station. // ]]> google_ad_client = "ca-pub-6978071804428200"; google_ad_slot = "5806038737"; google_ad_width = 300; google_ad_height = 250; All you need is an AM radio and a good map marked with the locations of local broadcast stations. Radio Direction Finding PA8W Radio Direction Finding What’s a (pseudo-) Doppler RDF Accuracy of a pseudo DRDF Builds by other RDF Array builds by PD0G RDF projecten RDF 2.3 Version 2.3 Doppler RDF Partslist V2.3 The ferrite core antenna coil is mounted parallel to one of the sides of the case of the radio. Fortunately, the vast majority of inexpensive radios were also built this way. The exact location of a radio station’s transmitter (which might be different from its city of license or studio location) can be looked up at the FCC website. // ]]> Your email address will not be published. It’s possible that some of them moved their transmitter site without telling the FCC, or possibly that station’s signal is being reflected by some nearby object. – Display results in a real-time In an urban area, I can generally find my location within a few hundred yards. The point on the map where the two lines intersect is your location. Sixty years ago this month, the June 1958 issue of Radio Electronics carried the plans for this transistorized radio compass. Of course, a GPS receiver will give more accurate results much more easily. I’ve found that a few of the local broadcast stations seem to give an inaccurate bearing. The article specified that it was a worthwhile investiment for “people interested in outdoor activities such as motorboating, sailing, hunting, trapping, berry picking, camping, hiking or other activity where there is a possibility of getting lost.”. Connections for the direction finding antenna DC power connections Radio modem channel switch (optional) Ethernet connection Audio output Auxiliary audio input Laptop power (20 Vdc) Data radio antenna connection Power and //
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