Doppler RDF Antennas
Is anyone familiar with three-element quarter-wave or half-wave (Adcock)
Doppler antennas for RDF applications? These antennas are most commonly seen as four-element designs, but I'd like to build a three-element version that trades off directional accuracy for smaller size. I've come across articles on the Web stating that they *SHOULD* work, but I haven't found a reference to one that has actually been built. Thanks in advance. George K6GW |
there is a 2 element design on my web site that is extremely simple and
compact. http://www.k1ttt.net/technote/doppler.html "George" wrote in message link.net... Is anyone familiar with three-element quarter-wave or half-wave (Adcock) Doppler antennas for RDF applications? These antennas are most commonly seen as four-element designs, but I'd like to build a three-element version that trades off directional accuracy for smaller size. I've come across articles on the Web stating that they *SHOULD* work, but I haven't found a reference to one that has actually been built. Thanks in advance. George K6GW |
Nice and simple design, but as I understand it this design has 180 degree
ambiguity. Is that correct? George -- Email replies to: "Dave" wrote in message ... there is a 2 element design on my web site that is extremely simple and compact. http://www.k1ttt.net/technote/doppler.html "George" wrote in message link.net... Is anyone familiar with three-element quarter-wave or half-wave (Adcock) Doppler antennas for RDF applications? These antennas are most commonly seen as four-element designs, but I'd like to build a three-element version that trades off directional accuracy for smaller size. I've come across articles on the Web stating that they *SHOULD* work, but I haven't found a reference to one that has actually been built. Thanks in advance. George K6GW |
yes, the basic design is bidirectional. it has been a while since I played
with it, but I think you could design it for one frequency and get a cardioid pattern by spacing the antennas 1/4 wave apart and using feedlines that are 1/4 wave longer to one than the other. "George" wrote in message hlink.net... Nice and simple design, but as I understand it this design has 180 degree ambiguity. Is that correct? George -- Email replies to: "Dave" wrote in message ... there is a 2 element design on my web site that is extremely simple and compact. http://www.k1ttt.net/technote/doppler.html "George" wrote in message link.net... Is anyone familiar with three-element quarter-wave or half-wave (Adcock) Doppler antennas for RDF applications? These antennas are most commonly seen as four-element designs, but I'd like to build a three-element version that trades off directional accuracy for smaller size. I've come across articles on the Web stating that they *SHOULD* work, but I haven't found a reference to one that has actually been built. Thanks in advance. George K6GW |
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