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Adf Loop
How does an automatic direction finder (ADF) work? How small can you make one?
ADF's have been used for decades as navigational aids in aircraft, receiving signals from non-directional beacons. I am surprised that they are not using these in small robots for navigation (e.g., Roomba). My question is: How do ADF's work? (I know it involves something called a sense-loop antenna...) Also, is there a size limitation that makes them unsuitable for small robots?
ADF's detect an electric field and a magnetic field which are perpendicular in space and their amplitudes vary sinusoidally with time. The magnetic field induces a voltage into the windings of the ADF loop antenna. By measuring the phase difference between the windings the ADF is able to determine the direction of the beacon.
Putting beacons around the house and using ADF to navigate turns out to be expensive and inefficient as GPS and proximity sensors are available and work better.
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Narco ADF 31 Loop cable |  |
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US $128.00 | 1d 21h |
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Narco ADF Loop Cable for 29, 30/A | |
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US $128.00 | 7d 18h 46m |
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522-2301-005, Collins 137A-4 Aircraft ADF Loop Antenna | |
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US $499.99 | 4d 2h 13m |
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Vintage F-86 Sabre AS-313B/ARN-6 ADF Loop Antenna | |
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US $149.99 | 10d 2h 32m |
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King KA42 ADF Loop Antenna with connector | |
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US $89.00 | 11d 12h 6m |
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Kett ADF Loop antenna Polaris | |
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US $128.00 | 11d 14h 49m |
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Narcomatic Vintage Narco Avionics ADF Loop Antenna | |
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US $89.99 | 12d 2h 39m |
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KING KA 42A ADF LOOP ANTENNA P/N 071-1098-00 | |
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US $135.99 | 12d 21h 32m |
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King KA-42B ADF Loop & Sense Antenna, 071-1133-00 | |
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US $269.99 | 13d 3h 3m |
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ADF Loop Antenna | |
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US $124.99 | 16d 14h 3m |
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NARCO NARCOmatic Sensor ADF 29 Loop Antenna | |
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US $128.00 | 18d 1h 51m |
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ANTENNA KING KA42A ADF LOOP AIRCRAFT AVIONICS | |
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US $75.00 | 19d 17h 8m |
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King KA42 ADF Loop Antenna KR85 KR86 Cessna Piper Beech Avionics | |
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US $30.00 | 21d 21h 52m |
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41000-1000, ARC / Cessna L-346A ADF Loop Antenna | |
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US $59.99 | 22d 1h 23m |
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KING KA 36 ADF LOOP ANTENNA P/N 071-1034-00 | |
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US $179.99 | 20d 15h 56m |
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Transdyne ADF Loop Box for Bench Testing | |
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US $868.00 | 15d 13h 20m |
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Narco ADF 140, 141 and 200 Loop cable | |
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US $128.00 | 26d 17h 43m |
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ANTENNA KING KA42 ADF LOOP AIRCRAFT AVIONICS | |
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US $100.00 | 27d 20h 54m |
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Avionics Antenna Bendix/King KA44B ADF Loop/Sense | |
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US $2,176.00 | 6d 11h 24m |
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Narco Loop Antenna ADF-140 | |
0 Bid | US $5.00 | 13h 36m |
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Adf Asm $110.99 ADF ASM |
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3460 ADF MNT KIT $139.99 3460 ADF MNT KIT |
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MOBILEOFFICE AD450 ADF 600DPI $279.99 MOBILEOFFICE AD450 ADF 600DPI |
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ADF PAD ASSY SHTFDR $56.99 ADF PAD ASSY SHTFDR |
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ADF PAD ASSY FLATBED $56.99 ADF PAD ASSY FLATBED |
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Kit,Adf Maint,X65x $98.99 MAINT KIT ADF |
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Adf Pad Assy Flatbed $54.99 ADF PAD ASSY FLATBED |
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Adf Pad Departmental $57.99 ADF PAD DEPARTMENTAL |
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Adf Pad Dt Series $54.99 ADF PAD DT SERIES |
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Adf Pad Assy Shtfdr $52.99 ADF PAD ASSY SHTFDR |
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asdf $1 adf |
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MNT KIT FOR XEROX 3220 ADF $92.99 MNT KIT FOR XEROX 3220 ADF |
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Lexmark ADF Maintenance Kit 40X5807 $58.81 Lexmark ADF Maintenance Kit 40X5807 |
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HP CB414-67919 ADF Assembly CB41467919 $314.85 HP CB414-67919 ADF Assembly CB41467919 |
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HP PF2288-SVPNR ADF Assembly PF2288SVPNR $499.35 HP PF2288-SVPNR ADF Assembly PF2288SVPNR |
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Lexmark ADF Pick Pad 40X5189 $16.56 Lexmark ADF Pick Pad 40X5189 |
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Lexmark ADF Separator Pad 40X5187 $21.37 Lexmark ADF Separator Pad 40X5187 |
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Lexmark 40X0450 Complete ADF Assembly $891.02 Lexmark 40X0450 Complete ADF Assembly |
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Type 500 Adf Maintenance Kit $42.99 TYPE 500 ADF MAINTENANCE KIT |
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Q5997A ADF Maintenance Kit(Pack of 1) $243.99 Q5997A Adf Maintenance Kit |
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Tags: adf loop, adf loop antenna, adf loop sense antenna, art, design, flash, music, wii