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#1
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are RDF's still usable in todays world. radio direction finding???
just wondering if they are still usable in the waters around the us
and in other countries?? thanx for any/all input |
#2
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Their still common equipment on high end sportfishing boats and
commercial fishing boats, to home in on the location of other boats. Other than that their only useful for rescue work. |
#3
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I use an ARN-6. Works well, but you may have to account for the
shoreline effect. http://www.radio-locator.com/ and others will give you the lat and long. Regards, Harry Capt John wrote: Their still common equipment on high end sportfishing boats and commercial fishing boats, to home in on the location of other boats. Other than that their only useful for rescue work. |
#4
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Capt John wrote:
Their still common equipment on high end sportfishing boats and commercial fishing boats, to home in on the location of other boats. Other than that their only useful for rescue work. Are you referring to _VHF_ homing devices? My impression was that the original poster was interested in RDF's, which operate on quite different frequencies. They are still common in many parts of the world. -- Good luck and good sailing. s/v Kerry Deare of Barnegat http://home.comcast.net/~kerrydeare |
#6
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Not VHF. I referred to the LF beacons and AM Broadcast Band. You can
find the location of the AM radio station's antenna in one of various databases and home in on that. The VHF ADFs are very expensive. Regards, Harry Armond Perretta wrote: Capt John wrote: Their still common equipment on high end sportfishing boats and commercial fishing boats, to home in on the location of other boats. Other than that their only useful for rescue work. Are you referring to _VHF_ homing devices? My impression was that the original poster was interested in RDF's, which operate on quite different frequencies. They are still common in many parts of the world. -- Good luck and good sailing. s/v Kerry Deare of Barnegat http://home.comcast.net/~kerrydeare |
#7
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I believe that the nav beacons are still in service and are used to
transmit GPS WAAS corrections. I may be wrong. Regards, Harry |
#8
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Are you referring to _VHF_ homing devices? My impression was that the
original poster was interested in RDF's, which operate on quite different frequencies. They are still common in many parts of the world. Some RDF's can be tuned over a very wide range. Gogarty wrote: Perhaps, but not here. I bought one on eBay, brand new in the box but very old. It worked just fine but I had no use for it and it took up a lot of space. So I sold it on eBay to a man with sentimental attachment to outmoded gadgets for slightly more thasn I paid for it. In any case, my understanding is that very few radio beacons are still in service. I used to have one that had plug-in modules for different frequency bands. It would take bearings on commercial AM stations as well as nav beacons and airports. But you're right, it was bulky and ate power and we didn't use it very much. Fresh Breezes- Doug King |
#9
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wrote in :
just wondering if they are still usable in the waters around the us and in other countries?? thanx for any/all input Sure....but they've moved frequency band from MF-HF to VHF http://www.servo.com/mardf.htm http://www.vitmarine.com/sit-525adf.html (If yer fishin' keep yer mouth shut!) http://www.nationalrf.com/vector-finder.htm (handheld...help ya find yer walkie talkie or that smartass on ch 16 down the dock.) http://www.dopsys.com/ Gummit buys this one. If the damned Coast Guard had one when those kids died on S/V "Morning Dew", there would have been no question WHERE the kid was screaming for help and the stupid CG watchstander MIGHT not have thought it was a hoax...saving lives. http://radio_tower_finder.hobbytron.com/r-ddf1.html Here, build your own! $169, complete. Use an array of Metz half-wave marine antennas instead of the 1/4 wave verticals stuck to the car because your boat doesn't have a ground plane....Hams use them for "fox hunts" where someone hides with a walkie and the hams run ragged across the county trying to find him. When I'm the fox, I park under the big powerlines which throws them off great!...(c; http://www.rdfproducts.com/ap_index.htm Here's more DF information than you'll want, all in one place... -- Larry You know you've had a rough night when you wake up and you're outlined in chalk. |
#10
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In article ,
Larry W4CSC wrote: wrote in : just wondering if they are still usable in the waters around the us and in other countries?? thanx for any/all input Sure....but they've moved frequency band from MF-HF to VHF Well Larry is half right..... They haven't moved anything, from anywhere. LF/MF/HF DFing is still available to anyone who has a DF Receiver that covers the LF/MF/HF Frequency Bands. USCG/FAA still maintain MF/HF Beacons around the US. All MF Broadcast Stations have known fixed Transmitters that can be used. MF/HF Marine Private Coast Stations can be DF'ed for position fixing. The art of using one of the older LF/MF/HF DF Receivers is just about a Dead Art, but that doesn't stop anyone from learning to do it like the Radiomen of the past. It is true as Larry states that VHF DFing is all the rage these days with really neat Hardware/ Software that makes it a lot easier for new guys. All it takes is time, and will..... Bruce in alaska one of the LAST of the Alaskan Cannery RadioMen... -- add a 2 before @ |
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