|
Simple AM Loop Antenna?
Hello everyone :) I am looking for detailed plans for an AM loop. I will
be using it only for one frequency 1370AM so I dont want any tuners just a simple AM Loop antenna for my AM radio. I will have to solder a 1/8 plug to a 6-8 ft feedline to connect to my radio. It is a Kaito portable model 1103. I want to built this AM Loop cause I listen to talk radio alot and the static and other distant stations sometimes make it hard. I have done alot of looking around on google searches but have found no real detailed plans I am not sure if I should go with edge wound or Spiral wound. Any info you guys can give especially a detailed plan would be greatly appreciated. or maybe there is a website I may not have seen you would like to suggest. I am sure I have seen most of them atleast the most popular ones. Anyways thanks in advance for any input:) Bill |
Simple AM Loop Antenna?
Just before you go to a lot of work, have you tried rotating
the radio? Most have a ferrite loop antenna which is pretty directional. Irv VE6BP Bill wrote: Hello everyone :) I am looking for detailed plans for an AM loop. I will be using it only for one frequency 1370AM -------------------------------------- Visit my HomePage at http://members.shaw.ca/finkirv/index.html Visit my Baby Sofia website at http://members.shaw.ca/finkirv4/index.htm Visit my OLDTIMERS website at http://members.shaw.ca/finkirv5/index.htm -------------------- Irv Finkleman, Grampa/Ex-Navy/Old Fart/Ham Radio VE6BP Calgary, Alberta, Canada |
Simple AM Loop Antenna?
Yes I have lol :) The station I am trying to recieve usually comes in pretty
good but sometimes at night it gets noisy. It is my understanding that an external AM Loop antenna will recieve better than an internal loop that comes with a small portable. I also have heard that a Loop picks up less noise than an internal ferrite loop or random wire would. I have heard that these external AM Loop antennas used to be quite common in the good ol' days. But that they fell out of favor with most people to be replaced with the internal ferrite loopstick antennas. If anyone has some detailed plans for these older styled external AM Loop antennas I would really like to get ahold of them. Thanks in Advance :) Bill "Irv Finkleman" wrote in message ... Just before you go to a lot of work, have you tried rotating the radio? Most have a ferrite loop antenna which is pretty directional. Irv VE6BP Bill wrote: Hello everyone :) I am looking for detailed plans for an AM loop. I will be using it only for one frequency 1370AM -------------------------------------- Visit my HomePage at http://members.shaw.ca/finkirv/index.html Visit my Baby Sofia website at http://members.shaw.ca/finkirv4/index.htm Visit my OLDTIMERS website at http://members.shaw.ca/finkirv5/index.htm -------------------- Irv Finkleman, Grampa/Ex-Navy/Old Fart/Ham Radio VE6BP Calgary, Alberta, Canada |
Simple AM Loop Antenna?
Hello Bill,
Try - http://rffun.com/catalog/mwant/4316.html Variable caps are getting hard to come by, so a $49.95 to $59.95 price for the completed project seems very reasonable. I purchased one of these for my step father and it works great. You probably will not need a direct connection to the radio, just place the Select-A-Tenna next to the radio. If you are determined to build one (as I was), just google "AM Loop Antenna" Lots of great articles out there. Regards, Christopher Cox Bill wrote: Hello everyone :) I am looking for detailed plans for an AM loop. I will be using it only for one frequency 1370AM so I dont want any tuners just a simple AM Loop antenna for my AM radio. I will have to solder a 1/8 plug to a 6-8 ft feedline to connect to my radio. It is a Kaito portable model 1103. I want to built this AM Loop cause I listen to talk radio alot and the static and other distant stations sometimes make it hard. I have done alot of looking around on google searches but have found no real detailed plans I am not sure if I should go with edge wound or Spiral wound. Any info you guys can give especially a detailed plan would be greatly appreciated. or maybe there is a website I may not have seen you would like to suggest. I am sure I have seen most of them atleast the most popular ones. Anyways thanks in advance for any input:) Bill |
Simple AM Loop Antenna?
Thanks for the input Christopher :) I am indeed determined to build one. I
don't want to build a tuning one though. I am more interested in a simple AM Loop that just connects to my radio to pick up AM broadcast. These use to be popular. I suppose it was when radios first started to come out. Anyways like I said they eventually were replaced by internal Ferrite loopsticks. I suppose people did not like these big ugly antennas on top of there radio. I don't think these old AM Loops had Tuners. And I think they may have been spiral wound. You connect the 2 wires from the antenna to the screw terminals on the back of the radio. But in my case I would have to connect an 1/8 plug to plug into my Radio. I have no idea what the size of the frame would be? How long the wire would be? and how many turns around the frame to make? I have searched Google and have not found what I am looking for there. I have found a couple of books but can't afford the price tag at the moment. I don't even know If the antenna I am looking for is even in the book. Here is a link to a few I have found if anyone is curious. http://www.universal-radio.com/catalog/books/0016.html http://www.universal-radio.com/catalog/books/3113.html http://www.universal-radio.com/catalog/books/0533.html If anyone else has any suggestions I am all ears. Or if you have any of these books and could comment on it. I appreciate it. Thank You Bill "Christopher Cox" wrote in message ... Hello Bill, Try - http://rffun.com/catalog/mwant/4316.html Variable caps are getting hard to come by, so a $49.95 to $59.95 price for the completed project seems very reasonable. I purchased one of these for my step father and it works great. You probably will not need a direct connection to the radio, just place the Select-A-Tenna next to the radio. If you are determined to build one (as I was), just google "AM Loop Antenna" Lots of great articles out there. Regards, Christopher Cox Bill wrote: Hello everyone :) I am looking for detailed plans for an AM loop. I will be using it only for one frequency 1370AM so I dont want any tuners just a simple AM Loop antenna for my AM radio. I will have to solder a 1/8 plug to a 6-8 ft feedline to connect to my radio. It is a Kaito portable model 1103. I want to built this AM Loop cause I listen to talk radio alot and the static and other distant stations sometimes make it hard. I have done alot of looking around on google searches but have found no real detailed plans I am not sure if I should go with edge wound or Spiral wound. Any info you guys can give especially a detailed plan would be greatly appreciated. or maybe there is a website I may not have seen you would like to suggest. I am sure I have seen most of them atleast the most popular ones. Anyways thanks in advance for any input:) Bill |
Simple AM Loop Antenna?
"Bill" wrote in message .. . Thanks for the input Christopher :) I am indeed determined to build one. I don't want to build a tuning one though. I am more interested in a simple AM Loop that just connects to my radio to pick up AM broadcast. These use to be popular. I suppose it was when radios first started to come out. Anyways like I said they eventually were replaced by internal Ferrite loopsticks. I suppose people did not like these big ugly antennas on top of there radio. I don't think these old AM Loops had Tuners. And I think they may have been spiral wound. You connect the 2 wires from the antenna to the screw terminals on the back of the radio. But in my case I would have to connect an 1/8 plug to plug into my Radio. I have no idea what the size of the frame would be? How long the wire would be? and how many turns around the frame to make? I have searched Google and have not found what I am looking for there. I have found a couple of books but can't afford the price tag at the moment. I don't even know If the antenna I am looking for is even in the book. Here is a link to a few I have found if anyone is curious. http://www.universal-radio.com/catalog/books/0016.html http://www.universal-radio.com/catalog/books/3113.html http://www.universal-radio.com/catalog/books/0533.html If anyone else has any suggestions I am all ears. Or if you have any of these books and could comment on it. I appreciate it. Thank You Bill "Christopher Cox" wrote in message ... Hello Bill, Try - http://rffun.com/catalog/mwant/4316.html Variable caps are getting hard to come by, so a $49.95 to $59.95 price for the completed project seems very reasonable. I purchased one of these for my step father and it works great. You probably will not need a direct connection to the radio, just place the Select-A-Tenna next to the radio. If you are determined to build one (as I was), just google "AM Loop Antenna" Lots of great articles out there. Regards, Christopher Cox Bill wrote: Hello everyone :) I am looking for detailed plans for an AM loop. I will be using it only for one frequency 1370AM so I dont want any tuners just a simple AM Loop antenna for my AM radio. I will have to solder a 1/8 plug to a 6-8 ft feedline to connect to my radio. It is a Kaito portable model 1103. I want to built this AM Loop cause I listen to talk radio alot and the static and other distant stations sometimes make it hard. I have done alot of looking around on google searches but have found no real detailed plans I am not sure if I should go with edge wound or Spiral wound. Any info you guys can give especially a detailed plan would be greatly appreciated. or maybe there is a website I may not have seen you would like to suggest. I am sure I have seen most of them atleast the most popular ones. Anyways thanks in advance for any input:) Bill Hi Bill I built a couple AM loops last year. One is 4 feet on a side and the other is 2 feet on a side. Both are made from PVC pipe and "hook up wire". I can send you pictures. If *I* was involved with the project of building this loop with you, I'd sure try to get you to make tunable. Both of my AM loops are very sensitive to getting the capacitor adjusted properly. I have connected the loops to the receiver with two parallel wires from the antenna to the receiver. That seems to work OK. There is lots and lots of instructions for designing and building AM loops on the Internet. From what I read, you are mainly interested in building just one good antenna. You may not need a book for that. Jerry Jerry |
Simple AM Loop Antenna?
On Tue, 5 Dec 2006 20:34:30 -0600, Bill wrote:
Thanks for the input Christopher :) I am indeed determined to build one. I don't want to build a tuning one though. Go ahead and build a tuneable one. It's not _that_ more complicated. Besides, the minute you would finish your no-tune antenna, Clear Channel Communications will buy up your favorite talk station and convert it to country and western. Then you'll have to look elsewhere up and down the AM band. Jonesy -- Marvin L Jones | jonz | W3DHJ | linux 38.24N 104.55W | @ config.com | Jonesy | OS/2 *** Killfiling google posts: http//jonz.net/ng.htm |
Simple AM Loop Antenna?
"Irv Finkleman" wrote in message ... Just before you go to a lot of work, have you tried rotating the radio? Most have a ferrite loop antenna which is pretty directional. Irv VE6BP Bill wrote: Hello everyone :) I am looking for detailed plans for an AM loop. I will be using it only for one frequency 1370AM -------------------------------------- Visit my HomePage at http://members.shaw.ca/finkirv/index.html Visit my Baby Sofia website at http://members.shaw.ca/finkirv4/index.htm Visit my OLDTIMERS website at http://members.shaw.ca/finkirv5/index.htm -------------------- Irv Finkleman, Grampa/Ex-Navy/Old Fart/Ham Radio VE6BP Calgary, Alberta, Canada I think just about anything is better than the ferrite antenna in most AM BCB radios. When I was a teenager the local 5KW radio station would go directional and reduce its power to 1kW. When it did this I could barely pick it up. Five miles down the road it boomed in. Unfortunately this was also the time it started the programing I enjoyed. I already had 4 hooks in the wall roughly in a square so I drped some antenna rotr wire arounfd the hooks and connected the ends together to form a coil. From the two open ends I ran a coax to a two turn loop i slipped over the ferrite antenna. worked like a champ not to mention it allowed me to pick up a lot of other radio stations from my South Ga.location including WLS with John "records truly is my middle name " Landecker. After being able to pick up WLS I soon lost interest in the local station. Anyway this was probably not the best antenna but it did the job. |
Simple AM Loop Antenna? may have found it
After searching for about a week now on Google I think I may have stumbled
on something here. What do you guys think about this AM loop? If nothing else it should atleast work better than the internal Ferrite Loopstick right? It requires no tuner. http://members.cox.net/rwagoner/columns/am_antenna.html "Bill" wrote in message . .. Hello everyone :) I am looking for detailed plans for an AM loop. I will be using it only for one frequency 1370AM so I dont want any tuners just a simple AM Loop antenna for my AM radio. I will have to solder a 1/8 plug to a 6-8 ft feedline to connect to my radio. It is a Kaito portable model 1103. I want to built this AM Loop cause I listen to talk radio alot and the static and other distant stations sometimes make it hard. I have done alot of looking around on google searches but have found no real detailed plans I am not sure if I should go with edge wound or Spiral wound. Any info you guys can give especially a detailed plan would be greatly appreciated. or maybe there is a website I may not have seen you would like to suggest. I am sure I have seen most of them atleast the most popular ones. Anyways thanks in advance for any input:) Bill |
Simple AM Loop Antenna?
I think just about anything is better than the ferrite antenna in most AM BCB radios. When I was a teenager the local 5KW radio station would go directional and reduce its power to 1kW. When it did this I could barely pick it up. Five miles down the road it boomed in. Unfortunately this was also the time it started the programing I enjoyed. I already had 4 hooks in the wall roughly in a square so I drped some antenna rotr wire arounfd the hooks and connected the ends together to form a coil. From the two open ends I ran a coax to a two turn loop i slipped over the ferrite antenna. worked like a champ not to mention it allowed me to pick up a lot of other radio stations from my South Ga.location including WLS with John "records truly is my middle name " Landecker. After being able to pick up WLS I soon lost interest in the local station. Anyway this was probably not the best antenna but it did the job. Could be the antenna was coupled to the radio by just wraping the coupling coil around the radio. I forget which way worked the best now. |
Simple AM Loop Antenna?
Bill ha escrito: Hello everyone :) I am looking for detailed plans for an AM loop. I will be using it only for one frequency 1370AM so I dont want any tuners just a simple AM Loop antenna for my AM radio. I will have to solder a 1/8 plug to a 6-8 ft feedline to connect to my radio. It is a Kaito portable model 1103. I want to built this AM Loop cause I listen to talk radio alot and the static and other distant stations sometimes make it hard. I have done alot of looking around on google searches but have found no real detailed plans I am not sure if I should go with edge wound or Spiral wound. Any info you guys can give especially a detailed plan would be greatly appreciated. or maybe there is a website I may not have seen you would like to suggest. I am sure I have seen most of them atleast the most popular ones. Anyways thanks in advance for any input:) Bill Hello Bill, Regarding your AM loop antenna. Are you sure the external antenna socket also works for AM? You may check this by inserting a plug without antenna. The ferrite antenna in your radio will not be that bad. You mentioned static and other distant stations. I am not sure whether the loop will improve the reception. Has the signal from your favorite radio station sufficient strength (on your current radio)? Before you build, try to locate (with your current receiver) the best place and orientation for your loop to be built. Do not use the external adapter for this. If you cannot find a place/orientation with good reception, a loop will not do much better. If you found a good place, power your radio via the mains adapter. This will clarify whether noise from the mains enters the ferrite antenna. If so, the loop design must be such that noise does not reach the loop via the cable between the loop and your receiver. Generaly a loop will only help to overcome the radio's internal noise (bad Sensitivity) and spurious products (generated by your receiver) and interference from nearby sources (electronic equipment). The last item only, when you can position your loop away from any interfering source. The loop will also not improve interference from a very strong adjacent station. You may orient the loop to get a strong adjacent station into a null, but this is possible with the built-in ferrite antenna too. Regarding tuning. With average means, a resonating (=tuned) loop can be made smaller and better. When you use fixed capacitors for most of the required capacitance, you may use a smaller (mica compression) trimmer capacitor to do the fine tuning to your desired frequency. I hope this will help you a bit. Best regards, Wim PA3DJS |
Simple AM Loop Antenna?
Bill wrote:
Yes I have lol :) The station I am trying to recieve usually comes in pretty good but sometimes at night it gets noisy. It is my understanding that an external AM Loop antenna will recieve better than an internal loop that comes with a small portable. I also have heard that a Loop picks up less noise than an internal ferrite loop or random wire would. I have heard that these external AM Loop antennas used to be quite common in the good ol' days. But that they fell out of favor with most people to be replaced with the internal ferrite loopstick antennas. If anyone has some detailed plans for these older styled external AM Loop antennas I would really like to get ahold of them. Thanks in Advance :) Bill A friend of mine makes them. He uses the variable capacitor out of old AM radios. He winds a number of turns of #30 wire on a one foot diameter round piece of Styrofoam. He first determined the number of turns needed by GDOing the coil and cap in parallel to about 550 kc. Seems to me he used 20-30 turns. Just sitting it close to the radio and tuning it to resonance solved his reception problem. It was resonant and directional and its field was all the internal ferrite loop antenna needed in his case. CCrane sells similar loops under the trade name Select-A-Tenna. http://www.ccrane.com/antennas/am-antennas/ -- 73, Cecil http://www.w5dxp.com |
Simple AM Loop Antenna?
Bill wrote:
Hello everyone :) I am looking for detailed plans for an AM loop. I will be using it only for one frequency 1370AM so I dont want any tuners just a simple AM Loop antenna for my AM radio. I will have to solder a 1/8 plug to a 6-8 ft feedline to connect to my radio. It is a Kaito portable model 1103. I want to built this AM Loop cause I listen to talk radio alot and the static and other distant stations sometimes make it hard. I have done alot of looking around on google searches but have found no real detailed plans I am not sure if I should go with edge wound or Spiral wound. Any info you guys can give especially a detailed plan would be greatly appreciated. or maybe there is a website I may not have seen you would like to suggest. I am sure I have seen most of them atleast the most popular ones. Anyways thanks in advance for any input:) Bill Bill, I have built a number of small receiving loops, and they all work very well. The easiest way to design the loop is to use a small (and free) program written by Reg Edwards. Go to his website (http://www.btinternet.com/~g4fgq.reg...3.html#S301%22) and download RJELOOP3. It will give you all the info you need, including the approximate capacitance to resonate the loop. The basic loop consists of about .1 wavelength of wire for the highest frequency of interest. A larger loop with fewer turns is much more efficient than a smaller one using more turns. You will need a variable cap to determine resonance - the thing tunes too sharp to "cut and try". Once the cap value is determined, have it measured and make up a fixed cap if you really don't want to use a variable. You can use a single turn of wire around the main loop as a low Z pickup that won't excessively load the main loop, of come off the cap directly to a hi Z FET amp with a low Z output to the radio. That makes tuning really sharp. These loops have very sharp rejection, but work best during the day. At night, there are often too many interferring stations, but it's still worth a try. bob baldwin |
Simple AM Loop Antenna?
Bill wrote:
Hello everyone :) I am looking for detailed plans for an AM loop. I will be using it only for one frequency 1370AM so I dont want any tuners just a simple AM Loop antenna for my AM radio. I will have to solder a 1/8 plug to a 6-8 ft feedline to connect to my radio. It is a Kaito portable model 1103. I want to built this AM Loop cause I listen to talk radio alot and the static and other distant stations sometimes make it hard. I have done alot of looking around on google searches but have found no real detailed plans I am not sure if I should go with edge wound or Spiral wound. Any info you guys can give especially a detailed plan would be greatly appreciated. or maybe there is a website I may not have seen you would like to suggest. I am sure I have seen most of them atleast the most popular ones. Anyways thanks in advance for any input:) Bill Bill, Forget about the antenna problem. The bigger challenge is distinguishing talk radio programming from static and interference, even if the radio reception is perfect. 8-) 73, Gene W4SZ |
Simple AM Loop Antenna?
Allodoxaphobia wrote:
On Tue, 5 Dec 2006 20:34:30 -0600, Bill wrote: Thanks for the input Christopher :) I am indeed determined to build one. I don't want to build a tuning one though. Go ahead and build a tuneable one. It's not _that_ more complicated. Besides, the minute you would finish your no-tune antenna, Clear Channel Communications will buy up your favorite talk station and convert it to country and western. Then you'll have to look elsewhere up and down the AM band. Jonesy I thought Colorado was part of the Wild West. Is is legal to listen to anything other than C&W? 8-) 73, Gene W4SZ |
Simple AM Loop Antenna?
"Bill" wrote in message . .. Hello everyone :) I am looking for detailed plans for an AM loop. I will be using it only for one frequency 1370AM so I dont want any tuners just a simple AM Loop antenna for my AM radio. I will have to solder a 1/8 plug to a 6-8 ft feedline to connect to my radio. It is a Kaito portable model 1103. I want to built this AM Loop cause I listen to talk radio alot and the static and other distant stations sometimes make it hard. I have done alot of looking around on google searches but have found no real detailed plans I am not sure if I should go with edge wound or Spiral wound. Any info you guys can give especially a detailed plan would be greatly appreciated. or maybe there is a website I may not have seen you would like to suggest. I am sure I have seen most of them atleast the most popular ones. Anyways thanks in advance for any input:) Bill Bill, Make your loop tunable. Variable caps aren't that hard to find. Find a program to calculate the inductance of an inductor. Try a google search of Reg Edwards, Reg is no longer with us but his wonderful programs are still available. (Someone else may want to post some solenoid inductance calculators) Make an inductor of 240uh. ( Yes, other values will work) A pure 240uh inductor and a 56pf cap resonate at about 1370khz. (no inductor is pure, your inductor will have interwinding capacitance, maybe 15pf, so 56pf minus 15pf is 41pf) So 41pf would make it resonate at 1370khz. (pf = picofarad) You could use a 100pf cap that will tune from about 1000khz to almost 1600khz. Using a 365pf cap, this will tune almost the entire AM band. Make an inductor of whatever size you are comfortable with 1ft to 8ft. (Rotation is important but once you find the direction that minimizes noise for your one station you have it.) So if you have a wall that is oriented correctly you could string wire around the corners. You can go simple, as in wind it on styrofoam or a carboard box or spend time on a good frame and base and easy rotation. If you get this far then there are a few ways to couple the signal into your radio. Tell me what you don't understand and I'll do my best to inform you. Mike |
Simple AM Loop Antenna?
Gene Fuller wrote:
Bill wrote: Hello everyone :) I am looking for detailed plans for an AM loop. I will be using it only for one frequency 1370AM so I dont want any tuners just a simple AM Loop antenna for my AM radio. I will have to solder a 1/8 plug to a 6-8 ft feedline to connect to my radio. It is a Kaito portable model 1103. I want to built this AM Loop cause I listen to talk radio alot and the static and other distant stations sometimes make it hard. I have done alot of looking around on google searches but have found no real detailed plans I am not sure if I should go with edge wound or Spiral wound. Any info you guys can give especially a detailed plan would be greatly appreciated. or maybe there is a website I may not have seen you would like to suggest. I am sure I have seen most of them atleast the most popular ones. Anyways thanks in advance for any input:) Bill Bill, Forget about the antenna problem. The bigger challenge is distinguishing talk radio programming from static and interference, even if the radio reception is perfect. 8-) 73, Gene W4SZ Personally, I love talk radio. I have, long ago, given up on getting any real information from major networks ... but then if I had to listen to rush, or chaps like him, I'd abandon talk radio also! A tuned loop is the way to go. The only real practical application of one needs a variable cap in my humble opinion ... JS |
Simple AM Loop Antenna? may have found it
On Wed, 6 Dec 2006 00:07:24 -0600, "Bill" wrote:
After searching for about a week now on Google I think I may have stumbled on something here. What do you guys think about this AM loop? If nothing else it should atleast work better than the internal Ferrite Loopstick right? It requires no tuner. http://members.cox.net/rwagoner/columns/am_antenna.html Hi Bill, Give it a try. It may work for what you want it to do, but if you add a capacitor, it will do considerably better. Also, claims of canceling noise are rarely demonstrated without care and attention to design (this one does not go that extra mile). 73's Richard Clark, KB7QHC |
Simple AM Loop Antenna?
Bill wrote:
... Far as mw loops go, this person has put together a reasonable page with good links: http://www.mindspring.com/~loop_antenna/ JS |
Simple AM Loop Antenna?
Gene Fuller wrote:
Is is legal to listen to anything other than C&W? Johnny Cash was doing rap long before there were any rappers. :-) -- 73, Cecil http://www.w5dxp.com |
Simple AM Loop Antenna?
Bill wrote:
Hello everyone :) I am looking for detailed plans for an AM loop. I will ... Bill: How about a "black hole antenna?" http://www.unusualresearch.com/Sutton/sutton.htm JS |
Simple AM Loop Antenna?
For reception you can get those little tuning caps they use in
the portables -- about 1 inch square and half an inch thick. You can usually find them at Radio Scrap -- er Shack. Irv John Smith wrote: Gene Fuller wrote: Bill wrote: Hello everyone :) I am looking for detailed plans for an AM loop. I will be using it only for one frequency 1370AM so I dont want any tuners just a simple AM Loop antenna for my AM radio. I will have to solder a 1/8 plug to a 6-8 ft feedline to connect to my radio. It is a Kaito portable model 1103. I want to built this AM Loop cause I listen to talk radio alot and the static and other distant stations sometimes make it hard. I have done alot of looking around on google searches but have found no real detailed plans I am not sure if I should go with edge wound or Spiral wound. Any info you guys can give especially a detailed plan would be greatly appreciated. or maybe there is a website I may not have seen you would like to suggest. I am sure I have seen most of them atleast the most popular ones. Anyways thanks in advance for any input:) Bill Bill, Forget about the antenna problem. The bigger challenge is distinguishing talk radio programming from static and interference, even if the radio reception is perfect. 8-) 73, Gene W4SZ Personally, I love talk radio. I have, long ago, given up on getting any real information from major networks ... but then if I had to listen to rush, or chaps like him, I'd abandon talk radio also! A tuned loop is the way to go. The only real practical application of one needs a variable cap in my humble opinion ... JS -- -------------------------------------- Visit my HomePage at http://members.shaw.ca/finkirv/index.html Visit my Baby Sofia website at http://members.shaw.ca/finkirv4/index.htm Visit my OLDTIMERS website at http://members.shaw.ca/finkirv5/index.htm -------------------- Irv Finkleman, Grampa/Ex-Navy/Old Fart/Ham Radio VE6BP Calgary, Alberta, Canada |
Simple AM Loop Antenna?
Bob Baldwin wrote:
"The easiest way to design the loop is to use a small (and free) program written by Reg Edwards. Go to his website (http://www.btinternet.com/~g4fgq.reg/page3.html#S301%22 and download RJELOOP3. Glad someone is keeping Reg`s remarkable work available since his too soon death. Best regards, Richard Harrison, KB5WZI |
Simple AM Loop Antenna?
Bob Baldwin wrote:
"The easiest way to design the loop is to use a small (and free) program written by Reg Edwards. Go to his website (http://www.btinternet.com/~g4fgq.reg/page3.html#S301%22 and download RJELOOP3. Glad someone is keeping Reg`s remarkable work available since his too soon death. Best regards, Richard Harrison, KB5WZI |
Simple AM Loop Antenna?
On Tue, 05 Dec 2006 22:17:18 GMT, Bill wrote:
Hello everyone :) I am looking for detailed plans for an AM loop. I will be using it only for one frequency 1370AM so I dont want any tuners just a simple AM Loop antenna for my AM radio. I will have to solder a 1/8 plug to a 6-8 ft feedline to connect to my radio. It is a Kaito portable model 1103. I want to built this AM Loop cause I listen to talk radio alot and the static and other distant stations sometimes make it hard. I have done alot of looking around on google searches but have found no real detailed plans I am not sure if I should go with edge wound or Spiral wound. Any info you guys can give especially a detailed plan would be greatly appreciated. or maybe there is a website I may not have seen you would like to suggest. I am sure I have seen most of them atleast the most popular ones. Anyways thanks in advance for any input:) Bill Get a GE SuperRadio III. It's cheap. About $50. It also has a built-in 8-inch ferrite antenna. Cheapest radio I know of that has that big a ferrite. Also has a screw terminal on back that accepts an external AM wire antenna. If that doesn't do it, get the Select-A-Tenna external loop fro |
Simple AM Loop Antenna?
"Bill" wrote in message . .. Hello everyone :) I am looking for detailed plans for an AM loop. I will be using it only for one frequency 1370AM so I dont want any tuners just a simple AM Loop antenna for my AM radio. I will have to solder a 1/8 plug to a 6-8 ft feedline to connect to my radio. It is a Kaito portable model 1103. I want to built this AM Loop cause I listen to talk radio alot and the static and other distant stations sometimes make it hard. I have done alot of looking around on google searches but have found no real detailed plans I am not sure if I should go with edge wound or Spiral wound. Any info you guys can give especially a detailed plan would be greatly appreciated. or maybe there is a website I may not have seen you would like to suggest. I am sure I have seen most of them atleast the most popular ones. Anyways thanks in advance for any input:) Bill Bill, Refer to the posters who recommended you search the web. Find a tested design. There are so-o-o-o many variables. A few notes from my experience; You can couple to an existing radio four ways (assuming you don't have a ready-made External Antenna jack): a) Solder a wire onto the tuning capacitor of the existing radio. This will detune it, so you'll have to adjust the trimmer. This worked wonderfully well for a cheap battery portable radio that I used on a Navy ship. It has decent AM sensitivity without anything connected to the wire, but inside the ship I needed the connection to use a ship's antenna which was available to me. b) Wind a few turns of wire around the AM loopstick, connect one end to a ground and the other end to your external AM loop. c) Same as above but wind the turns around the whole radio. You probably get poorer coupling, but you don't need to open the radio. d) Put the loop near the radio. (See following anecdote.) Some years ago, having the same need you describe, I built an AM loop with a random coil and a junk AM radio tuning cap to resonate it. I just dug it out. The coil consists of 18 turns of hookup wire around the lid of a paper case, the box that hold ten reams of printer paper. It only tunes the bottom third of the BC band, so it's probably got too much inductance. I can couple to a radio merely by putting it next to the radio; the improvement is most noticeable on weaker stations and the effectiveness varies wildly with the orientation of the radio and the loop. If I added an external antenna wire and a ground, things would change. |
Simple AM Loop Antenna?
Thank You all for your input. I have decided to Build a tuning AM Loop. It
doesn't seem like it should too big of a project. It would be nice to have the capability of tuning and I may mess with trying to make it tune some of the lower Shortwave bands as well. Thanks again for all the input. Great bunch of people in here :) Bill |
Simple AM Loop Antenna?
"Bill" wrote in message ... Thank You all for your input. I have decided to Build a tuning AM Loop. It doesn't seem like it should too big of a project. It would be nice to have the capability of tuning and I may mess with trying to make it tune some of the lower Shortwave bands as well. Thanks again for all the input. Great bunch of people in here :) Bill I may mess with trying to make it tune some of the lower Shortwave bands as well. Easier said than done. If you use a 240uh inductor and you tweaked it for minimum interwinding capacitance your high end frequency (might) reach 1700khz. A switching system could be used that switched out some of the turns on your inductor, this could get you higher frequencies. If you started with a 100uh inductor and a 365pf cap this would tune about 850khz to almost 3Mhz. BTW do you have the formula to calculate the resonate frequency? Have tried any dimensions and turns and calculated inductors? Mike |
Simple AM Loop Antenna?
"Bill" wrote in message ... Thank You all for your input. I have decided to Build a tuning AM Loop. It doesn't seem like it should too big of a project. It would be nice to have the capability of tuning and I may mess with trying to make it tune some of the lower Shortwave bands as well. Thanks again for all the input. Great bunch of people in here :) One more thing: US Coast Guard ships have what they call a mini-loop HF antenna. It is about four feet in diameter and mounted vertically and that's all I know about it. (I did an electronic systems inspection on a couple of cutters and I know they have the loops for hf xmit.) |
| All times are GMT +1. The time now is 10:27 AM. |
Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
RadioBanter.com