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#1
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I live in an apartment with no balcony, so reception can be a challenge.
A few years ago, I used a 32" telescoping whip I had in my spare parts box, and wrapped the entire length in a very tight coil of small guage copper wire. I left about 10" on the end, and screwed a large alligator clip on it. (I does not look like much, but in the window, it's almost invisible). Then I take it, and I place in in the window frame between the screen and the glass, so even if it's cold, I can still close the window almost all the way. I use 25 feet of small guage speaker wire with alligator clips on each end for my end fed feedline. I can then clip it to anything. It works well with portables of benchtop receivers. I can clip it to the antenna on top of my old Drake SSR and make it come alive. I can clip it to the back of my Kenwood R-300 and get the same result. On portables, I generally do not get overload. If I do, I just hook it to my MFJ-959B, and then I can play around with, or antennuate the signals. It was fun, it was cheap, and it works great. |
#2
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On Apr 18, 5:59 pm, "SWL-2010" wrote:
I live in an apartment with no balcony, so reception can be a challenge. A few years ago, I used a 32" telescoping whip I had in my spare parts box, and wrapped the entire length in a very tight coil of small guage copper wire. I left about 10" on the end, and screwed a large alligator clip on it. (I does not look like much, but in the window, it's almost invisible). Then I take it, and I place in in the window frame between the screen and the glass, so even if it's cold, I can still close the window almost all the way. I use 25 feet of small guage speaker wire with alligator clips on each end for my end fed feedline. I can then clip it to anything. It works well with portables of benchtop receivers. I can clip it to the antenna on top of my old Drake SSR and make it come alive. I can clip it to the back of my Kenwood R-300 and get the same result. On portables, I generally do not get overload. If I do, I just hook it to my MFJ-959B, and then I can play around with, or antennuate the signals. It was fun, it was cheap, and it works great. Mini-BroomStick Shortwave Listening (SWL) Antenna - In-the-Window http://groups.yahoo.com/group/Shortw.../message/12978 SWL-2010, Glad that you are enjoying your Home-Brewed In-the-Window Shortwave Listening (SWL) Antenna. But in general if you simply wrap Wire around a Metal Object and then use that Coiled Wire as an Antenna : You have simply increased the Diameter of the Metal Object by placing the Wire around it -and- the Electro-Mechanical properties of the Metal Object make the Wire Coil a slightly larger version of the original Metal Object. - - - Example : A 1/4" by 36" Brass Tube becomes a 3/8" by 36" Copper Wire Tube. Most of the time when a "Form" {Foundation} is used to Wrap Wire-On it is non-metalic. So often a Wood Dowel or a Plastic Tube. -Tip- White PVC Pipe works OK as a Form. 1 - Measure the Diagonal of a Window and Cut the Form to that Length. 2 - Drill a Hole through the Form close to both Ends. 3 - Use Stranded Hook-Up Wire for the Antenna Element 4 - Place one-end of the Wire in one of the Holes and tie a Knot in the Short piece of Wire coming out leaving 3"-6" inches to work with. 5 - Use a 12-18" piece of Thicker # 14 AWG Solid Copper Wire and Wrap it around the Form with the Antenna Wire about 3-4 Turns. The Thicker Solid Copper Wire becomes your Wire Spacing {Gap} Form to Wrap the Coil around the Form. Snake it {slowly and carefully} around the Form as you Wind your Antenna Wire Coil around the Length of the Form. 6 - When you get to the other-end of the cut the Wire so that you have about 3-6" to work with; and place the end of the Wire in the Hole at that end; and Tie a Knot in the Short piece of Wire coming out; and trim off the excess Wire. FWIW - On a 3/4" by 36" piece of PVC Pipe you will have about 5-6 Turns of Wire per Liner-Inch of Pipe. That would Add-Up-To about 180-216 Turns along the Length of the Pipe. The Length of Wire in One-Turn would be about 2.4" : So the Length of the Antenna Wire Element would be about 432-518" or about 36-43 Feet long. USE TIPS : * Generally with most In-the-Window Antennas having the Radio next to the Window {Very Close} is the better placement of the Antenna and Radio. * Clip a 'short' Lead-in-Wire from the Antenna to the Collapsed Whip Antenna of the Radio or the HI-Z Terminal of the Receiver. Sometimes you may find that using a Banana Plug pushed into the Center Pin of the LO-Z SO239 Plug works better. * Grounding the Radio may or may-not help. * -IF- You have an old 6.5" to 8" AM/MW Radio Ferrite Rod Core laying around : You can try sliding it In-and-Out of the Pipe to see what effect it has on AM/MW Reception. [IMHO] The-Better-Way * For Shortwave Receivers - Take a 3-8 Feet Piece of Coax Cable with a PL-359 Plug on One-End and only an Alligator Clip to the Center Conductor on the other-end can work well as a feed-in-line to reduce some of the "In-Side-Noise" -and- Again try this with the Receiver Grounded and Ungrounded. * For 'portable' AM/FM Shortwave Radios - Take a 3-8 Feet Piece of "Audio" {1/8"} Coax Cable with a 1/8" Mono Plug on One-End and only an Alligator Clip to the Center Conductor on the other-end can work well as a feed-in-line to reduce some of the "In-Side-Noise" -and- Again try this with the Radio Grounded and Ungrounded. Basically what you end up building is a shortened version of the so-called "BroomStick" {BroomStik} Antenna placed In-the-Window. READ - About - The Broomstick Antenna [Was: (repost) BroomStick Antenna Success ? http://www.google.com/group/rec.radi...95c243a57e7d1c * Short STACKED Vertical {Tri-Band} BroomStick Antenna http://www.google.com/group/rec.radi...c7e2e6a6bb395c * Arnie Coro 'BroomStick' Antenna - Getting Any Results? http://www.google.com/group/rec.radi...7afe4778718066 * One-More-Time - Arnie Coros' BroomStick Antenna - - - The "BS's" Secret's Revealed . . . http://www.google.com/group/rec.radi...abeec559035337 How to Ride the Radio Waves on a BroomStick ! - iane ~ RHF {pomkia} .. | | | / \ ........!....... |
#3
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![]() "RHF" wrote in message ups.com... On Apr 18, 5:59 pm, "SWL-2010" wrote: I live in an apartment with no balcony, so reception can be a challenge. A few years ago, I used a 32" telescoping whip I had in my spare parts box, and wrapped the entire length in a very tight coil of small guage copper wire. I left about 10" on the end, and screwed a large alligator clip on it. (I does not look like much, but in the window, it's almost invisible). Then I take it, and I place in in the window frame between the screen and the glass, so even if it's cold, I can still close the window almost all the way. I use 25 feet of small guage speaker wire with alligator clips on each end for my end fed feedline. I can then clip it to anything. It works well with portables of benchtop receivers. I can clip it to the antenna on top of my old Drake SSR and make it come alive. I can clip it to the back of my Kenwood R-300 and get the same result. On portables, I generally do not get overload. If I do, I just hook it to my MFJ-959B, and then I can play around with, or antennuate the signals. It was fun, it was cheap, and it works great. Mini-BroomStick Shortwave Listening (SWL) Antenna - In-the-Window http://groups.yahoo.com/group/Shortw.../message/12978 SWL-2010, Glad that you are enjoying your Home-Brewed In-the-Window Shortwave Listening (SWL) Antenna. I've been using it several years now, and it work great. But in general if you simply wrap Wire around a Metal Object and then use that Coiled Wire as an Antenna : You have simply increased the Diameter of the Metal Object by placing the Wire around it -and- the Electro-Mechanical properties of the Metal Object make the Wire Coil a slightly larger version of the original Metal Object. - - - Example : A 1/4" by 36" Brass Tube becomes a 3/8" by 36" Copper Wire Tube. I suppose since I didn't know that it did not keep me from enjoying my results. I have another one in the closet I pull out sometimes too. It's a slinky wrapped around a plastic rod about 6 feet long and about 1 inch thick. It works pretty well, but it will not fit right into the window frame like the other. I also have 30 feet of copper wire strung around the ceiling of my apartment that is actually a pretty effective low noise antenna. It's exceptional when conditions are good. Then I have the 20' Zep wire I got free with a radio purchase one time and I just kind of throw that into a corner, or clip it to a curtain rod. It's effective with small portables. I also have the Kaito Window loop which is OK, but does not have the kick that the antenna wrapped in wire does in the window. I have 4 reel antennas that I seem to get free with receivers I buy from E-Bay. I dont like them much at all. Then, I have the old standby the MFJ 959B to kind of tweak signals if I need to. So, for an apartment I'm doing pretty well. But, I have been doing this for almost a half century now, so, I kind of have an advantage. I inherited this hobby from my father, so I's a second generation SWL. I am obvioulsy not a tech, and I can't give the spec's and measurments with your expertise, but somehow or another, I still pull the signals out of thin air, and in the end, thats all that matters to me. My apartment is so full of radios and wire, and assorted electronics, my apt. manager calls my place "Radio Shack." It always makes me laugh. Thanks for the tips...have a good day, and happy DX! BTW, I'm having great reception right now, here in southern Ohio. I hope wherever you are, you are enjoying the same. Most of the time when a "Form" {Foundation} is used to Wrap Wire-On it is non-metalic. So often a Wood Dowel or a Plastic Tube. -Tip- White PVC Pipe works OK as a Form. 1 - Measure the Diagonal of a Window and Cut the Form to that Length. 2 - Drill a Hole through the Form close to both Ends. 3 - Use Stranded Hook-Up Wire for the Antenna Element 4 - Place one-end of the Wire in one of the Holes and tie a Knot in the Short piece of Wire coming out leaving 3"-6" inches to work with. 5 - Use a 12-18" piece of Thicker # 14 AWG Solid Copper Wire and Wrap it around the Form with the Antenna Wire about 3-4 Turns. The Thicker Solid Copper Wire becomes your Wire Spacing {Gap} Form to Wrap the Coil around the Form. Snake it {slowly and carefully} around the Form as you Wind your Antenna Wire Coil around the Length of the Form. 6 - When you get to the other-end of the cut the Wire so that you have about 3-6" to work with; and place the end of the Wire in the Hole at that end; and Tie a Knot in the Short piece of Wire coming out; and trim off the excess Wire. FWIW - On a 3/4" by 36" piece of PVC Pipe you will have about 5-6 Turns of Wire per Liner-Inch of Pipe. That would Add-Up-To about 180-216 Turns along the Length of the Pipe. The Length of Wire in One-Turn would be about 2.4" : So the Length of the Antenna Wire Element would be about 432-518" or about 36-43 Feet long. USE TIPS : * Generally with most In-the-Window Antennas having the Radio next to the Window {Very Close} is the better placement of the Antenna and Radio. * Clip a 'short' Lead-in-Wire from the Antenna to the Collapsed Whip Antenna of the Radio or the HI-Z Terminal of the Receiver. Sometimes you may find that using a Banana Plug pushed into the Center Pin of the LO-Z SO239 Plug works better. * Grounding the Radio may or may-not help. * -IF- You have an old 6.5" to 8" AM/MW Radio Ferrite Rod Core laying around : You can try sliding it In-and-Out of the Pipe to see what effect it has on AM/MW Reception. [IMHO] The-Better-Way * For Shortwave Receivers - Take a 3-8 Feet Piece of Coax Cable with a PL-359 Plug on One-End and only an Alligator Clip to the Center Conductor on the other-end can work well as a feed-in-line to reduce some of the "In-Side-Noise" -and- Again try this with the Receiver Grounded and Ungrounded. * For 'portable' AM/FM Shortwave Radios - Take a 3-8 Feet Piece of "Audio" {1/8"} Coax Cable with a 1/8" Mono Plug on One-End and only an Alligator Clip to the Center Conductor on the other-end can work well as a feed-in-line to reduce some of the "In-Side-Noise" -and- Again try this with the Radio Grounded and Ungrounded. Basically what you end up building is a shortened version of the so-called "BroomStick" {BroomStik} Antenna placed In-the-Window. READ - About - The Broomstick Antenna [Was: (repost) BroomStick Antenna Success ? http://www.google.com/group/rec.radi...95c243a57e7d1c * Short STACKED Vertical {Tri-Band} BroomStick Antenna http://www.google.com/group/rec.radi...c7e2e6a6bb395c * Arnie Coro 'BroomStick' Antenna - Getting Any Results? http://www.google.com/group/rec.radi...7afe4778718066 * One-More-Time - Arnie Coros' BroomStick Antenna - - - The "BS's" Secret's Revealed . . . http://www.google.com/group/rec.radi...abeec559035337 How to Ride the Radio Waves on a BroomStick ! - iane ~ RHF {pomkia} . | | | / \ .......!....... |
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