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#1
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Question about antennas
I have a JVC MX-J50. The FM antenna seems to be just a piece a wire. I
would like to listen to a local FM station on 90.5 MHz. This station is hard to receive. When I touch the wire to reposition it the station comes in clearly as soon as I let go of the wire it disappears. Can someone patiently explain to me all that and how to get to work. What kind of indoor antenna can I make or buy to get this station? Thanks. |
#2
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"Nathan Gutman" wrote ...
I have a JVC MX-J50. The FM antenna seems to be just a piece a wire. I would like to listen to a local FM station on 90.5 MHz. This station is hard to receive. When I touch the wire to reposition it the station comes in clearly as soon as I let go of the wire it disappears. Can someone patiently explain to me all that and how to get to work. What kind of indoor antenna can I make or buy to get this station? Thanks. You could experiment with just adding more wire to the length you currently have (the equivalent of touching it). It may be sensitive to position and orientation as FM radio waves are pretty direcional. Or you could Google for: DX FM antenna ("DX" is the radio abbreviation for "distance") |
#3
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I found instructions to design and make a simple antenna for the
frequency I want to receive out of 300ohm twin lead-in wire. The receiver needs a 75ohm antenna. Do I need a matching transformer? I see that Radio Shack has one for $3.99. On Thu, 2 Jun 2005 07:17:37 -0700, "Richard Crowley" wrote: "Nathan Gutman" wrote ... I have a JVC MX-J50. The FM antenna seems to be just a piece a wire. I would like to listen to a local FM station on 90.5 MHz. This station is hard to receive. When I touch the wire to reposition it the station comes in clearly as soon as I let go of the wire it disappears. Can someone patiently explain to me all that and how to get to work. What kind of indoor antenna can I make or buy to get this station? Thanks. You could experiment with just adding more wire to the length you currently have (the equivalent of touching it). It may be sensitive to position and orientation as FM radio waves are pretty direcional. Or you could Google for: DX FM antenna ("DX" is the radio abbreviation for "distance") |
#4
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On Thu, 02 Jun 2005 14:04:58 GMT, Nathan Gutman
wrote: I have a JVC MX-J50. The FM antenna seems to be just a piece a wire. I would like to listen to a local FM station on 90.5 MHz. This station is hard to receive. When I touch the wire to reposition it the station comes in clearly as soon as I let go of the wire it disappears. Can someone patiently explain to me all that and how to get to work. What kind of indoor antenna can I make or buy to get this station? Thanks. US FK sits (along with othe services) between TV channels 6 and 7. Almost any VHF (2-13) TV antenna would work. I connect my FM to the same roof antenna system as my TV (No cable or satellite in my house). As others mentioned a DX antenna works better, especially if you have signal reflection problems. , _ , | \ MKA: Steve Urbach , | )erek No JUNK in my email please , ____|_/ragonsclaw , / / / Running United Devices "Cure For Cancer" Project 24/7 Have you helped? http://www.grid.org |
#5
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On Thu, 02 Jun 2005 16:02:45 GMT, Nathan Gutman
wrote: I found instructions to design and make a simple antenna for the frequency I want to receive out of 300ohm twin lead-in wire. The receiver needs a 75ohm antenna. Do I need a matching transformer? I see that Radio Shack has one for $3.99. Yes, get a transformer if the radio receiver only has a 75 ohm F connector. Do the plans have you make this sort of diapole? That's the antenna you want. http://www.radioshack.com/product.as...5Fid=42%2D2385 This is the transformer I believe you need and are referring to: http://www.radioshack.com/product.as...5Fid=15%2D1253 Gary E -- |Gary A. Edelstein (remove NO SPAM and .invalid to reply) |"We have met the enemy and he is us." - Walt Kelly's Pogo |
#6
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"Nathan Gutman" wrote in message
... I have a JVC MX-J50. The FM antenna seems to be just a piece a wire. I would like to listen to a local FM station on 90.5 MHz. This station is hard to receive. When I touch the wire to reposition it the station comes in clearly as soon as I let go of the wire it disappears. Can someone patiently explain to me all that and how to get to work. What kind of indoor antenna can I make or buy to get this station? Thanks. You can try a folded dipole antenna. These are made of twin lead and have a T shape. They are cheap. Connect it to the 300 Ohm connectors if possible or use a 300 to 75 Ohm transformer. If you know the general direction of the signal, adjust the antenna so that the horizontal part of the T is perpendicular to the signal. You may need to move the antenna around due to multipath and shading effects. John |
#7
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Yes, looks exactly like what I was going to make. It doesn't give the
length of the lead-in section. According to my calculations for a 90.5mhz I need an 62" element. Radio Shack specs say 58" element which is good for about 96.8mhz. Do you think this will have any serious adverse effect? On Thu, 02 Jun 2005 14:56:47 -0500, Gary A. Edelstein wrote: On Thu, 02 Jun 2005 16:02:45 GMT, Nathan Gutman wrote: I found instructions to design and make a simple antenna for the frequency I want to receive out of 300ohm twin lead-in wire. The receiver needs a 75ohm antenna. Do I need a matching transformer? I see that Radio Shack has one for $3.99. Yes, get a transformer if the radio receiver only has a 75 ohm F connector. Do the plans have you make this sort of diapole? That's the antenna you want. http://www.radioshack.com/product.as...5Fid=42%2D2385 This is the transformer I believe you need and are referring to: http://www.radioshack.com/product.as...5Fid=15%2D1253 Gary E |
#8
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Do we know what kind of antenna connector this has?
If any? It could be just a captive wire hanging out the back. |
#9
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There are two connections: one labeled FM 75ohm and the other is
"ground". Right now I have a single wire about 10 feet long hanging from the FM 75ohm connection. I manipulated that wire to be able to hear the 90.5mhz station but the reception is very poor. On Thu, 2 Jun 2005 16:23:41 -0700, "Richard Crowley" wrote: Do we know what kind of antenna connector this has? If any? It could be just a captive wire hanging out the back. |
#10
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"Nathan Gutman" wrote ...
There are two connections: one labeled FM 75ohm and the other is "ground". Right now I have a single wire about 10 feet long hanging from the FM 75ohm connection. I manipulated that wire to be able to hear the 90.5mhz station but the reception is very poor. 1) Try just making the wire longer and experiment with moving it around. You just get lucky for little or no cost. 2) Get an "FM antenna" from any number of places. Radio Shack sells dozens of different things, most of which would likely improve your reception. Of course if we knew the power, terrain and distance, it would be easier to recommend something more appropriate. What are the call-letters of the station? Where are you? (City & State) |
#11
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In article ,
Steve Urbach wrote: On Thu, 02 Jun 2005 14:04:58 GMT, Nathan Gutman wrote: I have a JVC MX-J50. The FM antenna seems to be just a piece a wire. I would like to listen to a local FM station on 90.5 MHz. This station is hard to receive. When I touch the wire to reposition it the station comes in clearly as soon as I let go of the wire it disappears. Can someone patiently explain to me all that and how to get to work. What kind of indoor antenna can I make or buy to get this station? Thanks. US FK sits (along with othe services) between TV channels 6 and 7. Almost any VHF (2-13) TV antenna would work. Not necesarily true. There's a "third harmonic" relationship between channels 2-6 and channels 7-13 that makes it attractive to design antennas that do just fine for all the VHF TV channels while being rather insensitive to the 88-108 MHz FM band. You can always try an existing TV antenna to see how well it works, but if you're buying new, it's possible to find ones specifically designed to include the FM frequencies. Isaac |
#12
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As a good make-it-yourself antenna, try a 30-inch piece of wire, straight
up. Or possibly oriented some other way. |
#13
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Nathan Gutman writes:
I have a JVC MX-J50. The FM antenna seems to be just a piece a wire. I would like to listen to a local FM station on 90.5 MHz. This station is hard to receive. When I touch the wire to reposition it the station comes in clearly as soon as I let go of the wire it disappears. When you touch the antenna, your presence there has considerable effect on the antenna operation, and when you let go that effect dissappears. The effect that you can have to the antenna is chage it's tuning by the your capacitance, you acting as extra part of antenna picking more signal or you acting as some kind of reflector that reflects more signal to antenna.. Dpending your position, reeivign conditions and antenna design you touchign the antenna can make th reception consierably worse or better. Can someone patiently explain to me all that and how to get to work. What kind of indoor antenna can I make or buy to get this station? The FM dipole antenna is economical and relatively simple to install, whilst offering a considerable increase in reception quality compared to "just a piece of wire" antennas. You just hang this kind of dipole to your wall or window, etc.. The best quality FM radio receiver system for weak stations consists of a directional FM antenna, permanently erected externally and pointing to the FM station transmitter you want to listen to. This kind of FM antenna is very much like a VHF television antenna, just sligtly different in the constrution (optimized for FM band operation instead of TV channel frequencies). Some links on the topics: FM Antennas http://www.abc.net.au/reception/radio/fm_antenna.htm FM Dipole for 88-108 MHz http://www.northcountryradio.com/Articles/fmdip.htm AXIS 7945 FM Dipole Antenna http://electrogalaxy.dtopinc.com/ind...object=an85001 FM DIPOLE ANTENNA http://www.ecreso.com/uk/docs/D_DLBFM5_uk.pdf -- Tomi Engdahl (http://www.iki.fi/then/) Take a look at my electronics web links and documents at http://www.epanorama.net/ |
#14
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On Thu, 02 Jun 2005 22:11:48 GMT, Nathan Gutman
wrote: Yes, looks exactly like what I was going to make. It doesn't give the length of the lead-in section. According to my calculations for a 90.5mhz I need an 62" element. Radio Shack specs say 58" element which is good for about 96.8mhz. Do you think this will have any serious adverse effect? I doubt it. Go for it. Gary E -- |Gary A. Edelstein (remove NO SPAM and .invalid to reply) |"We have met the enemy and he is us." - Walt Kelly's Pogo |
#15
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On Thu, 2 Jun 2005 18:51:33 -0700, "Richard Crowley"
wrote: "Nathan Gutman" wrote ... There are two connections: one labeled FM 75ohm and the other is "ground". Right now I have a single wire about 10 feet long hanging from the FM 75ohm connection. I manipulated that wire to be able to hear the 90.5mhz station but the reception is very poor. 1) Try just making the wire longer and experiment with moving it around. You just get lucky for little or no cost. I moved the wire around incredibly through a doorway, around a wall and the reception is good. If I move portion of the wire just a few inches I lose the reception. Incredible! 2) Get an "FM antenna" from any number of places. Radio Shack sells dozens of different things, most of which would likely improve your reception. Of course if we knew the power, terrain and distance, it would be easier to recommend something more appropriate. What are the call-letters of the station? Where are you? (City & State) The station is an NPR station WPKT and I am in Simsbury, CT. It's website says that their signal is supposed to be strong here. |
#16
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On Sat, 04 Jun 2005 00:17:48 GMT, Nathan Gutman
wrote: On Thu, 2 Jun 2005 18:51:33 -0700, "Richard Crowley" wrote: "Nathan Gutman" wrote ... There are two connections: one labeled FM 75ohm and the other is "ground". Right now I have a single wire about 10 feet long hanging from the FM 75ohm connection. I manipulated that wire to be able to hear the 90.5mhz station but the reception is very poor. 1) Try just making the wire longer and experiment with moving it around. You just get lucky for little or no cost. I moved the wire around incredibly through a doorway, around a wall and the reception is good. If I move portion of the wire just a few inches I lose the reception. Incredible! 2) Get an "FM antenna" from any number of places. Radio Shack sells dozens of different things, most of which would likely improve your reception. Of course if we knew the power, terrain and distance, it would be easier to recommend something more appropriate. What are the call-letters of the station? Where are you? (City & State) The station is an NPR station WPKT and I am in Simsbury, CT. It's website says that their signal is supposed to be strong here. Building insulation with foil attenuates and also reflects signals. There is a chance of finding the perfect WRONG place inside :/ Outdoor antennas have a better chance of suppling a better signal unless you live in a concrete (and iron) jungle. , _ , | \ MKA: Steve Urbach , | )erek No JUNK in my email please , ____|_/ragonsclaw , / / / Running United Devices "Cure For Cancer" Project 24/7 Have you helped? http://www.grid.org |
#17
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The station is an NPR station WPKT and I am in Simsbury, CT. It's website says that their signal is supposed to be strong here. Most NPR stations have rather low power. Also, there can be "dead spots" in any city or building. |
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