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#1
Posted to rec.woodworking
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O/T: Folded Dipole
After more than 20+ years of service, my analog TV died.
Since the switch to digital is coming, got an LCD as a replacement. Unboxed the new unit, plugged in the power and the existing folded dipole antenna. Followed the set up instructions, unit works like a champ. That folded dipole took about 20 minutes time and less than $0.10 of 300 ohm twin lead to build. So much for overpriced antennas and cable. Lew |
#2
Posted to rec.woodworking
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O/T: Folded Dipole
On Apr 20, 11:27*pm, "Lew Hodgett" wrote:
After more than 20+ years of service, my analog TV died. Since the switch to digital is coming, got an LCD as a replacement. Unboxed the new unit, plugged in the power and the existing folded dipole antenna. Followed the set up instructions, unit works like a champ. That folded dipole took about 20 minutes time and less than $0.10 of 300 ohm twin lead to build. So much for overpriced antennas and cable. Lew Do you have a link that shows how to make one of these? I have some extra cable sitting around and our current antenna isn't very good. -Nathan |
#3
Posted to rec.woodworking
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O/T: Folded Dipole
"nhurst" wrote: Do you have a link that shows how to make one of these? No, but it is simple enough to build. 1) Cut a piece of 300 ohm twin lead 60" long. 2) Solder ends together on each end to form a continuous circle. 3) At exactly the mid-point, cut one of the leads in half. 4) Solder a piece of 300 ohm twin lead at the cut side, thus forming the antenna lead wire to TV set. Stretch wire along a wall and attach to wall with a couple of straight pins, then attach lead to TV. Enjoy. Lew .. |
#4
Posted to rec.woodworking
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O/T: Folded Dipole
"Lew Hodgett" wrote in message ... "nhurst" wrote: Do you have a link that shows how to make one of these? No, but it is simple enough to build. 1) Cut a piece of 300 ohm twin lead 60" long. 2) Solder ends together on each end to form a continuous circle. 3) At exactly the mid-point, cut one of the leads in half. 4) Solder a piece of 300 ohm twin lead at the cut side, thus forming the antenna lead wire to TV set. Stretch wire along a wall and attach to wall with a couple of straight pins, then attach lead to TV. The dipole you discribe is cut for VHF low. The new digital frequencies are on UHF. You'll need to make a new antenna. |
#5
Posted to rec.woodworking
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O/T: Folded Dipole
"CW" wrote:
The dipole you discribe is cut for VHF low. The new digital frequencies are on UHF. You'll need to make a new antenna. Seems to be working just fine, especially on the UHF channels. Matter of fact, digital UHF is much better than analog UHF was. Lew |
#6
Posted to rec.woodworking
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O/T: Folded Dipole
Lew Hodgett wrote:
.... Matter of fact, digital UHF is much better than analog UHF was. .... If you have enough signal level to have digital, that's generally true. Otoh, when there isn't enough you have nothing w/ digital where analog was probably still just snowy/ghosty but at least visible. So far here we're 1 for 2; the other two have delayed 'til the June witching date. When they make the switch, then I'll investigate what it'll take to get 'em all if it's within reason; 'til then I'll just do w/o the PBS. Discussion w/ their engineer wasn't promising that they thought would have a signal (and didn't really seem to give a flip, either, of course). -- |
#7
Posted to rec.woodworking
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O/T: Folded Dipole
"Lew Hodgett" writes:
"CW" wrote: The dipole you discribe is cut for VHF low. The new digital frequencies are on UHF. You'll need to make a new antenna. Seems to be working just fine, especially on the UHF channels. Matter of fact, digital UHF is much better than analog UHF was. As long as the signal is strong. When the signal is weak, the picture doesn't just get "fuzzy." |
#8
Posted to rec.woodworking
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O/T: Folded Dipole
CW wrote:
"Lew Hodgett" wrote in message ... "nhurst" wrote: Do you have a link that shows how to make one of these? No, but it is simple enough to build. 1) Cut a piece of 300 ohm twin lead 60" long. 2) Solder ends together on each end to form a continuous circle. 3) At exactly the mid-point, cut one of the leads in half. 4) Solder a piece of 300 ohm twin lead at the cut side, thus forming the antenna lead wire to TV set. Stretch wire along a wall and attach to wall with a couple of straight pins, then attach lead to TV. The dipole you discribe is cut for VHF low. The new digital frequencies are on UHF. You'll need to make a new antenna. There are no "new digital frequencies". There are different channel assignments but the frequencies are the same as for analog TV, except that for digital there are fewer of them since the FCC has chosen to divert one block of frequencies to other purposes. |
#9
Posted to rec.woodworking
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O/T: Folded Dipole
CW wrote:
"Lew Hodgett" wrote in message ... "nhurst" wrote: Do you have a link that shows how to make one of these? No, but it is simple enough to build. 1) Cut a piece of 300 ohm twin lead 60" long. 2) Solder ends together on each end to form a continuous circle. 3) At exactly the mid-point, cut one of the leads in half. 4) Solder a piece of 300 ohm twin lead at the cut side, thus forming the antenna lead wire to TV set. Stretch wire along a wall and attach to wall with a couple of straight pins, then attach lead to TV. The dipole you discribe is cut for VHF low. The new digital frequencies are on UHF. You'll need to make a new antenna. The top 108Mhz of the UHF band has/is being assigned or auctioned off for other purposes, otherwise all old TV frequencies are the same. However, there may be some stations migrating from VHF to the remaining UHF frequencies. As well, some stations may not alight on their final frequency assignment until the June deadline. Formerly K7OQF from the vacuum tube days. |
#10
Posted to rec.woodworking
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O/T: Folded Dipole
On Tue, 21 Apr 2009 17:09:43 -0700, Doug Winterburn wrote:
The top 108Mhz of the UHF band has/is being assigned or auctioned off for other purposes, otherwise all old TV frequencies are the same. Low VHF (analog channels 2 through 6) likewise. However, there may be some stations migrating from VHF to the remaining UHF frequencies. As well, some stations may not alight on their final frequency assignment until the June deadline. Formerly K7OQF from the vacuum tube days. -- Art Greenberg WA2LLN artg at eclipse dot net |
#11
Posted to rec.woodworking
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O/T: Folded Dipole
Cut a piece of 300 ohm twin lead 60" long
was told that this dimension was related to the bandwidth one expected to receive. If so, wouldn't there be a difference in required length for UHF vs VHS, vs FM, say? . |
#12
Posted to rec.woodworking
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O/T: Folded Dipole
wrote:
was told that this dimension was related to the bandwidth one expected to receive. If so, wouldn't there be a difference in required length for UHF vs VHS, vs FM, say? I'll let any Hams on list answer your question; however, 60" covers everthing including FM in my area. SFWIW, Radio Shack sells a factory made unit which is 60". Lew |
#13
Posted to rec.woodworking
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O/T: Folded Dipole
"Lew Hodgett" wrote in message
... wrote: was told that this dimension was related to the bandwidth one expected to receive. If so, wouldn't there be a difference in required length for UHF vs VHS, vs FM, say? I'll let any Hams on list answer your question; however, 60" covers everthing including FM in my area. SFWIW, Radio Shack sells a factory made unit which is 60". The "accepted" (on FCC tests) simplified equation for a half-wave dipole wire length is: feet = 468/MHz. A folded dipole simply folds each leg of the dipole back to the center. Effectively, the 5' long folded dipole has 10' of wire. Its resonant frequency is thus 46.8 MHz according to the formula. Interestingly, this works out to about a full wave for the 100 MHz FM band. It might be worth experimenting with slightly shorter lengths, moving the resonant frequency to, say, 75 MHz. The gains will be minimal, if measurable at all (let alone noticeable). The simplified formula differs from the theoretical value in a vacuum by the velocity factor of the wire, in this case apparently about 95% (from 492/MHz in a vacuum). I wouldn't worry much about it. The antenna's resonant frequency is not nearly so important for receive-only operations as it is for transmitters. A mismatch on a transmitter presents a very high impedance, causing the feedline to also radiate, and plays all kinds of havoc to equipment in the vicinity. A dipole is also somewhat directional, with about 2 dB of gain in its broadside direction compared to a point radiator. This implies the same 2 dB attenuation in its side lobes, off the ends. Given a choice, I would face the antenna toward the signal and the ends toward the local RF noise. However, if reception is so marginal that this is enough to make or break the chain, consider it broken and get a tuned, multi-element, directional antenna. The same goes fiddling with the wire length. |
#14
Posted to rec.woodworking
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Folded Dipole
"Lew Hodgett" wrote in message ... After more than 20+ years of service, my analog TV died. Since the switch to digital is coming, got an LCD as a replacement. Unboxed the new unit, plugged in the power and the existing folded dipole antenna. Followed the set up instructions, unit works like a champ. That folded dipole took about 20 minutes time and less than $0.10 of 300 ohm twin lead to build. So much for overpriced antennas and cable. Lew Remember way back when the TV experts in the stores preached that you need a COLOR TV antenna for best reception on one of those NEW style Color TV's? They are at it again with the Digital TV's. Our 15 year old rabbit ear antenna works fine on our LCD. I believe that perhaps an old out doors antenna that has been fighting the elements may be out done by a brand new antenna but the digital signal requires no better antenna than analog as you well know. |
#15
Posted to rec.woodworking
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Folded Dipole
"Leon" wrote in message ... Remember way back when the TV experts in the stores preached that you need a COLOR TV antenna for best reception on one of those NEW style Color TV's? They are at it again with the Digital TV's. Our 15 year old rabbit ear antenna works fine on our LCD. I believe that perhaps an old out doors antenna that has been fighting the elements may be out done by a brand new antenna but the digital signal requires no better antenna than analog as you well know. With the change to digital comes new frequencies. Your rabbit ears are designed for VHF. The digital transmissions are on UHF. If you are in a strong signal area, your rabbit ears may continue to work. If not, you will need a new antenna. |
#16
Posted to rec.woodworking
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Folded Dipole
"CW" wrote in message m... "Leon" wrote in message ... Remember way back when the TV experts in the stores preached that you need a COLOR TV antenna for best reception on one of those NEW style Color TV's? They are at it again with the Digital TV's. Our 15 year old rabbit ear antenna works fine on our LCD. I believe that perhaps an old out doors antenna that has been fighting the elements may be out done by a brand new antenna but the digital signal requires no better antenna than analog as you well know. With the change to digital comes new frequencies. Your rabbit ears are designed for VHF. The digital transmissions are on UHF. If you are in a strong signal area, your rabbit ears may continue to work. If not, you will need a new antenna. I get about 30 channels in Houston however most of the antennas are about 8 miles away "as the crow flies". Oddly with a similar antenna and with an analog TV the reception for 3 of the 5 major network stations was terrible. I added a $50 digital tuner to that TV and with the same antenna the reception was perfect. My father lives 2 miles from me, added the digital tuner, and a $50 set of "digital" rabbit ears and the reception sucks if you stand too close or too far away. The antenna is located near the ceiling. |
#17
Posted to rec.woodworking
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Folded Dipole
CW wrote:
"Leon" wrote in message ... Remember way back when the TV experts in the stores preached that you need a COLOR TV antenna for best reception on one of those NEW style Color TV's? They are at it again with the Digital TV's. Our 15 year old rabbit ear antenna works fine on our LCD. I believe that perhaps an old out doors antenna that has been fighting the elements may be out done by a brand new antenna but the digital signal requires no better antenna than analog as you well know. With the change to digital comes new frequencies. Your rabbit ears are designed for VHF. The digital transmissions are on UHF. If you are in a strong signal area, your rabbit ears may continue to work. If not, you will need a new antenna. Some digital is on UHF, some on VHF, just as some analog was on UHF and some was on VHF. Nothing new _there_. |
#18
Posted to rec.woodworking
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Folded Dipole
"CW" writes:
"Leon" wrote in message m... Remember way back when the TV experts in the stores preached that you need a COLOR TV antenna for best reception on one of those NEW style Color TV's? They are at it again with the Digital TV's. Our 15 year old rabbit ear antenna works fine on our LCD. I believe that perhaps an old out doors antenna that has been fighting the elements may be out done by a brand new antenna but the digital signal requires no better antenna than analog as you well know. With the change to digital comes new frequencies. Your rabbit ears are designed for VHF. The digital transmissions are on UHF. If you are in a strong signal area, your rabbit ears may continue to work. If not, you will need a new antenna. External rabbit ear antennae have had UHF capabilities for forty years. scott |
#19
Posted to rec.woodworking
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Folded Dipole
"Scott Lurndal" wrote in message m... External rabbit ear antennae have had UHF capabilities for forty years. So do your bedsprings but it doesn't make them efficient. |
#20
Posted to rec.woodworking
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Folded Dipole
"Lew Hodgett" wrote in message ... After more than 20+ years of service, my analog TV died. Since the switch to digital is coming, got an LCD as a replacement. Unboxed the new unit, plugged in the power and the existing folded dipole antenna. Followed the set up instructions, unit works like a champ. That folded dipole took about 20 minutes time and less than $0.10 of 300 ohm twin lead to build. So much for overpriced antennas and cable. Lew I had much the same experience a couple of years ago. Really, now, why would you need a new antenna if the frequencies don't change? Jim |
#21
Posted to rec.woodworking
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Folded Dipole
Jim wrote:
I had much the same experience a couple of years ago. Really, now, why would you need a new antenna if the frequencies don't change? Narrower bandwidth at same or less transmit power results in lower received signal strength. Two other ways of coping with the problem are to use a signal pre-amplifier and using a directional (gain) antenna. I can't pick up PBS even with a pre-amp, so plan to build a quad antenna that should deliver about 21db of forward gain. -- Morris Dovey DeSoto Solar DeSoto, Iowa USA http://www.iedu.com/DeSoto/ |
#22
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Folded Dipole
Morris Dovey wrote:
Jim wrote: I had much the same experience a couple of years ago. Really, now, why would you need a new antenna if the frequencies don't change? Narrower bandwidth at same or less transmit power results in lower received signal strength. Two other ways of coping with the problem are to use a signal pre-amplifier and using a directional (gain) antenna. I can't pick up PBS even with a pre-amp, so plan to build a quad antenna that should deliver about 21db of forward gain. The digital receiver only has to determine if the bit is a "0" or a "1" so the signal doesn't have to be as strong as with an analog receiver. I've got an antenna with a variable pre-amp. Using that antenna I have to turn the gain to minimum to receive anything. Even at minimum some station drop in and out. If I raise the gain I loose the signal completely. I suspect the signal is still being over driven and clipping. A plain old $9 antenna works perfectly on all the stations in my area. -- Jack Novak Buffalo, NY - USA |
#23
Posted to rec.woodworking
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Folded Dipole
"Nova" wrote in message ... Morris Dovey wrote: The digital receiver only has to determine if the bit is a "0" or a "1" so the signal doesn't have to be as strong as with an analog receiver. That's is what I thought but my dad gets a lot of pixilization and slow motion and dropped sound with his digital tuner and TV. I thought you would get all or none way back when. As it turns out with my HD satelite DVR and mostly only with local stations broadcast through satelite I regularially get pixilization. The probpem is nonexistent with the premium satelite channels unless it is raining. I've got an antenna with a variable pre-amp. Using that antenna I have to turn the gain to minimum to receive anything. Even at minimum some station drop in and out. If I raise the gain I loose the signal completely. I suspect the signal is still being over driven and clipping. A plain old $9 antenna works perfectly on all the stations in my area. -- Jack Novak Buffalo, NY - USA |
#24
Posted to rec.woodworking
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Folded Dipole
Nova wrote:
Morris Dovey wrote: Jim wrote: I had much the same experience a couple of years ago. Really, now, why would you need a new antenna if the frequencies don't change? Narrower bandwidth at same or less transmit power results in lower received signal strength. Two other ways of coping with the problem are to use a signal pre-amplifier and using a directional (gain) antenna. I can't pick up PBS even with a pre-amp, so plan to build a quad antenna that should deliver about 21db of forward gain. The digital receiver only has to determine if the bit is a "0" or a "1" so the signal doesn't have to be as strong as with an analog receiver. That may be the theory, but if it misses a few bits you get a black screen while with analog you get a viewable degraded image. I've got an antenna with a variable pre-amp. Using that antenna I have to turn the gain to minimum to receive anything. Even at minimum some station drop in and out. If I raise the gain I loose the signal completely. I suspect the signal is still being over driven and clipping. A plain old $9 antenna works perfectly on all the stations in my area. Lucky you. |
#25
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Folded Dipole
"J. Clarke" wrote in message ... That may be the theory, but if it misses a few bits you get a black screen while with analog you get a viewable degraded image. Are you reading this some where? Do you actually have digital? I have had digital for close to 4 years and if I am getting bad reception the picture is all kinds of terrible, you would swear you were doing mushrooms when this happens. I've got an antenna with a variable pre-amp. Using that antenna I have to turn the gain to minimum to receive anything. Even at minimum some station drop in and out. If I raise the gain I loose the signal completely. I suspect the signal is still being over driven and clipping. A plain old $9 antenna works perfectly on all the stations in my area. Lucky you. |
#26
Posted to rec.woodworking
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Folded Dipole
Nova writes:
Morris Dovey wrote: Jim wrote: I had much the same experience a couple of years ago. Really, now, why would you need a new antenna if the frequencies don't change? Narrower bandwidth at same or less transmit power results in lower received signal strength. Two other ways of coping with the problem are to use a signal pre-amplifier and using a directional (gain) antenna. I can't pick up PBS even with a pre-amp, so plan to build a quad antenna that should deliver about 21db of forward gain. The digital receiver only has to determine if the bit is a "0" or a "1" so the signal doesn't have to be as strong as with an analog receiver. The digital receiver _first_ must convert the modulation of an analog carrier to the '0' or '1' instead of converting the modulation into an analog NTSC signal. This is the step where the S/N ratio matters. scott |
#27
Posted to rec.woodworking
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Folded Dipole
"Scott Lurndal" wrote in message m... The digital receiver _first_ must convert the modulation of an analog carrier to the '0' or '1' instead of converting the modulation into an analog NTSC signal. This is the step where the S/N ratio matters. scott That gets me to thinking. I have DirecTV on 2 televisions. From the same HD dish goes a lead to the HD DVR to a HD LCD, also to a analog DVR to an analog TV. Reception on the analog DVR and TV are basically perfect unless the weather is poor, **** poor. Almost daily my HD DVR and HD LCD TV and my neighbor, BIL, and father's SAME setup have periods of bad reception on any of the major local networks. I wonder if DirecTV is currently converting an analog signal from these stations to digital and if that could be the problem. On a 3rd going from a rabbit ear antenna to a CHEAP digital converter to an analog TV produces great results day in and day out. Non local HD channels do fine. DirecTV cannot figure out the problem nor can the installers on any of the 7 or 8 times that they have come out to replace the dish or HD DVR. |
#28
Posted to rec.woodworking
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Folded Dipole
Scott Lurndal wrote:
Nova writes: The digital receiver only has to determine if the bit is a "0" or a "1" so the signal doesn't have to be as strong as with an analog receiver. The digital receiver _first_ must convert the modulation of an analog carrier to the '0' or '1' instead of converting the modulation into an analog NTSC signal. This is the step where the S/N ratio matters. scott I'm not familiar with the set up for digital TV but I was a TELCO data transmission specialist for quite a few years. With DOV/DUV (data over voice/data under voice) the S/N ratio seldom cause problems with the data, unless the noise was severe, while it would greatly impact the modulated analog signals. Phase jitter on the other hand would wipe out the data with little impact on the analog. The same help true for the Async data using 2024, 2028 and 2029 modems. -- Jack Novak Buffalo, NY - USA |
#29
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Folded Dipole
Morris Dovey wrote:
Jim wrote: I had much the same experience a couple of years ago. Really, now, why would you need a new antenna if the frequencies don't change? Narrower bandwidth at same or less transmit power results in lower received signal strength. Two other ways of coping with the problem are to use a signal pre-amplifier and using a directional (gain) antenna. I can't pick up PBS even with a pre-amp, so plan to build a quad antenna that should deliver about 21db of forward gain. The following web site allows you to input your zip code (the only information REQUIRED), indicate if there are obstructions in your area and tell the calculator what type of structure the building is and the site will provide a chart of the stations in your area and what type of antenna is required for each station. http://www.antennaweb.org/aw/welcome.aspx also see: http://www.fcc.gov/cgb/consumerfacts/dtvantennas.html -- Jack Novak Buffalo, NY - USA |
#30
Posted to rec.woodworking
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Folded Dipole
On Tue, 21 Apr 2009 10:18:09 -0500, Morris Dovey
wrote: I can't pick up PBS even with a pre-amp, so plan to build a quad antenna that should deliver about 21db of forward gain. Here's a link to the now famous coat hanger antenna. http://www.youtube.com/watch?v=EWQhlmJTMzw There are a couple variations of this but this is the basic idea. It's mostly a UHF antenna but some guys get upper VHF channels especially with an added reflector. That version builds the bowties on one edge of a 2x4 with a piece of plywood (or cardboard) covered with foil attached to the other edge. You can also combine 2 for more gain and some guys are mounting them on a rotor. I built one and set it the back yard and it worked just fine. I used pieces of romex I found laying around the jobsite for the bowties. I haven't fished a wire from the basement to the attic yet so now it's hanging in the floor truss space for emergencies. Basically that's at ground level and it even works there. You can buy practically the same antenna for not a whole lot of money but where's the fun in that? Mike O. |
#31
Posted to rec.woodworking
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Folded Dipole
Mike O. wrote:
On Tue, 21 Apr 2009 10:18:09 -0500, Morris Dovey wrote: I can't pick up PBS even with a pre-amp, so plan to build a quad antenna that should deliver about 21db of forward gain. Here's a link to the now famous coat hanger antenna. http://www.youtube.com/watch?v=EWQhlmJTMzw There are a couple variations of this but this is the basic idea. It's mostly a UHF antenna but some guys get upper VHF channels especially with an added reflector. That version builds the bowties on one edge of a 2x4 with a piece of plywood (or cardboard) covered with foil attached to the other edge. You can also combine 2 for more gain and some guys are mounting them on a rotor. I built one and set it the back yard and it worked just fine. I used pieces of romex I found laying around the jobsite for the bowties. I haven't fished a wire from the basement to the attic yet so now it's hanging in the floor truss space for emergencies. Basically that's at ground level and it even works there. You can buy practically the same antenna for not a whole lot of money but where's the fun in that? I'll probably build a seven-element quad much like the 2m (146 MHz) antenna that let me check into a Rhode Island FM repeater net from my Minnesota home using a 14W transceiver. Swingman helped me draw the hubs with SU a while back. :-) -- Morris Dovey DeSoto Solar DeSoto, Iowa USA http://www.iedu.com/DeSoto/ |
#32
Posted to rec.woodworking
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Folded Dipole
"Morris Dovey" wrote in message
... I'll probably build a seven-element quad much like the 2m (146 MHz) antenna that let me check into a Rhode Island FM repeater net from my Minnesota home using a 14W transceiver. Swingman helped me draw the hubs with SU a while back. :-) SU is the bomb! But how did he work around the line of sight problem? |
#33
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Folded Dipole
On Tue, 21 Apr 2009 22:16:45 -0500, Morris Dovey wrote:
I'll probably build a seven-element quad much like the 2m (146 MHz) antenna that let me check into a Rhode Island FM repeater net from my Minnesota home using a 14W transceiver. Tropo duct, no doubt. I think the bandwidth of that quad is going to be a bit narrow for even one digital channel, let alone a whole range of channels. You ought to be able to put together a simple log-periodic yagi that would likely do much better. Hmmm... what would a log-period quad look like? -- Art Greenberg WA2LLN artg at eclipse dot net |
#34
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Folded Dipole
On Tue, 21 Apr 2009 10:01:26 -0500, "Jim" wrote:
"Lew Hodgett" wrote in message ... After more than 20+ years of service, my analog TV died. Since the switch to digital is coming, got an LCD as a replacement. Unboxed the new unit, plugged in the power and the existing folded dipole antenna. Followed the set up instructions, unit works like a champ. That folded dipole took about 20 minutes time and less than $0.10 of 300 ohm twin lead to build. So much for overpriced antennas and cable. Lew I had much the same experience a couple of years ago. Really, now, why would you need a new antenna if the frequencies don't change? Jim Because with digital TV you need more signal to get any picture at all compared to analog. If the signal is just below the threshold, you get a totally useless picture or no picture at all. With analog, the same picture would just have a bit of snow. Having said that, the "new better digital" antennas are not different than antennas before digital. You just *may* need one with more gain to get a picture. |
#35
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Folded Dipole
"Jim" wrote in message
... "Lew Hodgett" wrote in message ... After more than 20+ years of service, my analog TV died. Since the switch to digital is coming, got an LCD as a replacement. Unboxed the new unit, plugged in the power and the existing folded dipole antenna. Followed the set up instructions, unit works like a champ. That folded dipole took about 20 minutes time and less than $0.10 of 300 ohm twin lead to build. So much for overpriced antennas and cable. Lew I had much the same experience a couple of years ago. Really, now, why would you need a new antenna if the frequencies don't change? Jim Shoot. I live so far out in the burbs that a folded dipole gets only a few FM radio stations. Rabbit ears get only WGN (the station, of course, and also white gaussian noise elsewise). There's a 20 year old, normal, ordinary log periodic TV antenna lying in the attic, that hasn't been used in 19.9 years. It would probably work well enough if I mounted it outside where it belongs, but it serves a useful purpose right now broadbanding the half wave 20m dipole, also inside, so it tunes enough to transmit on 40m and 15m. We've been on cable and dish since long ago, all digital for at least half that. Not everyone lives close to the city center. |
#36
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Folded Dipole
MikeWhy wrote:
.... ...Not everyone lives close to the city center. Not everyone lives remotely close to a city fringe... -- |
#37
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Folded Dipole
Jim wrote:
"Lew Hodgett" wrote in message ... After more than 20+ years of service, my analog TV died. Since the switch to digital is coming, got an LCD as a replacement. Unboxed the new unit, plugged in the power and the existing folded dipole antenna. Followed the set up instructions, unit works like a champ. That folded dipole took about 20 minutes time and less than $0.10 of 300 ohm twin lead to build. So much for overpriced antennas and cable. Lew I had much the same experience a couple of years ago. Really, now, why would you need a new antenna if the frequencies don't change? Because the signal strength is much less than previously and the digital signal dies under multipath conditions that would not even be noticeable with an analog signal. Jim |
#38
Posted to rec.woodworking
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Folded Dipole
On Tue, 21 Apr 2009 18:47:59 +0100, J. Clarke wrote
(in article ): Because the signal strength is much less than previously and the digital signal dies under multipath conditions that would not even be noticeable with an analog signal. Ahhh.. that's the digital difference, it's very much an "it is or it isn't" situation from the signal stream right down to end user satisfaction. Some sort of fractal logic at work here, perchance, the microcosm implicit in the macrocosm - the opposite of ironic? In Britain it's become some sort of elitist game. I know plenty of people with NO worthwhile terrestrial signal unless they hang on to their five channels of analogue reception while others have a gerzillion channels of sparkling, crystal-clear worthless junk. It's going to be quite bloody when the all-noing government pulls the plug on all analogue broadcasts. Some rural areas are either going to have to go satellite or run 60-foot poles up on top of their picturesque cottages. My mother-in-law lives maybe 10 miles from a transmitter but is in a reception shadow (hilly terrain.) Like everyone else in her area, she has the digital box and an expensive new antenna rig but still watches analogue because the reception is great, channel switching is instantaneous and she is comfortable with her traditional stations and has no desire for forty channels of manga. I had a play with her set and it takes maybe 20 seconds to change from one channel to another to find out that it's something you don't want to watch.. Channel surfing is effectively impossible, and the "guide" takes just as long to scroll through.. each line takes about 20 seconds to refresh. Everyone in the village is in a similar situation, so it's not just the senile old bat going luddite with the technik. Progress There are 10 types of people in the world: Those who understand bananary and those who prefer a straight answer..... |
#39
Posted to rec.woodworking
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Folded Dipole
"Jim" wrote in message ... "Lew Hodgett" wrote in message ... After more than 20+ years of service, my analog TV died. Since the switch to digital is coming, got an LCD as a replacement. Unboxed the new unit, plugged in the power and the existing folded dipole antenna. Followed the set up instructions, unit works like a champ. That folded dipole took about 20 minutes time and less than $0.10 of 300 ohm twin lead to build. So much for overpriced antennas and cable. Lew I had much the same experience a couple of years ago. Really, now, why would you need a new antenna if the frequencies don't change? Jim You would't but the frequencies WILL change. |
#40
Posted to rec.woodworking
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Folded Dipole
"CW" wrote in message m... "Jim" wrote in message ... "Lew Hodgett" wrote in message ... After more than 20+ years of service, my analog TV died. Since the switch to digital is coming, got an LCD as a replacement. Unboxed the new unit, plugged in the power and the existing folded dipole antenna. Followed the set up instructions, unit works like a champ. That folded dipole took about 20 minutes time and less than $0.10 of 300 ohm twin lead to build. So much for overpriced antennas and cable. Lew I had much the same experience a couple of years ago. Really, now, why would you need a new antenna if the frequencies don't change? Jim You would't but the frequencies WILL change. I was wondering how they get those subchannels. I live about 50 miles from the transmitter tower. The analog TVs were never able to get consistent signals from the UHF stations. Now, however, these stations come in quite well. But, since nothing is broken here, there is nothing to fix (yet). Jim |
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