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#1
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Turning a 1/4 wave vertical upside down
"amdx" wrote in message ... The receive area is small, 120" x 115", the antenna will be mounted 13" in from the long dimension and 16" in from the smaller dimension, basically in the corner of the lot, mounted 16 ft high. Jeff, at this point, I have convinced myself putting a gain antenna on the roof will solve any problem I may have. If not I can still remove 6db of attenuation. So unless you want some mental exercise, don't over do it! I am sure you mean feet ' instead of inches ". Without doing the math, I would think that 150 feet would be the most you would need out of the system. What is wrong with a horizontal dipole ? It should cover the area just fine, and if not take out those attuenuators. I am not up on all the part 15 rules, but I was thinking 100 milliwatts was fine to run. If you can't hear it 200 feet away, I doubt the FCC is going to worry about it with all the other things they have going on. Could that buzzing noise you hear be some other signal such as cable leakage or the AC power lines line noise ? |
#2
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Turning a 1/4 wave vertical upside down
On 12/1/2013 6:21 PM, Ralph Mowery wrote:
"amdx" wrote in message ... The receive area is small, 120" x 115", the antenna will be mounted 13" in from the long dimension and 16" in from the smaller dimension, basically in the corner of the lot, mounted 16 ft high. Jeff, at this point, I have convinced myself putting a gain antenna on the roof will solve any problem I may have. If not I can still remove 6db of attenuation. So unless you want some mental exercise, don't over do it! I am sure you mean feet ' instead of inches ". Without doing the math, I would think that 150 feet would be the most you would need out of the system. What is wrong with a horizontal dipole ? It should cover the area just fine, and if not take out those attuenuators. I am not up on all the part 15 rules, but I was thinking 100 milliwatts was fine to run. If you can't hear it 200 feet away, I doubt the FCC is going to worry about it with all the other things they have going on. I don't think so either, I just want to do the job with minimum power. Now that I've messed with the new 110 Mhz filter a bit, I might remove one 3 db attenuator and see how it works around the yard. Could that buzzing noise you hear be some other signal such as cable leakage or the AC power lines line noise ? I think it's 60 hertz or a harmonic, but with enough RF, I don't think I'd hear it. It seemed better, after I added my LPF, I don't think because of the filtering but maybe impedance changes. Mikek |
#3
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Turning a 1/4 wave vertical upside down
On Sun, 1 Dec 2013 19:21:19 -0500, "Ralph Mowery"
wrote: Could that buzzing noise you hear be some other signal such as cable leakage or the AC power lines line noise ? Trivia: Cable leakage has changed over the last few years. The sync buzz of the analog TV era has been replaced by digital hiss. Put a temporary antenna on your cable connection and listen on a suitable receiver. Some cable systems still carry FM broadcast stations, so he might also be hearing those coming from a cable leak. Locally, everything was moved to digital channels in 2005. http://www.sfgate.com/business/article/Comcast-to-restore-30-FM-radio-stations-Some-2625920.php "Any sufficiently advanced communications technology is indistiguishable from noise" (appologies to Arthur C. Clarke). -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#4
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Turning a 1/4 wave vertical upside down
"Jeff Liebermann" wrote in message Trivia: Cable leakage has changed over the last few years. The sync buzz of the analog TV era has been replaced by digital hiss. Put a temporary antenna on your cable connection and listen on a suitable receiver. Some cable systems still carry FM broadcast stations, so he might also be hearing those coming from a cable leak. Locally, everything was moved to digital channels in 2005. http://www.sfgate.com/business/article/Comcast-to-restore-30-FM-radio-stations-Some-2625920.php I guess it depends on where you are Jeff. Around where I live there about 100 channels that are still analog. Still starting at the old channel 2. The state I live in is still way behind times. |
#5
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Turning a 1/4 wave vertical upside down
On Mon, 2 Dec 2013 00:00:37 -0500, "Ralph Mowery"
wrote: "Jeff Liebermann" wrote in message Trivia: Cable leakage has changed over the last few years. The sync buzz of the analog TV era has been replaced by digital hiss. Put a temporary antenna on your cable connection and listen on a suitable receiver. Some cable systems still carry FM broadcast stations, so he might also be hearing those coming from a cable leak. Locally, everything was moved to digital channels in 2005. http://www.sfgate.com/business/article/Comcast-to-restore-30-FM-radio-stations-Some-2625920.php I guess it depends on where you are Jeff. Around where I live there about 100 channels that are still analog. Still starting at the old channel 2. Comcast is now all digital in the People's Republic of Santa Cruz CA. Of course Comcast has a new scam. You get up to two "free" DTA boxes: http://customer.comcast.com/Pages/FAQViewer.aspx?seoid=What-is-a-digital-adapter for listening to FM and viewing non-HD channels. It was originally announced that it was "free" for 2 years, but Comcast started adding $5/month per box to some peoples bills in about June. One problem is that the DTA box somehow manages to produce worse than analog quality TV pictures. Digital in, garbage out. I don't know how they managed it, but the "free" box produces some of the worst looking pictures I have ever seen since the introduction of color TV. The Comcast solution is to rent a similar box, that produces HD video, and amazingly produces decent looking non-HD video for $10/month. That's $120/year per TV set for what used to be free: http://bgr.com/2013/10/16/comcast-digital-adapter-criticism/ https://www.google.com/search?q=comcast+dta&tbm=isch Oddly, both types of DTA boxes use the same digital data for non-HD stations, so it's not Comcast that's sending garbage video. It's the DTA box. Both types of boxes will play some local FM stations, but I've only tried it on the HD version. Works fine but will vary by area. For Santa Cruz, we get about 30 stations. The state I live in is still way behind times. That may not be such a bad thing. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#6
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Turning a 1/4 wave vertical upside down
"Jeff Liebermann" wrote in message ... Comcast is now all digital in the People's Republic of Santa Cruz CA. Of course Comcast has a new scam. You get up to two "free" DTA boxes: http://customer.comcast.com/Pages/FAQViewer.aspx?seoid=What-is-a-digital-adapter for listening to FM and viewing non-HD channels. It was originally announced that it was "free" for 2 years, but Comcast started adding $5/month per box to some peoples bills in about June. One problem is that the DTA box somehow manages to produce worse than analog quality TV pictures. Digital in, garbage out. I don't know how they managed it, but the "free" box produces some of the worst looking pictures I have ever seen since the introduction of color TV. The Comcast solution is to rent a similar box, that produces HD video, and amazingly produces decent looking non-HD video for $10/month. That's $120/year per TV set for what used to be free: http://bgr.com/2013/10/16/comcast-digital-adapter-criticism/ https://www.google.com/search?q=comcast+dta&tbm=isch Oddly, both types of DTA boxes use the same digital data for non-HD stations, so it's not Comcast that's sending garbage video. It's the DTA box. I have an old cable ready TV that gets close to 100 of the analog chanels. Just to see if it would work, I hooked up one of the off the air digital converter boxes up to the cable an it did not pick up anything. Guess that lets that out if our area goes to all digital. A newer TV gets the analog and digital chanels off the cable. Then I have one of the boxes hooked to the main TV.. If my wife could operate things, I would go to something like Netflix. The box does work off the air and I get about 30 chanels off the air with an antenna out side the house. |
#7
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Turning a 1/4 wave vertical upside down
On Tue, 3 Dec 2013 23:37:43 -0500, "Ralph Mowery"
wrote: A newer TV gets the analog and digital chanels off the cable. Then I have one of the boxes hooked to the main TV.. If my wife could operate things, I would go to something like Netflix. For Netflix, there are a variety of options. Computer, game box, media player, tablet computers, and built into the TV. For your wife, I suggest you try one of the Roku media players: http://www.roku.com/products/compare I have an older Roku 2 XS box and use it for Netflix. The remote control has only a few buttons, so it's fairly easy to learn. The difficult part is searching for shows to watch. I like to do that on a computah, where I can type in the name of the program on a real keyboard. You can plug in a keyboard into the Roku box, but that might add too much complexity. When I find something worth watching, I add it to my "favorites" list, which appears at the top of the screen when selecting shows on Netflix. What's really nice about Netflix is the total lack of commercials. Last week, one of my customers bought an Xbox One gizmo at Costco. Nifty system which can be voice controlled. All he has to do is say "Xbox show Netflix" and it's up. However, within Netflix, he has to use the included remote control. With the cable box, he can go directly to his favorite channel. "Xbox show TCM" will bring up Turner Classic Movies. If your wife can handle voice commands, it might be an (expensive) option. Marginally related RF drivel: One of my friends is avid DX'er. He has all his media and computer gizmos interconnected via Wi-Fi because Wi-Fi creates less RFI than ethernet. Then, he asks me to figure out why his wi-fi is so slow. None of the computers caused problems, but running Netflix in full 1080p was what was killing his wireless. My solution was to sell him a dual band wireless router, and reserve the 5GHz band for video. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#8
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Turning a 1/4 wave vertical upside down
On 12/16/2013 2:43 AM, Jeff Liebermann wrote:
On Tue, 3 Dec 2013 23:37:43 -0500, "Ralph Mowery" wrote: A newer TV gets the analog and digital chanels off the cable. Then I have one of the boxes hooked to the main TV.. If my wife could operate things, I would go to something like Netflix. For Netflix, there are a variety of options. Computer, game box, media player, tablet computers, and built into the TV. For your wife, I suggest you try one of the Roku media players: http://www.roku.com/products/compare I have an older Roku 2 XS box and use it for Netflix. The remote control has only a few buttons, so it's fairly easy to learn. The difficult part is searching for shows to watch. I like to do that on a computah, where I can type in the name of the program on a real keyboard. You can plug in a keyboard into the Roku box, but that might add too much complexity. When I find something worth watching, I add it to my "favorites" list, which appears at the top of the screen when selecting shows on Netflix. What's really nice about Netflix is the total lack of commercials. Last week, one of my customers bought an Xbox One gizmo at Costco. Nifty system which can be voice controlled. All he has to do is say "Xbox show Netflix" and it's up. However, within Netflix, he has to use the included remote control. With the cable box, he can go directly to his favorite channel. "Xbox show TCM" will bring up Turner Classic Movies. If your wife can handle voice commands, it might be an (expensive) option. Marginally related RF drivel: One of my friends is avid DX'er. He has all his media and computer gizmos interconnected via Wi-Fi because Wi-Fi creates less RFI than ethernet. Then, he asks me to figure out why his wi-fi is so slow. None of the computers caused problems, but running Netflix in full 1080p was what was killing his wireless. My solution was to sell him a dual band wireless router, and reserve the 5GHz band for video. Then he has a problem in his ethernet. Properly installed, ethernet creates virtually no interference. -- ================== Remove the "x" from my email address Jerry, AI0K ================== |
#9
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Turning a 1/4 wave vertical upside down
On Sun, 15 Dec 2013 23:43:26 -0800 in rec.radio.amateur.antenna,
Jeff Liebermann wrote, Marginally related RF drivel: One of my friends is avid DX'er. He has all his media and computer gizmos interconnected via Wi-Fi because Wi-Fi creates less RFI than ethernet. Woah, how can that be? Would using shielded cat6 fix it? |
#10
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Turning a 1/4 wave vertical upside down
On 12/2/2013 12:39 AM, Jeff Liebermann wrote:
Comcast is now all digital in the People's Republic of Santa Cruz CA. I got my cable bill a few days ago, noted it had increased $10.00. Told the wife, she said ya, after Nov. the reduction I got last Nov. expired. She went in, made her yearly complaint, but this time she got a $20.00 discount! The bill dropped from $123.54 to $103.xx. (Cable, phone and internet) $240 a year, I think I'll taker her out for an ice cream cone. :-) Mikek |
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