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TV Aerial Experiment
Lets be silly. Take a commercial yagi TV aerial, take a strip of
cardboard, and make a full size copy of the layout using bits of 2.5mm T&E cable for the elements, and the cardboard to replace the spine. How well would it work? NT |
TV Aerial Experiment
wrote in message ... Lets be silly. Take a commercial yagi TV aerial, take a strip of cardboard, and make a full size copy of the layout using bits of 2.5mm T&E cable for the elements, and the cardboard to replace the spine. How well would it work? See http://www.wrightsaerials.tv/homemade2.htm http://www.wrightsaerials.tv/homemade3.htm Bill |
TV Aerial Experiment
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TV Aerial Experiment
"Bill Wright" wrote in message ... wrote in message ... Lets be silly. Take a commercial yagi TV aerial, take a strip of cardboard, and make a full size copy of the layout using bits of 2.5mm T&E cable for the elements, and the cardboard to replace the spine. How well would it work? See http://www.wrightsaerials.tv/homemade2.htm http://www.wrightsaerials.tv/homemade3.htm Bill Pleased that you are on this newsgroup. I enjoyed the aerial photos. |
TV Aerial Experiment
"John" wrote in message ... "Bill Wright" wrote in message ... wrote in message ... Lets be silly. Take a commercial yagi TV aerial, take a strip of cardboard, and make a full size copy of the layout using bits of 2.5mm T&E cable for the elements, and the cardboard to replace the spine. How well would it work? See http://www.wrightsaerials.tv/homemade2.htm http://www.wrightsaerials.tv/homemade3.htm Bill Pleased that you are on this newsgroup. I enjoyed the aerial photos. Thank you. I've always been here. They haven't found a way to eradicate me. And I'm a cult you know. An absolute cult, that's what some of them on here call me. Bill |
TV Aerial Experiment
"Bill Wright" wrote in message ... wrote in message ... Lets be silly. Take a commercial yagi TV aerial, take a strip of cardboard, and make a full size copy of the layout using bits of 2.5mm T&E cable for the elements, and the cardboard to replace the spine. How well would it work? See http://www.wrightsaerials.tv/homemade2.htm http://www.wrightsaerials.tv/homemade3.htm Bill homemade 3 is a stairway to heaven.............. |
TV Aerial Experiment
"Bill Wright" wrote in message ... "John" wrote in message ... "Bill Wright" wrote in message ... wrote in message ... Lets be silly. Take a commercial yagi TV aerial, take a strip of cardboard, and make a full size copy of the layout using bits of 2.5mm T&E cable for the elements, and the cardboard to replace the spine. How well would it work? See http://www.wrightsaerials.tv/homemade2.htm http://www.wrightsaerials.tv/homemade3.htm Bill Pleased that you are on this newsgroup. I enjoyed the aerial photos. Thank you. I've always been here. They haven't found a way to eradicate me. And I'm a cult you know. An absolute cult, that's what some of them on here call me. Bill Bill, For the first time ever I have explored some of the more obscure links on your web site. I'm sad to say I found "Albert's Attic" especially interesting. I always knew I was a "latent" anorak. Now I know for sure. David |
TV Aerial Experiment
tony sayer wrote:
In article .com, scribeth thus Lets be silly. Take a commercial yagi TV aerial, take a strip of cardboard, and make a full size copy of the layout using bits of 2.5mm T&E cable for the elements, and the cardboard to replace the spine. How well would it work? NT It would work .. so would any bit of metal, question is by how much relative to what;!.. Tony's right: the good news about yagis is that they "want to work". Anything that is sufficiently yagi-like will tend to be directional and have some forward gain, at some frequency or another. Making them work *well*, and on the frequency that you want to use, is quite another story. The active elements don't have to be "connected" together. The diameter of the 2.5. Elements would have an effect on the bandwidth.. By removing the metal boom and element clamps, and also changing the diameters of the elements, you have changed two things that affect the resonant frequency of each element. This shifts the frequency response of the whole array. And as for the changes in the driven element, and how they might affect the transfer of signal into the downlead... you have no way to know. If you are aiming to copy an existing Yagi design, you must copy: * all the element lengths * all the element diameters * the element mounting method. That means: copy EXACTLY. If you change any of these details, you are actually building a new design. The following page isn't specifically about TV yagis, but it gives some idea of what's involved: http://www.ifwtech.co.uk/g3sek/diy-yagi Sorry, but this really isn't a subject that you can just wander into and immediately succeed. Unless you have such a strong TV signal that none of this matters, you'd be better off with a commercial yagi. -- Ian White |
TV Aerial Experiment
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TV Aerial Experiment
On Feb 8, 6:03 am, "tpow" wrote:
"Bill Wright" wrote in message See http://www.wrightsaerials.tv/homemade2.htm http://www.wrightsaerials.tv/homemade3.htm Bill homemade 3 is a stairway to heaven.............. It is ! As a lad I took Dad's decommissioned Band I/III aerial, chopped up its elements and converted it to a Group C/D UHF. I was astounded to discover that simply by pointing out of my ground level bedroom window, I could receive watchable pictures from Mendip (about 90 miles away). |
TV Aerial Experiment
Good till it rained.
I built many yagis in my youth, and as long as the main dimensions and connections were right, they all worked. However wood as a boom did tend to dampen the performance....)ouch) Brian -- Brian Gaff....Note, this account does not accept Bcc: email. graphics are great, but the blind can't hear them Email: __________________________________________________ __________________________________________________ __________ wrote in message ... Lets be silly. Take a commercial yagi TV aerial, take a strip of cardboard, and make a full size copy of the layout using bits of 2.5mm T&E cable for the elements, and the cardboard to replace the spine. How well would it work? NT |
TV Aerial Experiment
"John" wrote:
"Bill Wright" wrote in message See http://www.wrightsaerials.tv/homemade2.htm http://www.wrightsaerials.tv/homemade3.htm Pleased that you are on this newsgroup. I enjoyed the aerial photos. It's a crossposted thread doncha know. -- Dave Farrance |
TV Aerial Experiment
In message
, Mark Carver writes On Feb 8, 6:03 am, "tpow" wrote: "Bill Wright" wrote in message See http://www.wrightsaerials.tv/homemade2.htm http://www.wrightsaerials.tv/homemade3.htm Bill homemade 3 is a stairway to heaven.............. It is ! As a lad I took Dad's decommissioned Band I/III aerial, chopped up its elements and converted it to a Group C/D UHF. I was astounded to discover that simply by pointing out of my ground level bedroom window, I could receive watchable pictures from Mendip (about 90 miles away). In 1967(ish), my parents old 3-element Channel 5 (Band 1) aerial got trimmed down for the amateur 4m band (~70MHz). I the furthest contact I made with it was Gibraltar. -- Ian |
TV Aerial Experiment
On Feb 7, 11:20*pm, "John" wrote:
"Bill Wright" wrote in message ... wrote in message ... Lets be silly. Take a commercial yagi TV aerial, take a strip of cardboard, and make a full size copy of the layout using bits of 2.5mm T&E cable for the elements, and the cardboard to replace the spine. How well would it work? See http://www.wrightsaerials.tv/homemade2.htm http://www.wrightsaerials.tv/homemade3.htm Bill Pleased that you are on this newsgroup. Which group? MBQ |
TV Aerial Experiment
"Mark Carver" wrote in message ... On Feb 8, 6:03 am, "tpow" wrote: "Bill Wright" wrote in message See http://www.wrightsaerials.tv/homemade2.htm http://www.wrightsaerials.tv/homemade3.htm Bill homemade 3 is a stairway to heaven.............. It is ! As a lad I took Dad's decommissioned Band I/III aerial, chopped up its elements and converted it to a Group C/D UHF. I was astounded to discover that simply by pointing out of my ground level bedroom window, I could receive watchable pictures from Mendip (about 90 miles away). You should try the one in my loft.. I need 24db of attenuation to avoid overloading the Philips set's receiver. Mind you I am only about 6 miles from Sutton and you get a decent digital picture using a screwdriver as an aerial. |
TV Aerial Experiment
"dennis@home" wrote in message ... "Mark Carver" wrote in message ... On Feb 8, 6:03 am, "tpow" wrote: "Bill Wright" wrote in message See http://www.wrightsaerials.tv/homemade2.htm http://www.wrightsaerials.tv/homemade3.htm Bill homemade 3 is a stairway to heaven.............. It is ! As a lad I took Dad's decommissioned Band I/III aerial, chopped up its elements and converted it to a Group C/D UHF. I was astounded to discover that simply by pointing out of my ground level bedroom window, I could receive watchable pictures from Mendip (about 90 miles away). You should try the one in my loft.. I need 24db of attenuation to avoid overloading the Philips set's receiver. Mind you I am only about 6 miles from Sutton and you get a decent digital picture using a screwdriver as an aerial. I bet that's because it's a Philips screwdriver...........;-) Chas |
TV Aerial Experiment
On Thu, 07 Feb 2008 18:17:51 +0000, Bill Wright wrote:
wrote in message ... Lets be silly. Take a commercial yagi TV aerial, take a strip of cardboard, and make a full size copy of the layout using bits of 2.5mm T&E cable for the elements, and the cardboard to replace the spine. How well would it work? See http://www.wrightsaerials.tv/homemade2.htm http://www.wrightsaerials.tv/homemade3.htm Brilliant site Bill! Hmmm... I guess I must qualify for an anorak myself. gets coat... -- Mick (Working in a M$-free zone!) Web: http://www.nascom.info http://mixpix.batcave.net |
TV Aerial Experiment
"Vortex3" wrote in message ... Bill, For the first time ever I have explored some of the more obscure links on your web site. I'm sad to say I found "Albert's Attic" especially interesting. Thank you. Bill |
TV Aerial Experiment
On Thu, 7 Feb 2008 18:17:51 -0000, "Bill Wright"
wrote: wrote in message ... Lets be silly. Take a commercial yagi TV aerial, take a strip of cardboard, and make a full size copy of the layout using bits of 2.5mm T&E cable for the elements, and the cardboard to replace the spine. How well would it work? See http://www.wrightsaerials.tv/homemade2.htm http://www.wrightsaerials.tv/homemade3.htm Bill I remember making a horizontal yagi to receive RTÉ in Liverpool on channel 7 back in the sixties. I'm sure I got the dimensions from Practical Television. It only worked in the summer the opening season. That's tropo not pub opening. |
TV Aerial Experiment
"mick" wrote in message . .. Brilliant site Bill! Thank you. Anyone who has pictures of particularly interesting/wierd/inexplicable/dodgy aerials please send them in. Bill |
TV Aerial Experiment
"XxXxXX" wrote in message ... I'm sure I got the dimensions from Practical Television. It only worked in the summer the opening season. That's tropo not pub opening. I see from your signature that you have an interest in quality ales. Bill |
TV Aerial Experiment
Brian Gaff wrote:
Good till it rained. I built many yagis in my youth, and as long as the main dimensions and connections were right, they all worked. However wood as a boom did tend to dampen the performance....)ouch) Brian Thanks everyone! Now I know. NT |
TV Aerial Experiment
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TV Aerial Experiment
In message , kim
writes wrote: Brian Gaff wrote: Good till it rained. I built many yagis in my youth, and as long as the main dimensions and connections were right, they all worked. However wood as a boom did tend to dampen the performance....)ouch) Brian Thanks everyone! Now I know. Something no-one mentioned here was the lack of a balun which could wreak havoc with weak digital signals due to standing waves on the cable. The most popular home-made types these days seem to be the bow-tie + reflector + balun design. (kim) Does the lack of a balun actually cause standing waves on the cable? -- Ian |
TV Aerial Experiment
Ian Jackson wrote:
In message , kim writes wrote: Brian Gaff wrote: Good till it rained. I built many yagis in my youth, and as long as the main dimensions and connections were right, they all worked. However wood as a boom did tend to dampen the performance....)ouch) Brian Thanks everyone! Now I know. Something no-one mentioned here was the lack of a balun which could wreak havoc with weak digital signals due to standing waves on the cable. The most popular home-made types these days seem to be the bow-tie + reflector + balun design. (kim) Does the lack of a balun actually cause standing waves on the cable? No but it helps eliminate them :o) (kim) |
TV Aerial Experiment
kim wrote:
Ian Jackson wrote: In message , kim writes wrote: Brian Gaff wrote: Good till it rained. I built many yagis in my youth, and as long as the main dimensions and connections were right, they all worked. However wood as a boom did tend to dampen the performance....)ouch) Brian Thanks everyone! Now I know. Something no-one mentioned here was the lack of a balun which could wreak havoc with weak digital signals due to standing waves on the cable. The most popular home-made types these days seem to be the bow-tie + reflector + balun design. (kim) Does the lack of a balun actually cause standing waves on the cable? No but it helps eliminate them :o) (kim) Is there a way to make a balun that wouldnt cost more than 10p? NT |
TV Aerial Experiment
wrote:
kim wrote: Ian Jackson wrote: In message , kim writes wrote: Brian Gaff wrote: Good till it rained. I built many yagis in my youth, and as long as the main dimensions and connections were right, they all worked. However wood as a boom did tend to dampen the performance....)ouch) Brian Thanks everyone! Now I know. Something no-one mentioned here was the lack of a balun which could wreak havoc with weak digital signals due to standing waves on the cable. The most popular home-made types these days seem to be the bow-tie + reflector + balun design. (kim) Does the lack of a balun actually cause standing waves on the cable? No but it helps eliminate them :o) (kim) Is there a way to make a balun that wouldnt cost more than 10p? Yes. I think the ones sold by Maplin cost less than 10p each to make :o) (kim) |
TV Aerial Experiment
In article ,
kim wrote: Yes. I think the ones sold by Maplin cost less than 10p each to make :o) I'm sure there was a Wireless World article called "a balun for 10p" - some 40 years ago, I suspect. -- From KT24 - in "Leafy Surrey" Using a RISC OS computer running v5.11 |
TV Aerial Experiment
On Mon, 11 Feb 2008 14:03:47 +0000 (GMT), charles
wrote: I'm sure there was a Wireless World article called "a balun for 10p" - some 40 years ago, I suspect. In that case wouldn't it have been "for 2/-"? ;-) -- Frank Erskine |
TV Aerial Experiment
In article ,
Frank Erskine wrote: On Mon, 11 Feb 2008 14:03:47 +0000 (GMT), charles wrote: I'm sure there was a Wireless World article called "a balun for 10p" - some 40 years ago, I suspect. In that case wouldn't it have been "for 2/-"? ;-) make it 36 years ago. -- From KT24 - in "Leafy Surrey" Using a RISC OS computer running v5.11 |
TV Aerial Experiment
"Man at B&Q" wrote in message ... On Feb 7, 11:20 pm, "John" wrote: "Bill Wright" wrote in message ... wrote in message ... Lets be silly. Take a commercial yagi TV aerial, take a strip of cardboard, and make a full size copy of the layout using bits of 2.5mm T&E cable for the elements, and the cardboard to replace the spine. How well would it work? See http://www.wrightsaerials.tv/homemade2.htm http://www.wrightsaerials.tv/homemade3.htm Bill Pleased that you are on this newsgroup. Which group? This one of course! MBQ |
TV Aerial Experiment
"Bill Wright" wrote in message ... "John" wrote in message ... "Bill Wright" wrote in message ... wrote in message ... Lets be silly. Take a commercial yagi TV aerial, take a strip of cardboard, and make a full size copy of the layout using bits of 2.5mm T&E cable for the elements, and the cardboard to replace the spine. How well would it work? See http://www.wrightsaerials.tv/homemade2.htm http://www.wrightsaerials.tv/homemade3.htm Bill Pleased that you are on this newsgroup. I enjoyed the aerial photos. Thank you. I've always been here. They haven't found a way to eradicate me. And I'm a cult you know. An absolute cult, that's what some of them on here call me. Oh dear, my brain, such as it is, substituted the 'l' for an 'n'! |
TV Aerial Experiment
alan holmes wrote:
"Man at B&Q" wrote in message ... On Feb 7, 11:20 pm, "John" wrote: "Bill Wright" wrote in message ... wrote in message ... Lets be silly. Take a commercial yagi TV aerial, take a strip of cardboard, and make a full size copy of the layout using bits of 2.5mm T&E cable for the elements, and the cardboard to replace the spine. How well would it work? See http://www.wrightsaerials.tv/homemade2.htm http://www.wrightsaerials.tv/homemade3.htm Bill Pleased that you are on this newsgroup. Which group? This one of course! MBQ Which one? This thread is crossposted. |
TV Aerial Experiment
wrote:
Lets be silly. Take a commercial yagi TV aerial, take a strip of cardboard, and make a full size copy of the layout using bits of 2.5mm T&E cable for the elements, and the cardboard to replace the spine. How well would it work? NT Well I finally got a few minutes to spare and made one. Didnt have time to measure an existing one, so just vaguely guessed. It works, albeit rather badly. Picture is quite a lot better than it was with no gain though, so there must be a handful of dB there. Unfortunately me camera's broke though. NT |
TV Aerial Experiment
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