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Post by ridgerunnr on Sept 29, 2008 0:05:24 GMT
Hi everybody!! You see that lil spinning yagi picture in my avatar area? Well it is one of the images provided by this site for an avatar (you can see a better shot of it in "modify profile")' It also happens to be the precise actual yagi I was telling you I got at an estate sale a few months back. Problem is I cannot identify it because I dont know anything about it. Den-Zo-Renae-Martin?? Have you seen this 1 and can you tell me who built it and its application? I'm pretty sure it's VHF hi ham-73s
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Post by k9do on Sept 29, 2008 11:45:30 GMT
Hi everybody!! You see that lil spinning yagi picture in my avatar area? Well it is one of the images provided by this site for an avatar (you can see a better shot of it in "modify profile")' It also happens to be the precise actual yagi I was telling you I got at an estate sale a few months back. Problem is I cannot identify it because I dont know anything about it. Den-Zo-Renae-Martin?? Have you seen this 1 and can you tell me who built it and its application? I'm pretty sure it's VHF hi ham-73s I have no clue I found this avatar, I just searched "Yagi" and then made it spin in animation shop.
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Post by m0wow on Sept 29, 2008 13:16:51 GMT
Hi ridgerunnr, That is a really difficult question to answer without more information, as one yagi looks very much like another, but i will try to help. All yagis are built, the same with a reflecter element, a driven element, and director elements. The reflecter is the one nearest the mounting bracket and is the longest element, next is the important one the driven element. If you could measure the length of the driven element and post it, we should be able to work out it's resonant frequency and tell you what band it is for. Hope this helps.
73's de Den.
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Post by M0ZIF on Sept 29, 2008 19:02:22 GMT
do you know the db gain on it? one option would be to use Polar Plot to map the yagi and post the results, but often yagi's are home built, which alters the characteristics. Buit PolarPlot will also give you a figure on gain too. I find antennas that have a name usually are slightly less useful than ones built by amateurs as a project, due to the fact that an amateur always tweaks where as a manufacturer goes on x length of tube, +y length of this and that
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Post by ridgerunnr on Sept 30, 2008 0:59:41 GMT
WOW first things first: Renae, thanks to you for that clever avatar!! With your blessing, may I don it in good health!!! Den and Martin-I have to go back into my old posts because I think both of you already had me measure the elements? I will search and get back here. Thanks guys-73s all!
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Post by ridgerunnr on Sept 30, 2008 3:27:11 GMT
OK boom:51"-driven and directers:36"-and reflecter:41" and that driven element is a full flat oval just as in Renae's avatar find-totally identical. It also has this loop of cable between the lead-in and ground-like 3-turns worth?
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Post by m0wow on Sept 30, 2008 10:28:07 GMT
Hi Ridgerunnr, Going off those measurements i think you have a 1/2 wave beam for the 2mtr band (144-145Mhz), i would also hazard a guess that it has about 6db gain. hope this helps ya 73's de Den.
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Post by k9do on Sept 30, 2008 11:47:26 GMT
WOW first things first: Renae, thanks to you for that clever avatar!! With your blessing, may I don it in good health!!! I tried to find where I got the photo from but it was quite some time ago I couldn't find it. I thought maybe it would have more specifics. hope Den's reply helped.
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Post by ridgerunnr on Sept 30, 2008 17:27:17 GMT
Thanks Den for nailing it! Now I know what I have for sure for future use! Thanks again Renae for giving me that lucky shot of my beam! Martin-your radio expertise is awsome I can see-and appreciated here too-73s
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Post by m0wow on Oct 1, 2008 12:22:24 GMT
Happy to help 73's de Den.
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Post by M0ZIF on Oct 1, 2008 19:04:33 GMT
My pleasure
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