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Möte AMATEUR_RADIO, 1039 texter
 lista första sista föregående nästa
Text 888, 55 rader
Skriven 2007-11-23 15:31:40 av Roy Witt (1:397/22)
    Kommentar till text 876 av mark lewis (1:3634/12.0)
Ärende: yagi cantenna building
==============================
17 Nov 07 11:59, mark lewis wrote to all:


See replies in the HAM echo...

 ml> [i've posted this in HAM but haven't gotten any real hits so i'm
 ml> trying to reach more folk who would have experience building antennas
 ml> who may be able to answer my question(s)... hopefully this isn't too
 ml> far off of amateur radio topicality...]

 ml> i'm trying to finish up a yagi cantenna for my wifi router that i
 ml> just got... this is for 2.4Ghz... i've followed instruction on the
 ml> internet at o'riley's web site for a compact cantenna (the yagi
 ml> reflector is inside the can instead of outside) and i've a couple of
 ml> quick questions... yeah, i've one or two clues about antennas but
 ml> this is the first of this type i've played with...

 ml> my main question is about the reflectors... the instructions say
 ml> 1inch diameter washer with 1.2inch "spacers" (i'm using copper
 ml> tubing)... however, i've only got 1.5inch washers handy and i need,
 ml> by the plans, 5 of them... this is a 1/4 wave antenna...

 ml> the question is, will the 1.5inch washers work or must i get some
 ml> 1inch ones?

 ml> the plans also called for 1/8th in all-thread but i happaned to have
 ml> a threaded rod that is/was 1/4inch at the threads... but i didn't
 ml> need those threads as they were too far from the head... to i
 ml> threaded the rest of the shaft and then cut it down to length... the
 ml> shaft, itself, it 3/16ths... will this make any real difference?

 ml> i'm not looking for anything hugely amazing or such... i just need to
 ml> get this signal some 30 meters or so across the yard and into a metal
 ml> tag-along RV trailer...

 ml> according to the o'riley article, though, this thing should be good
 ml> for something like 12db gain and with two of them (one on each end)
 ml> and line of sight, the math says that they should be good for over 10
 ml> miles (!)... glad i'm just trying to go 30 meters :lol:

 ml> i can post more details if needed but i just wanted to touch base
 ml> with those who would be more into making their own antennas and see
 ml> what they have to say ;)

 ml> )\/(ark

 ml>  * Origin:  (1:3634/12)

                R\%/itt


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