[frgeek-michiana] Re: Cable coax antenna: do not use cable TV coax as a feedline
- From: "Dale Neddeau" <dpn@xxxxxxx>
- To: frgeek-michiana@xxxxxxxxxxxxx
- Date: Tue, 30 Oct 2007 18:35:50 -0500
> ----- Original Message -----
> From: mike@xxxxxxxxxxx
> To: frgeek-michiana@xxxxxxxxxxxxx
> Subject: [frgeek-michiana] Cable coax antenna: do not use cable TV coax as a
> feedline
> Date: Tue, 30 Oct 2007 10:41:43 -0400 (EDT)
>
>
>
>
> Warning, Danger Will Robinson!
>
> Using a cable TV coax as a feedline for WiFi applications is a bad idea.
> The radio expects a 50 ohm impedence and cable TV is 75 ohm. A good cable
> to use as a feedline is Times-Microwave LMR400. Now if you're using the
> center conductor of coax to build an antenna, it is cheaper and easier
> just to buy some wi-fi antennas. Take it from a guy who ran a wireless
> ISP, that's the way to go.
>
> Mike Neuliep
> Not using it as feedline, using it to make coaxial colliner antenna for omni
> directional gain. Didn't know you could buy an antenna for that purpose. Not
> wraped to tight anyway so I'll just try to make one. Sinse I already have the
> hardline anyway, thought I would try it. The loss due to the 25 ohm would not
> be as bad as not haveing the right velocity factor cause that would make the
> elements the wroung length and since I'll be useing many elements that could
> be a disaster.
Dale
> ---- Original Message -----
> >> From: "Mike Cook" <mikecook@xxxxxxxxxxxx>
> >> To: frgeek-michiana@xxxxxxxxxxxxx
> >> Subject: [frgeek-michiana] Re: Answer: Cable coax antenna
> >> Date: Tue, 30 Oct 2007 07:25:37 -0500 (GMT-05:00)
> >>
> >>
> >> The velocity factor should be 0.81 then.
> >> Mike
> >>
> > Thanks Mike, should be able to started this weekend, but probable no
> > sooner.
> > Dale
> >> -----Original Message-----
> >> > From: Dale Neddeau <dpn@xxxxxxx>
> >> > Sent: Oct 30, 2007 6:49 AM
> >> > To: frgeek-michiana@xxxxxxxxxxxxx
> >> > Subject: [frgeek-michiana] Re: Answer: Cable coax antenna
> >> >
> >> >
> >> >> ----- Original Message -----
> >> >> From: "Dale Neddeau" <dpn@xxxxxxx>
> >> >> To: frgeek-michiana@xxxxxxxxxxxxx
> >> >> Subject: [frgeek-michiana] Re: Answer: Cable coax antenna
> >> >> Date: Tue, 30 Oct 2007 06:31:51 -0500
> >> >>
> >> >>
> >> >>
> >> >> > ----- Original Message -----
> >> >> > From: "Richard Zimmerman" <ke4rit@xxxxxxxxxxxx>
> >> >> > To: frgeek-michiana@xxxxxxxxxxxxx
> >> >> > Subject: [frgeek-michiana] Answer: Cable coax antenna
> >> >> > Date: Mon, 29 Oct 2007 16:07:19 -0400
> >> >> >
> >> >> >
> >> >> > I got a reply back from y friend...
> >> >> >
> >> >> > Richard
> >> >> >
> >> >> > <reply below>
> >> >> >
> >> >> >
> >> >> > What size and type of cable?
> >> >> >
> >> >> > Anywhere from .87 to .71
> >> >> >
> >> >> > They can try www.comscope.com and see if anything is on there.
> >> >> > Either that or a Google on the actual brand/size should pull
> >> >> up > info.
> >> >> >
> >> >> >
> >> >> >
> >> >> > Jason
> >> >> >
> >> >> I was hoping for better than that, I had seen something that
> >> >> narrowed it down to .81 to .87. Well I guess I'll just try to
> >> >> make it using something within that range. Not at all sure it
> >> >> will work.
> >> >>
> >> >> Dale
> >> >> >
> >> > I measured the cable and it is half inch hardline with .111
> >> > copper clad aluminum center condutor. It has no jacket on it.
> >> >
> >> >
> >> > -------------- Original message ----------------------
> >> >> > From: Richard Zimmerman <ke4rit@xxxxxxxxxxxx>
> >> >> >
> >> >> > > > Hey,\
> >> >> > > > > Would you mind answering this for us....
> >> >> > > > > Thanks and much appreciated...
> >> >> > > > > Richard
> >> >> > > > > > -------- Original Message --------
> >> >> > > > Subject: [frgeek-michiana] coax cable antenna
> >> >> > > > Date: Sun, 28 Oct 2007 13:08:32 -0500
> >> >> > > > From: Dale Neddeau <dpn@xxxxxxx>
> >> >> > > > Reply-To: frgeek-michiana@xxxxxxxxxxxxx
> >> >> > > > To: frgeek-michiana@xxxxxxxxxxxxx
> >> >> > > > > > > Hey, is there anyone out there that would know
> >> >> what > the > velocity factor of > cable tv hardline coax would
> >> >> be. I > will try > to make a coax collinear antenna for > WiFi .
> >> >> but > without that I > could only make a guess and it would
> >> >> probably be > > wrong. Goose, > maybe one of your buddies over
> >> >> at comcast might > know. I didn't > > know about setting up a
> >> >> free WiFi station or > what ever you call > it untill Tom > said
> >> >> something about it last > thursday.
> >> >> > > > > Dale
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> >> >> >
> >> >>
> >> >>
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