IMO, it's reasonable to specify the overall "system"
SWR. And since the cable, after all, cannot be zero
length, they have to pick something. A length of 100
feet seems completely realistic.
Many folks have no idea that SWR as seen at the TX
goes down as your cable losses (length) goes up. Many
more believe that SWR is the holy grail of antenna
performance. Are they all being hoodwinked in this
case? I don't think so. (I'd vote "yes" if there were a 50-ohm resistor at the
antenna's feedpoint!)
Mike N2MG
On Thu, 04 October 2001, n4kg@juno.com wrote:
>
>
> So how much coax would you suggest they use
> to specify the SWR at the transmitter?
>
> Don't tell me ZERO. I don't know anyone who
> places their radio on top of their tower.
>
> Tom N4KG
>
> On Thu, 04 Oct 2001 08:53:57 -0400 Mel Martin <mel@interlink.net> writes:
> >
> > I don't... they deserve to be thoroughly scolded for this kind
> > "slight
> > of hand" specification. Stick to the truth... we can handle it!!!
> >
> > >I think F12 is being treated a little unfairly on this issue
> >
> > >"My hunch is that when F12 first developed the C-3, the 15M SWR
> > bandwidth
> > was a little tight to enable them to stay under 2:1 across this wide
> > band,
> > so they specced the antenna on 15 using 100 feet of coax to achieve
> > that
> > magic number, which they thought was important for marketing
> > purposes."
> >
> > List Sponsored by AN Wireless: AN Wireless handles Rohn tower
> > systems,
> > Trylon Titan towers, coax, hardline and more. Also check out our
> > self
> > supporting towers up to 100 feet for under $1500!!
> > http://www.anwireless.com
> >
> > -----
> > FAQ on WWW: http://www.contesting.com/FAQ/towertalk
> > Submissions: towertalk@contesting.com
> > Administrative requests: towertalk-REQUEST@contesting.com
> > Problems: owner-towertalk@contesting.com
> >
>
> ________________________________________________________________
> GET INTERNET ACCESS FROM JUNO!
> Juno offers FREE or PREMIUM Internet access for less!
> Join Juno today! For your FREE software, visit:
> http://dl.www.juno.com/get/web/.
>
> List Sponsored by AN Wireless: AN Wireless handles Rohn tower systems,
> Trylon Titan towers, coax, hardline and more. Also check out our self
> supporting towers up to 100 feet for under $1500!! http://www.anwireless.com
>
> -----
> FAQ on WWW: http://www.contesting.com/FAQ/towertalk
> Submissions: towertalk@contesting.com
> Administrative requests: towertalk-REQUEST@contesting.com
> Problems: owner-towertalk@contesting.com
________________________________________________
PeoplePC: It's for people. And it's just smart.
http://www.peoplepc.com
List Sponsored by AN Wireless: AN Wireless handles Rohn tower systems,
Trylon Titan towers, coax, hardline and more. Also check out our self
supporting towers up to 100 feet for under $1500!! http://www.anwireless.com
-----
FAQ on WWW: http://www.contesting.com/FAQ/towertalk
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
|