Towertalk
[Top] [All Lists]

[TowerTalk] Force12

To: <towertalk@contesting.com>
Subject: [TowerTalk] Force12
From: nielsen@oz.net (Bob Nielsen)
Date: Wed, 3 Oct 2001 08:35:25 -0700
On Wed, Oct 03, 2001 at 08:00:59AM -0400, Pete Smith wrote:
> 
> 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.
> 
> And what does this magic number mean?  Almost nothing.  Without a tuner,
> some radios begin to fold back at SWRs well under 2:1.  Some amplifiers
> don't like a load much over 1.5:1.  Some radios, like my TS-930, soldier
> happily along into a 2.5:1 load.  Some amplifiers will drive loads up to
> 3:1, depending on the band (like my SB-220).  The practical advice is
> "don't worry about it."  Use enough feedline to get from the antenna on the
> tower to your rig, no more and no less (hi).
> 

Stated somewhat differently, use as much tower as the length of the
feedline will allow.

-- 
Bob Nielsen, N7XY                          nielsen@oz.net
Bainbridge Island, WA                      http://www.oz.net/~nielsen
IOTA NA-065, USI WA-028S 

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


<Prev in Thread] Current Thread [Next in Thread>