[TowerTalk] Cushcraft A4S Trap Orientation

[Rex Lint]

>Installing a 10m trap 'backwards' would actually raise the resonant  
>frequency as it would lengthen the portion of the antenna between the  
>10m traps.

Actually, it would lower the resonant frequency, no?

    -Rex-

     Rex Lint, Consultant
     26 Brek Drive
     Merrimack, NH 03054
     PH:    603-860-7651    

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of n8de at thepoint.net
Sent: Tuesday, November 16, 2010 6:27 PM
To: Richard Solomon
Cc: TowerTalk
Subject: Re: [TowerTalk] Cushcraft A4S Trap Orientation

The 10m portion of ANY trapped tri-bander is the aluminum between the traps.

If it resonates at 41mHz, then something is distinctly wrong as that  
would require less than the required 10m spacing.

Installing a 10m trap 'backwards' would actually raise the resonant  
frequency as it would lengthen the portion of the antenna between the  
10m traps.

Is there a balun?  Check it separately.  I'm betting it's bad.
Either that, or something else isn't measured correctly.

73
Don
N8DE


Quoting Richard Solomon <w1ksz at q.com>:

> A friend of mine was given an A4S that has a problem. The 10
> Meter portion resonates at 41 MHz (using MFJ Antenna Analyzer).
>
> He thinks one of the 10 Meter traps may be installed backwards.
> Since all markings are long gone, how does one determine the
> proper orientation, or does it not matter and perhaps one or
> more of the traps is bad ??
>
> Thanks, Dick, W1KSZ
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