[Lowfer] flat top

Tue, 08 Apr 2003 01:42:18 -0400

Eric,

>I believe that for a flat top or other symmetrical Tee type of >antenna, 
>the length of the vertical section plus half the length of >the top section 
>should not exceed 15 meters.

Lyle's opinion expressed above represents about half of the Lowfers I have 
had contact with on this subject. The other Lowfers (including myself) 
believe that whatever one can fit within a 15 meter tall cylinder having a 
15 meter diameter is OK. This opinion is also stated in the ARRL Antenna 
Book. The loop guys with their 15 meter per side dimensions are believers of 
this interpretation as well.

Seems to me that either interpretation has served the 'Lowfer cause' 
extremely well because it has placed, in addition to the 1w limit, a limit 
on interference to other services ........... and more importantly: It has 
placed everyone on a reasonably level playing field (with some handicap to 
the upper interpretation). AND there is no question in my mind whether or 
not the TX Lowfer loop in the US would have evolved had the cylindrical 
definition not been an option.

Bill

>From: Eric Smith <[email protected]>
>Reply-To: [email protected]
>To: [email protected]
>Subject: Re: [Lowfer] flat top
>Date: Mon, 7 Apr 2003 10:28:43 -0500 (CDT)
>
>On Mon, 7 Apr 2003, Lyle Koehler wrote:
>
> > There are many strange and wonderful definitions of "length" in the 
>LowFER
> > community.
>
>
>Thanks, Lyle.  Sounds like you would follow the same standard I would if I
>built a flattop, which would be vertical length plus half the flat top
>length ... I see that as similar to using top hat RADIUS.
>
>I would like to try one in the future.
>
>Similarly I've wondered how the 200' loop is considered part 15?  But I'm
>a newbie and probably just don't understand.  It is that lack of
>understanding combined with the directional nature of loops that has kept
>me from trying one so far.
>
>Thanks,
>Eric, KD5UWL

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