[Antennas] 2 trees 150' apart 60' high

[Bob Wilder]

Perfect situation to run a double extended linear loaded zepp

                                                                  150 feet
-------------------------------------------------------------------------------------------------------------------------------------------/- 
/------------------------------------------------
                                          /      /
                                          /     /450 ohm
                                       to 4:1 Balun
                                         to tuner

short the ends of the top.   I used this configuration and worked over 250 
countries with 100 watts including 59+ constandly into NZ, AU and central 
Africa from south Alabama




At 05:48 PM 6/2/2005 -0400, A10382 wrote:

>Hi Jerry,
>
>And right you are.
>
>I've always cut a wire antenna about 2% longer and then trimmed it for
>best operation after it's up - usually on the center freq most important
>to me.
>
>I've generally found a 1/2 wl dipole, below 30MHZ, will have a rather
>narrow natural bandwidth of decent SWR.. maybe 150-350 KHZ.  In some
>bands, that's the entire band.  In some others, it only covers a small
>part of the entire band.  This makes the use of a tuner very beneficial
>if you're going to use a few parts of a relatively wide band - like 80,
>15, or 10M.
>
>There are wire antenna designs with larger bandwidths - like the folded
>dipole, bazooka designs, large diameter radiators, or multi-wire ones,
>but that bandwidth sometimes comes at the expense of some radiation
>efficiency.
>
>Antenna design is as much art as science.  One person's perfect antenna
>is the next person's air cooled dummy load.  With all the science, laws
>of physics, legend and lore (some of it inaccurate), and individual
>operator's experiences, talking about a subject like this can make for
>some verrrry lively discussions.
>
>Want the e-sparks to fly ?  Just ask a question about how to achieve the
>'best' SWR, or the preference of open feedline over coax feed.
>Lightening protection and grounding questions can also makes the e-rocks
>start a-tossin'.
>
>The archives of this list have some very good dissertations and on-line
>reference links from some very knowledgeable and experienced hams.  Not
>being an rf engineer, I defer to them that's smarter than me.
>====
>
>
>
>
>  ._._.
>
>
>----- Original Message -----
>From: "Jerry Forwood" <e.j.forwood at juno.com>
>To: <223bthp at cox.net>
>Cc: <Antennas at mailman.qth.net>
>Sent: Thursday, June 02, 2005 5:05 PM
>Subject: RE: [Antennas] 2 trees 150' apart 60' high
>
>
>
>The last time I looked the formula for a 1/2 wl dipole was 468/Feq in
>MHz.  468/3.75 = 124.8 ft.
>
>
>
>
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Bob & Carole Wilder
6032 Idlemoore Court
Theodore, AL 36582-4117
251-653-5274
http://home.bellsouth.net/p/PWP-af2hd [Not working]
Asst USAF State MARS Director- Alabama
Alabama State Training Director
AF2HD/AFA2HD
{Ex W2ZRX, K4FEU, KG1BW, F7CP, W1HJL, W4NVH and W4RHW}

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