I lost a couple of "stingers" on my Hy-Gain Hy-Tower Vertical, then I
put a piece of 1/8" poly rope inside it, epoxied it at top and bottom
(I did put some tension on the rope).
Never had another failure.
73 es HH, Dick, W1KSZ
On Wed, Dec 19, 2012 at 9:38 AM, <john@kk9a.com> wrote:
> It should not be that difficult to design a 44' stinger that will hold up
> to the elements. I had a homebrew 54' freestanding vertical that held up
> to Aruba's winds for a decade. The stinger needs to be tapered and start
> with a heave base as Gerald suggested.
>
> John KK9A / P40A
>
>
>
> To: w3ea@hotmail.com, towertalk@contesting.com
> Subject:Re: [TowerTalk] Hi Gain Hi-Towers
> From: TexasRF@aol.com
> Date: Wed, 19 Dec 2012 10:26:46 -0500 (EST)
>
> Wayne, have you done a stress analysis of the stinger? You should be
> able
> to use one of the yagi stress programs to do that.
>
> If you think about it, your 44ft stinger is similar to one half of an
> 88ft
> long yagi element. That is not a trivial size; quite a bit longer than a
>
> full sized 40m element for example.
>
> It is not unusual to see a full sized 40m element that is 2 to 2.5" OD
> at
> the center and 1/4" wall thickness.
>
> Since the stinger is much closer to the ground than a typical 40m beam,
>
> there will be somewhat less wind exposure. It seems logical that there
> would
> be no need for wind survival greater than 70 mph but it depends greatly
> on
> how exposed the stinger is to the wind. A few trees or buildings in the
>
> vicinity would help with wind exposure. Sitting at the top of a nice
> hill and
> in the clear, then full exposure should be expected.
>
> A possible solution is adding some guys to the stinger. Some 1200 pound
>
> rated Phillystran would serve well for that.
>
> Hope this helps resolve your problem.
>
> 73,
> Gerald K5GW
>
>
>>
>> ----------------------------------------
>> From: "Wayne Kline" <w3ea@hotmail.com>
>> Sent: Sunday, December 16, 2012 9:28 PM
>> To: "towertalk@contesting.com" <towertalk@contesting.com>
>> Subject: [TowerTalk] Hi Gain Hi Tower ??
>>
>> Hi fellow Tower Talkers.. . I built a 75/80 meter Four Sq, antenna
> system
>> many years ago. It was feed with an original DX eng. ( not the new Dx
>
> eng
>> co.) quadature. The Hi Gain Hi towers were stripped of everything
> and a
>> center stinger was built and the system was resonantat 3.625 MHZ
> and
>> the power dump at 3.500 was 70 watts and at 3.825 was 100 watts. I
> used
>> the two insulators at the two stinger vertical element with a 14ga
> wire
>> attached at it's bottom and travel down the inside of the 24ft base
> tower
>> attaching at the feed point. There are 108 evenly spaced 1/4 radials
> under
>> each antenna, with silver soldered connections at there interesting
> 8ga
>> copper X and 9- 8 ft 5/8" ground rods. One at each tower base, one
> at
>> the control box in the center of the array and 4 at the end of the
>> centered X wire.I had a few 80 meter ops who felt that because I
> insulated
>> the top 38' stinger at the top of the tower resulting in a Shorter
> over
>> hight antenna was a compromise. So I
>> got in touch with tim K3LR knowing he also had a 75/80 meter 4 SQ mad
>
> out
>> of Hi-Gain Hi Towers, He sent me a rough dimension of his stinger out
>
> the
>> top of his Hi-Tower. I un insulated the stinger and built my
> elements
>
>> and achieved resonance with an additional 9ft height.Well it seemed
> My
> WX
>> in eastern PA did not like the 48' stinger and I would loose one at
> almost
>> every Nor'easter Storm. SO I am thinking of going back to the
>> original configuration with insulated top 2" tuber and the 14 ga
> wire
> down
>> the center of the tower to the base. Thought's out there Just
> kicking
>> around ideas ? Wayne W3EA
>
>
> _______________________________________________
>
>
>
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