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[TowerTalk] Half slopers using a tower

 To: [TowerTalk] Half slopers using a tower aa4lr@arrl.net (Bill Coleman) Wed, 2 Jan 2002 11:33:15 -0500
 ```On 1/1/02 6:48 PM, Stephanie WX3K at wx3k@ptd.net wrote: > >-----Original Message----- >From: Bill Coleman [mailto:aa4lr@arrl.net] >Sent: Tuesday, January 01, 2002 5:52 PM >To: Stephanie WX3K; Towertalk >Subject: Re: [TowerTalk] Half slopers using a tower > > >On 12/31/01 4:59 PM, Stephanie WX3K at wx3k@ptd.net wrote: > >>My tower is 65 feet with a Mosley Pro95 beam sitting just above the thrust >>bearing. The "Half-Sloper" is hung at a 45 degree down at the 50 foot >>level.....about 128 feet of wire...fed at the 50 foot level with 50 ohm >coax >>and the shield ground right there on the tower. > >Somehow the math doesn't work out. 45 degrees at 50 feet should require >about 90 feetof wire. For 128 feet, it must be shallower than 45 derees. > >>>>>Please share your calculations !!!!! I assume your tower is set in flat ground. Thus, the tower, the antenna wire, and the ground make a large triangle. Since the angles of a triangle must sum up to 180 degrees, we have a 90 degree angle at the tower, 45 from the tower to the sloper, which leaves 45 degrees from the sloper to the ground. Such a triangle must have equal sides, which are declared as 50 feet. The sloper, therefore, must be have a length of one side times root 2. This is roughly 1.4. 1.4 * 50 = 90 feet. (oops -- did the math wrong the first time) 1.4 * 50 = 70 feet. (Yup, that's right) >>Anyone ever try this ??? The >>match I have is still unacceptable...2.5 to 1.....Any suggestions ? > >What band? 40m? 80m? 160m? It seems too long for either 40m or 80m, and >too short for 160m. > >>>>>An earlier email mentioned 160 meters Ah, that may be a problem. You probably don't have enough tower to properly act as the other half of the sloper. I'd suggest an Inverted L instead. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand years will man ever fly!" -- Wilbur Wright, 1901 ________________________________________________________________________ This list is sponsored by the new eHam.net Store. When you buy products like ICE filters, Array Solutions StackMatch, or M-Squared Antennas from the eHam Store for the same price you pay direct, a portion of the sale price goes to support this list. Check it out at http://www.eham.net. ----- FAQ on WWW: http://www.contesting.com/FAQ/towertalk Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com ```
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