[WVDXA] Fwd: Topband: Addition To SteppIR For 160, 75/80, 60, 40 and 30.

Tue Jan 8 18:57:11 PST 2008

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>Date: Tue, 8 Jan 2008 16:05:40 -0800 (PST)
>From: George Badger <gbadger at sbcglobal.net>
>To: topband at contesting.com
>X-Mailman-Approved-At: Tue, 08 Jan 2008 19:47:33 -0500
>Subject: Topband: Addition To SteppIR For 160, 75/80, 60, 40 and 30.
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>Topbanders
>About a year ago I put up a new 3 el SteppIR. It is a sensational 
>antenna. I did not want to lose low band capability so I put a loop 
>over the top of the steppIR in  the plane of the boom. All matching 
>and connections for 30, 40, 60, 75/80 and 160 are made at ground 
>level so there is no tower climbing. On 160 TX the loop is driven on 
>one side against a loop radial system in my basement and the other 
>side is left open. The total length of the loop wire is somewhat 
>more tha 1/4 wl but it is bent over in the middle so the height is 
>only about 1/8 wl. The pattern is omni to 0.1 dB whereas an inverted 
>L at the same height loses about one dB
>in the pattern and the loop has only one support.
>I don't have room for a separate RX ant. so I tried the loop on 
>EZNEC connected like a K9AY. It didn't work so I tried adding 
>reactance in series with the loop.That worked. By adjusting 
>resistances and reactances at the load end and at the source end I 
>could get between 30 and 49 dB F/B with Minninec, high accuracy, 
>perfect and freespace grounds.
>The EZNEC results looked good but I still did not believe the 
>results so I tried it in the real hardware wold. It works! I 
>measured more than 30 dB F/B and the loop is big enough so a preamp 
>is not needed.It's nice to have a high performance RX beam that 
>rotates and is physically the same as the TX antenna.
>The whole system worked so well that I wrote an article for QST. It 
>will be in the Feb. issue coming out now. Take a look.
>
>73
>
>George    W6TC
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