Actually, the delta loop is fed at one of the lowers by many because of
convenience. When fed at that location, it is more of a oblique radiation
polarization pattern rather than the preferred vertical polarization. The
best way is 1/4 wavelength down from the apex and the characteristic
impedance at that point is ± 110 ohms, which is far from the 600 ohms
recommended by another contributor to this reflector.
IMHO and actual usage, for 75 I still like the four square head and
shoulders above even a pair of Delta loops with their apex's at 100 feet,
based on my experperience.
Bob W6TR
----- Original Message -----
From: "Bob" <rgshauger@myyellowstone.net>
To: "N7mal" <n7mal@citlink.net>; "Richards" <jruing@ameritech.net>;
<towertalk@contesting.com>
Sent: Wednesday, June 25, 2008 2:38 AM
Subject: Re: [TowerTalk] Delta Loop compared to Dipole (actual experience)
>A 80 meter full wave delta loop tilted at 45 degrees fed at the bottom
> corner works exceedingly well for early morning dx when compared to an
> inverted vee at the same height. Bob W7KD
>
>
> ----- Original Message -----
> From: "N7mal" <n7mal@citlink.net>
> To: "Richards" <jruing@ameritech.net>; <towertalk@contesting.com>
> Sent: Tuesday, June 24, 2008 9:26 PM
> Subject: Re: [TowerTalk] Delta Loop compared to Dipole (actual experience)
>
>
>> My lot is slightly smaller than yours is. I have a full sized 80 meter
>> loop,
>> 85 feet on a side. It is fed at the top with open wire 'real' 600 ohm
>> line
>> into the tuner in the shack. It is fed at the top so it is vertically
>> polarized. It is also open at the center of the bottom. It works very
>> well
>> on 160/80/40.
>> 73
>>
>>
>> MAL
>> N7MAL
>> BULLHEAD CITY, AZ
>> http://www.n7mal.com
>> Everyone in the world is
>> entitled to be burdened
>> by my opinion
>>
>>
>> ----- Original Message -----
>> From: Richards
>> To: w1rh@yahoo.com
>> Cc: towertalk@contesting.com
>> Sent: Wednesday, June 25, 2008 2:42
>> Subject: Re: [TowerTalk] Delta Loop compared to Dipole (actual
>> experience)
>>
>>
>> Do you think one could put a decent loop on a suburban lot
>> that is only 100 feet by 60 feet? How big a loop and how high
>> do you suppose it might have to be? I figure I could put something
>> up that is a total of, say, 250 feet around. I thought that might just
>> get me on 80 meters, and I could use a tuner for some higher bands.
>> Using a 40 foot metal mast, I might be able to get it up that high at
>> a reasonable effort and expense.
>>
>> Do-able? Worth doing if so?
>>
>> Whaddaya say? /// JHR - K8JHR ///
>>
>> ====================================================
>>
>>
>> Robert Hess wrote:
>>>
>>> I have had terrific luck with loops over dipoles.
>>
>> -----------------------------------------------------------------------------------------------
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>>
>>
>>
>> --------------------------------------------------------------------------------
>>
>>
>>
>> No virus found in this incoming message.
>> Checked by AVG.
>> Version: 8.0.100 / Virus Database: 270.4.1/1516 - Release Date: 6/24/2008
>> 7:53 AM
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>>
>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|