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Re: [TenTec] Antenna names

To: Ronf404 <ronf404@aol.com>, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Antenna names
From: Paul Gates via TenTec <tentec@contesting.com>
Reply-to: Paul Gates <paulgates80@yahoo.com>, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Mon, 15 Sep 2014 08:20:43 -0700
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
How long of a ground do you have with the 119 ft antenna?


On Monday, September 15, 2014 12:22 AM, Ronf404 via TenTec 
<tentec@contesting.com> wrote:
 

>
>
>I had considered a G5RV but opted instead for a 119' long wire up about 65' 
>over a tall tree. Loads under 1.5:1 on all bands from 10-160 with a tuner; 
>many bands load at 1.1:1. 
>
>Ron Fish, KX1W
>
>Sent from my iPhone
>
>> On Sep 14, 2014, at 23:58, "Bob McGraw - K4TAX" <RMcGraw@Blomand.net> wrote:
>> 
>> The developer of the G5RV basically states that it is optimized for 20M, 
>> thus typically having a low SWR of 1.8:1 on that band.  Other bands the G5RV 
>> will have a higher SWR in the range of 5:1.   Thus on some frequencies the 
>> G5RV may be too reactive for the limited range of many internal tuners.
>> 
>> Interesting enough, the length of the G5RV is 51 ft on each side of center 
>> for a total of 102 ft. overall.  Then add the 31 ft of 450 ohm ladder line. 
>> Looking at the configuration we see it is basically two inverted L's 
>> oriented back to back with the long portion of the L being the flat top 51 
>> ft sections and the short part of the L being each side of the 30 ft of 
>> ladder line.  To sum it up, a dipole with reverse drooping ends for a total 
>> length of 133 ft.  Just the right length of most 80M antennas.  However with 
>> the feedline length of 31 ft, considering velocity factor,  it is 
>> approximately 1/2 wave on 20M.   Thus the flat top ends each become 3/4 
>> wavelength on 20M for 1.5 wavelengths overall.  The impedance at the center 
>> feedpoint is ~90 ohms, depending on height above ground. With a 1/2 
>> wavelength transmission line being fed from a 1:1 current balun this load is 
>> seen by the transmitter with the SWR on the coaxial segment being 
>> approximately 1.8:1.
>> 
>> While some claim that the G5RV is an all band antenna, we find in reality it 
>> is a non resonant dipole fed with a section of ladder line from a 1:1 
>> current balun.  Thus a wide range tuner is required to match this antenna on 
>> all HF bands where the antenna is approaching 1/2 wavelength or more.
>> 
>> You are correct, the configuration you have is certainly not a G5RV by any 
>> degree of imagination.
>> 
>> 73
>> Bob, K4TAX
>> 
>> 
>> 
>> 
>> ----- Original Message ----- From: "Wade Staggs" <tvman1954@gmail.com>
>> To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
>> Sent: Sunday, September 14, 2014 9:09 PM
>> Subject: Re: [TenTec] Antenna names
>> 
>> 
>>> *Running 126 feet of wire... 63 feet in each direction... Center fed with
>>> 450 ohm Window Line. It is most assuredly Not a G5RV. But my friends keep
>>> wanting to call it a G5RV. We can work 80 thru 6 meters with a good manual
>>> tuner. Is it the best antenna in the World? Of course not...... But at this
>>> Rental Property with some restrictions, we can talk and hear about the same
>>> as others using Fan Dipoles and Dedicated to the Single Band Dipoles.
>>> Everything in life is a compromise. Can I unbalance the antenna and offset
>>> the Window Line an inch from the dead center and call it a Windom? This
>>> would clear up everyone's insistence that my antenna is a G5RV..... Just
>>> Joking Folks....*
>>> 
>>> *
>>> 73 from Wade/KJ4WS*
>>> 
>>> On Sun, Sep 14, 2014 at 2:41 PM, Ken Brown <ken.d.brown@hawaiiantel.net>
>>> wrote:
>>> 
>>>> The Zepp was a one sided antenna, with a quarter wavelength openwire
>>>> feedline to a halfwave wire. ....
>>>> 
>>>> Hams are funny about naming antennas. For example, a Zepp antenna may have
>>>> been clearly defined as above, but then people make modifications that
>>>> diverge so much from the original meaning of the name it makes no sense to
>>>> keep using that name. Make it into a dipole, and call it a "Double Zepp."
>>>> There is no way a Double Zepp could ever be used the way a "real Zepp" was
>>>> used on a Zeppelin....
>>>> 
>>>> Or make the horizontal wire longer, and call it an "Extended Zepp." But
>>>> then it is not the length it needs to be a normal Zepp. So why keep calling
>>>> it a Zepp?
>>>> 
>>>> Then there is the G5RV antenna. The "inventor" G5RV said there is no such
>>>> thing. He built a dipole and experimented with various lengths of ladder
>>>> line and coax, to try to find a combination that worked good on multiple
>>>> bands. He said it was just a dipole, but the ham community called it a
>>>> G5RV. Now there are hams who claim that a specific length dipole, with
>>>> specific lengths of ladder line and coax feeding it are "genuine G5RV
>>>> antennas" and the anything else is not. Other hams think that any dipole
>>>> fed with ladder line is a G5RV.
>>>> 
>>>> DE N6KB
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>> 
>> 
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