[TenTec] Antenna names

Mon Sep 15 11:20:43 EDT 2014

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 at 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. 
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>Ron Fish, KX1W
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>Sent from my iPhone
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>> On Sep 14, 2014, at 23:58, "Bob McGraw - K4TAX" <RMcGraw at 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 at gmail.com>
>> To: "Discussion of Ten-Tec Equipment" <tentec at 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 at 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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