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Jo-Gunn: Son of a Gunn

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Old 10-23-2006, 06:29 PM
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Default Jo-Gunn: Son of a Gunn


I've just had the pleasure of cutting apart a Jo-Gunn Son of a Gunn antenna.

Let me tell you, this antenna is HEAVY at the base! It should come at no surprise when you see that they use THREE layers of tubing in the base of this antenna!

Its also amazing, their use of woodscrews to hold this bad boy together! I used a hack saw to get the base apart, which is when I found the screws. They actually break off the heads and then slip the pieces together, covering the screws.

Now you may ask, why cut this antenna up?! Well, the previous owner cut the top tubing of the base assembly for some unknow reason. I wanted to fix this piece of aluminum and sell it, but I couldn't get it apart! The more I dug into it, it became clear that the base would have to be destroyed to get it apart, which would allow me to replace the previously broken section.

I got the antenna for free so what the heck! Out came the saw! (I'm cutting up a Maco V58 also. I'm doing a write up on how to convert your V58 to a V5000 with almost over the counter parts!).

What is interesting about this antenna is its height! 26'. I know of only one other antenna close to that length; the Sigma IV. This antenna uses 4 ground radial sloping down at a 45 degree angle and a gamma match, much similar to the Sigma IV. BUT, whereas the Sigma IV is only a half wave antenna, THIS antenna may truly be a 3/4 wave! (That should stir up the flies in here...right Bob!) But but, there is a weird sleeve inside the base section that may make this a different antenna altogether.

Also, this antenna does not use a coax connector. Not a bad idea as the coax connector is usually the weak link in an antenna system.

I may rebuild it. The base assembly is VERY easy to build with standard aluminum square tubing and a hole saw! I wouldn't have used wood screws, but maybe Jo-Gunn was trying to keep the base assembly a secret. I don't know.

I don't have the manual for this antenna so I'm not sure what the original tubing lengths were. I'm going to try to get one from the factory.


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Old 10-23-2006, 08:42 PM
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I love to see some pictures.

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Old 10-24-2006, 08:49 AM
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lol chief, somebody put the son of a gun radials on upside down hahaha,
i will wager you one aircraft rivet that folding the radials upwards say to about 25/30 degrees from the vertical and retuning will increase the radiation in a favourable direction rather than stop the lower 1/4 radiating and forcing the radiator to act like a humble halfwave,

joking aside, you got my attention simply because the jogunn is unconventional,
get this thing fixed up and tuned correctly for max signal on the horizon and let us know how it compares to more conventional antennas,
i will eat my hat if that thing can = even the stock sigma4 at low angles to the horizon,
i look at it and see broken up lobes with lots of high angle ideal for short skips into europe,
nothing scientific of course just based on past experiments i have done with extended antennas,

ps why do you live 4500 miles away i have something longer and stiffer to show ya, you could not fail to be impressed :twisted:
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Old 10-24-2006, 02:09 PM
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I too would like to see some pictures

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Old 10-24-2006, 08:32 PM
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hey chief are you saying the groundplane on the jogunn is capacitively coupled to the radiator and folded down rather than been directly connected and folded upwards as in the avanti????,
is either the radiator or the groundplane electrically connected to the supporting mast?

interesting antenna :!:
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Old 10-24-2006, 11:38 PM
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interested in the write up on maco v5/8 to maco v5000.

I have one on the porch that is going to come down for an i10k in the next few months if I don't find someway to convert it.

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Old 10-25-2006, 12:11 AM
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Quote:
Originally Posted by bob85
hey chief are you saying the groundplane on the jogunn is capacitively coupled to the radiator and folded down rather than been directly connected and folded upwards as in the avanti???? is either the radiator or the groundplane electrically connected to the supporting mast? interesting antenna :!:
Its really a simple design. The groundplane elements are electrically connected to the base tube and go DOWN at a 45 degree angle. The main element is also electrically connected (grounded) to the base tube (just like the Sigma IV). The antenna is fed with a gamma match (also like the Sigma IV) and is 26' tall (just a bit shorter than the Sigma IV).

So, the only thing capacitively connected to the antenna is the coax center cnductor via the gamma match. The rest of the antenna is DC grounded.

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Old 10-25-2006, 12:13 AM
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Quote:
Originally Posted by distortion
interested in the write up on maco v5/8 to maco v5000.
Hello Josh! Watch for it in the next few weeks! I'll post pictures and a parts list as well as where to buy the parts. I may even sell kits with a new assembly manual written by me.

It still won't beat the I-10K, but it will kill an A-99!

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