I got a JOGUNN son of a gunn for christmas anybody know anything about useing my new antenna on 11 meters??? I allways wanted one now everyone says its not for CB...What can I do??
Hey jgar, what happened about your antenna?
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Son of a Gunn
- Thread starter jgar
- Start date
Hey jgar, what happened about your antenna?
Thanks for all the help...no luck on the jo gunn... 419 dollars worth of trouble...{Cry_river} Any body got a maco 5/8 or a good equlevent and 100 dollars.give me a holler thanks again for all the help....
Jgar, their instructions are not very helpful, and the antenna is not known to be easy. It is possible you'll have trouble with the Maco as well, get an A99.
I'll give you a $100 for it, and you pay the shipping.**Jump_im**
Thanks 4 the offer grandpa but thats a little shy of what i need....I need a Imax Maco 5/8 any goood 5/8 11 meter and a c note...4 the joe gunn.... Anybody else?????.... thanks to every one who tried to help...but i anm hartbroke and ready 2 talk..ANYONE NEED A JOE GUNN?????
P.S. It dont have 2 be a new antenna.....Long as it is a 5/8 wave and Is rite....
Thanks JGAR{Cry_river}
P.S. It dont have 2 be a new antenna.....Long as it is a 5/8 wave and Is rite....
Thanks JGAR{Cry_river}
Try this:
Make the length of the vertical radiator 21 ft 6 inches long and the horizontal radials 104 inches long. Then test it with a SWR meter and set the gamma match bar until you get the SWR as low as you can get it on ch 20.
http://www.qsl.net/w4sat/five8th.htm
There is no such thing as a 'magical antenna'; they all must use the same physics to work!
Bet it works just fine. Because, that is the formula for a 5/8 wave vertical antenna. So, as you can see - it is a queestion of setting it up for the proper frequency thru adjusting the lengths is all . . .
**Jump_im**
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Robb, I would like to think that Jgar could take your advice and run, but I've told my story about two guys bad experiences with a JoGunn, and another buddy that got their problem to working just fine at their expense, like for $50, and he walked away grinnin'.
I offered Jgar double that, and I don't even need the antenna.
JG, probably could give instructions, that if followed, would nail one in the middle of CB, but they must be operating under some FCC supervision for past violations...or they would not be so strict in avoiding any reference to CB operations.
I built two new Sirio antennas, and both used a gamma, the New Top One for myself, and a New Vector 4000 for a buddy. I followed the instructions to the T, and they both worked the first time...with a good flat match across the CB band, so I know it can be done.
I can't prove it, but I think most guys that have trouble with tuning gamma matches are just chasing their tail, seeing the match first go one way, and then the other.
IMO, they're passing up the proper sweet spot...thinking they need to make 1/4" adjustments. IM other O, I think this common reference is used to adjust the gamma a 1/4" at a time, simply to find the direction needed to move. The general instructions should provide a starting point, and that point should be close, so an adjustment might need only be a 1/8",1/16", or maybe even a 1/32", one way or the another.
My experience when tuning close to Earth, and raising a gamma feed antenna is, if you're real close you likely won't see as much difference when you raise your antenna, but if the match is loaded with reactance, even if the SWR shows good, then raising will likely present you with an SWR problem.
I ain't preaching, just my old ideas to consider.
robb,
the son of a gunn is a 3/4wave groundplane, low impedance at the base, the gamma strap is tapped up the vertical to find 50ohms then the cap is adjusted to cancel the reactance,
a 5/8wave has relatively high end impedance, adjusting the gamma capacitor can only tune out reactance, it can't change the real part of the resistance.
the son of a gunn is a 3/4wave groundplane, low impedance at the base, the gamma strap is tapped up the vertical to find 50ohms then the cap is adjusted to cancel the reactance,
a 5/8wave has relatively high end impedance, adjusting the gamma capacitor can only tune out reactance, it can't change the real part of the resistance.
A gamma match has both capacitive and inductive reactance properties. When properly adjusted, a gamma match raises the impedance of an antenna to that of the feed line. It can and does mean that a resulting impedance's resistance and reactance can be adjusted resulting in 'R50 +/- J0'. Otherwise, why use a gamma match (or any other kind)?
- 'Doc
- 'Doc
I agree Bob, the gamma can't adjust the resistive part of the antenna like 'Doc may be suggesting, but the way I see it, the gamma can physically get close to the 50 ohm point on the radiator, and then we can adjust out the reactance using the gamma. Maybe 'Doc means the same thing, but I'm not sure.
Bob, where did you get the information that this antenna is a 3/4 wave?
doc,
you clearly have a reading dissability,
the real part is adjusted by relative tube diameters / spacing and arm length,
the cap can only adjust the imaginary part,
if the strap is not tapped close to the characteristic impedance of the line adjusting the cap won't fix it.
you clearly have a reading dissability,
the real part is adjusted by relative tube diameters / spacing and arm length,
the cap can only adjust the imaginary part,
if the strap is not tapped close to the characteristic impedance of the line adjusting the cap won't fix it.
Didn't realize that the SOAG was a 3/4 wave.
Thanks for the head's up, Bob.
Since that is the case, then the vertical length for a 3/4 wave length antenna will be 25 feet 9 1/2 inches (center freq is ch.20/27.205mHz for calculations - BTW). The radials should still be 104 inches. No magic to this; just a calculator and a formula . . .
Hey Robb, I haven't checked the numbers, but I take your word for it. I don't understand how that can be however, even though JoGunn says the antenna is 26' feet long. I don't know where this dimension is measured from and too, but I think this antenna, according to JoGunn, is a 10 meter antenna. So how does that jive?
Maybe Bob can tell us.
Bob85,
The only disability I seem to have is not agreeing with you, even when you aren't correct. I would endeavor to correct that problem but I can't! It requires effort on your part to not be wrong so much, and I have no control over that. But I will contribute what I can to this problem of yours by not pointing out your mistakes in the future.
- 'Doc
The only disability I seem to have is not agreeing with you, even when you aren't correct. I would endeavor to correct that problem but I can't! It requires effort on your part to not be wrong so much, and I have no control over that. But I will contribute what I can to this problem of yours by not pointing out your mistakes in the future.
- 'Doc
doc
your problem is not agreeing with or not understanding anything factual from respected sources,
point out with reference to a respected source what i said that's not true for the readers,
you not understanding what i said does not make me wrong,
virtually everything you post for your sheeple with regards antennas/transmission-lines is incorrect and cannot be backed up by any reference to respected sources ( you have been given the chance many times ) so it is unlikely we will ever agree on much pertaining to antennas / transmission-lines.
your problem is not agreeing with or not understanding anything factual from respected sources,
point out with reference to a respected source what i said that's not true for the readers,
you not understanding what i said does not make me wrong,
virtually everything you post for your sheeple with regards antennas/transmission-lines is incorrect and cannot be backed up by any reference to respected sources ( you have been given the chance many times ) so it is unlikely we will ever agree on much pertaining to antennas / transmission-lines.