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Antron 99 question

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Badge19
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Antron 99 question

Post by Badge19 » Sunday, 20 August 2017, 7:01 AM

Good Morning,
I am currently using an Antron-99 which is mounted to the chimney and is about 40 feet in the air; I've seen that there is a ground plane kit for this antenna; any advantage to adding this..??

Thanks :biggrin:


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Re: Antron 99 question

Post by narfedwards1 » Sunday, 20 August 2017, 9:24 AM

If it works for ya now no TVI I'd just leave it...so little difference withs rads man...save yer$$$...for a beam dude
....enjoy

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Re: Antron 99 question

Post by MDYoungblood » Sunday, 20 August 2017, 10:35 AM

I always thought the ground plane kits for both the Antron A-99 and the Imax 2000 were afterthoughts, if they were effective on the antennas they would be sold with them, not as a kit. Looking at the kits the radials aren't physically long enough (electrically shortened) to create an umbrella effect under the antenna.

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Re: Antron 99 question

Post by LION EYES » Sunday, 20 August 2017, 12:54 PM

I have an imax on a piece of 12" channel off the porch rail no GP kit been working great. When I rarely try to run more than 100w through it I would here myself on my computer speakers. ordered a GP kit thought it might help and wanted to try it . Heard a tap on the screen door took me about 4 seconds to get to the door. Fed Ex was already pulling away There was my kit leaning against the jam with about a 15 deg L all 4 radials completely broke in half. Wasn't meant to be haven't reordered Ya gotta laugh to keep your sanity A I did some reading on GP kits for the 99 and Imax the higher percent of people that experimented say it doesn't make any improvement. but are great antennas without them

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Re: Antron 99 question

Post by MDYoungblood » Sunday, 20 August 2017, 13:57 PM

LION EYES wrote:
Sunday, 20 August 2017, 12:54 PM
I have an imax on a piece of 12" channel off the porch rail no GP kit been working great. When I rarely try to run more than 100w through it I would here myself on my computer speakers. ordered a GP kit thought it might help and wanted to try it . Heard a tap on the screen door took me about 4 seconds to get to the door. Fed Ex was already pulling away There was my kit leaning against the jam with about a 15 deg L all 4 radials completely broke in half. Wasn't meant to be haven't reordered Ya gotta laugh to keep your sanity A I did some reading on GP kits for the 99 and Imax the higher percent of people that experimented say it doesn't make any improvement. but are great antennas without them
Don't ya just hate that, Fed Ex would have got a ear full that day.

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Re: Antron 99 question

Post by LION EYES » Monday, 21 August 2017, 16:21 PM

Maybe we could start a thread on shipping horror stories. I've got a few I could laugh at someone else's misfortune instead of my own LoL

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Re: Antron 99 question

Post by MDYoungblood » Monday, 21 August 2017, 16:38 PM

LION EYES wrote:
Monday, 21 August 2017, 16:21 PM
Maybe we could start a thread on shipping horror stories. I've got a few I could laugh at someone else's misfortune instead of my own LoL
Granted we all have stories about shipping mishaps but "no bashing" is one of the rules of the forum, sorry, I would have a few funny ones myself.

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Re: Antron 99 question

Post by Firebreather » Tuesday, 22 August 2017, 10:44 AM

I ran one years ago with and without the radials. There was no difference. Don't waste your money.

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Re: Vacation mobile shack

Post by Blue Ox2 » Wednesday, 23 August 2017, 7:12 AM

Well, with all the equipment I have been gathering lately,
I have figured I will take the McKinley, the Tram 1499, a coil of
coax, and the power supply with an extention cord
and set-up my station on the deck at my condo
in the Poconos.
This will be at the end of October and I'll
hope to be making some good contacts from the mountains.
I'll take a mobile log book along too.

73

Mike

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Re: Antron 99 question

Post by Tweetybird » Thursday, 24 August 2017, 11:58 AM

Firebreather wrote:
Tuesday, 22 August 2017, 10:44 AM
I ran one years ago with and without the radials. There was no difference. Don't waste your money.
I did not use a GPK with a A99 but with an Imax and I can tell you the GPK got rid of my Electric noise.

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Re: Antron 99 question

Post by MDYoungblood » Thursday, 24 August 2017, 15:50 PM

Tweetybird wrote:
Thursday, 24 August 2017, 11:58 AM
Firebreather wrote:
Tuesday, 22 August 2017, 10:44 AM
I ran one years ago with and without the radials. There was no difference. Don't waste your money.
I did not use a GPK with a A99 but with an Imax and I can tell you the GPK got rid of my Electric noise.
I have heard a couple claims the ground plane kit helped reduce some noise but when questioning the poster they did other things as well like additional grounding etc., so it is hard to say it helped, was there anything else done at he same time? One poster said he removed an insulating piece of PVC because he thought the antenna should be isolated from the mast, when he removed it, it was a world of difference on both RX and TX.

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Greg
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The Second Amendment


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Uniden Washington
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Maxon HCB-40WX
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Hustler 102" SS Whip and Hustler Ball Mount

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Re: Antron 99 question

Post by darklife » Saturday, 28 October 2017, 9:12 AM

The GP may change the radiation pattern slightly but otherwise it's not doing anything more than your coaxial cable is already doing.. making a return path for the end fed half wave dipole that is the A99. Given that this antenna is fed from the end and the transformer inside the base of it sets up to make an unbalanced feed point the only way for the actual antenna element to radiate is to have to push against something, whether that is a short length of your coax or a ground plane doesn't really matter to it. If you have it mounted to a metal pole or tower and the coax against that it will simply use the metal structure as a return point.
You know these types of antennas are working good when the metal structure it's tied to is lit with a bit of RF and it will effect radiation pattern but that's the price you pay for that bit of return path with a high voltage feed at the end of the antenna rather than a middle current feed of a normal dipole. There is no 1:1 balun coiling you can do with coax that will help this. Best case scenario you have a half wave dipole vertically in the air, worst case you have a dummy load.


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