RadioBanter - Antron99

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Late last summer we had a very close lightning hit,now my SWR's are
high.Any way i can run some sort of test to see if the Antrton is
shotred out?

On 8 May 2005 17:34:14 -0700, "farmerjoe1" wrote:

Late last summer we had a very close lightning hit,now my SWR's are
high.Any way i can run some sort of test to see if the Antrton is
shotred out?

Nuke it and get the Imax 2000 or Maco.

Vinnie S.

Vinnie S. wrote:
On 8 May 2005 17:34:14 -0700, "farmerjoe1"
wrote:

Late last summer we had a very close lightning hit,now my SWR's are
high.Any way i can run some sort of test to see if the Antrton is
shotred out?

Nuke it and get the Imax 2000 or Maco.

Vinnie S.

Nuke all of those and get what I use for a ground plane.

http://www.a1antennas.com/

Heck, make a 2 element quad and you'll be way ahead of the game. Even
make your own ground plane, yagi. Cheap and much better gain. At
least 11dB or bettter than the A99

Antrons are junk, get a coathanger.

Cliff wrote:

Heck, make a 2 element quad and you'll be way ahead of the game. Even
make your own ground plane, yagi. Cheap and much better gain. At
least 11dB or bettter than the A99

That's dbi, right? Can we get a real life gain figure?
You can't build an isotropic antenna.

When compared to a stated db in a ground plane you should get at least
10db better with a 2 element quard. Go to:
http://www.signalengineering.com/ultimate/

and it will tell you all about it. Have made a 2 element quad on
3/8wave and have talked to Nova Scotia, Hawaii, Australia, New Zealand
on a SBE Console II 23 ch am/usb/lsb radio with a std ceramic mic. My
design came from a ham operator in No.Ctrl Tx that runs over 2Kw on it
and goes wherever he wants, and almost makes his own skip.

But this is the way to go.

my cb friend made me an 2 element quad few years ago only 20 ft high
talking all over the place plus across the pond with an barefoot radio
73s

3/8 wave ant tell me more about it please that sounds better a mini quad
..

Will get to you on the measurements. Going to find out whether a 3/8 3
element quad will out perform a 1/2 2 element.

Why don't they put a price tag out there on them thar thangs!

Have you figured out how you are going to make your spreader bars, what
are you going to use for the boom, are you going to go horizontal or
vertical with it, or a combination of same, how high is your tower,
mast pole, are you mechanically challenged or are you one who can
challenge mechanics, what rotor will you use on it?

That be about all the questions for you at this time.

Steveo wrote:
Vinnie S. wrote:
On 8 May 2005 17:34:14 -0700, "farmerjoe1"
wrote:

Late last summer we had a very close lightning hit,now my SWR's are
high.Any way i can run some sort of test to see if the Antrton is
shotred out?

Nuke it and get the Imax 2000 or Maco.

Vinnie S.

Nuke all of those and get what I use for a ground plane.

http://www.a1antennas.com/

Like this?

http://www.a1antennas.com/order.html

On 9 May 2005 17:47:14 -0700, "Cliff" wrote:

When compared to a stated db in a ground plane you should get at least
10db better with a 2 element quard. Go to:
http://www.signalengineering.com/ultimate/
*****

I perused this page and for most of the info is adequate explaination.
I think he really lacks good explanation is some areas.

james

Just wondering where there is the 'lacking of good explanation' areas?
Shoot, I thought it was a fairly well done site! Much better than most
of us can truly understand. I wished that when I built the first
antenna I had had acess to that site. Would have kept a lot of 'trial
and error' work from going on.

james wrote:
On 9 May 2005 17:47:14 -0700, "Cliff" wrote:

When compared to a stated db in a ground plane you should get at
least
10db better with a 2 element quard. Go to:
http://www.signalengineering.com/ultimate/
*****

I perused this page and for most of the info is adequate
explaination.
I think he really lacks good explanation is some areas.

james

On 18 May 2005 00:52:28 -0700, "Cliff" wrote:

Just wondering where there is the 'lacking of good explanation' areas?
Shoot, I thought it was a fairly well done site! Much better than most
of us can truly understand. I wished that when I built the first
antenna I had had acess to that site. Would have kept a lot of 'trial
and error' work from going on.

*****
Overall it is a very good site. It is by far better than many that I
have seen in the past. But when some try to explain transmission line
issues with a small working knowldge of them, the all to often too
simple explanations or are lacking or misleading.

In the explanation of why coax affects SWR. While it is not bad, it is
typically and over symplistic. The real problem is that comon mode
currents are often not understood as to how they are generated and
what effects they have on SWR meters. Another thing is that the SWR
bridges made for CB and many for Ham use are poor instruments to
measure SWR. They are only good to about 3:1 and after that their
accuracy suffers greatly. The best way to measure the SWR of the
antenna is with a dual directional coupler. Preferably the power
measurements should be a spectrum analzer.

Also coax impeadance is determined by ratio of the inside diameter of
the outer conductor to the outside diamter of the inner conductor and
teh dielctric constant of the medium in between. Not just solely the
ratio of the diameter. That would be true only of air dielectric coax.

Coax loss is solely determined by the dielectric and not the shield.
As long as the shield is in relatively good shape the sole called
"leakage" loss is hardly measureable, even in relatively high power RF
transmissions. A shield of 80% is still nearly 100% effective even at
frequencies as low as 10 MHz. The openings in the shield would have to
be at least 1/16 of a wavelength in order to start to be able to
measure leakage. At 10M that is 1.25 meters.

What causes dielectrtic breakdown is chlorine in the PVC,
PolyvinalChloride, to leach into the dielectric and cause the
characteristic impeadance to change. Also chlorine from sea spray that
can leak into the coax from poorly assembled coax connectors. The site
is right in that cox does need to be changed. Even the best
installations require changing at least once every ten to fifteen yrs.

One thing also about antenna design and installations. Unless you
model the ground (Earth) for your area, you have missed a major
influience on the performance of any antenna design or installation.
There is a deal of hunt and peck to tame some designs. Especially
dipoles that are not at least a wavelength above ground. Some designs
behave better than others.

james

james wrote:
On 9 May 2005 17:47:14 -0700, "Cliff" wrote:

When compared to a stated db in a ground plane you should get at
least
10db better with a 2 element quard. Go to:
http://www.signalengineering.com/ultimate/
*****

I perused this page and for most of the info is adequate
explaination.
I think he really lacks good explanation is some areas.

james