Thank You / Thank You / Thank YOU VERY MUCH!

I can make a loop out of some copper tube and I can use a old piece of RG 8 for the stub match and I have enough aluminum tube from another Ringo to make the mast 18' long.....

All I need to do now is take down what I have and modify it and put it back up.

THANK YOU!

Dummy ME! - I could have bought a used antenna analyzer at a hamfest today for $50.00 - MFJ that had no digital display and no UHF and NO POWER SUPPLY and no instructions.

I was told that I could have used it with a transceiver, turn the knob until it zero beats the frequency of the receiver and then use it to tune the antenna.

I probably messed up!

Then again - if it was $50.00 and didn't work and could not be repaired - it would have been $50.00 that could have been applied towards another antenna.

This is what happens when you try to help someone and when you try to give something away to a friend..
It always happens that something is not right and that when it does not work as intended - even if several years later - I end up being the bad guy.

In fact - the Ringo listens real well - it just doesn't transmit - because the impedance / reactance is wrong.

I could have bought a good antenna analyzer last year for $85.00 and did not because a friend of mine wanted it and bought it for $65.00

I'm learning that amateur radio is a lot like stock car racing.
The only friends you have is the ones you brought to the track with you!
Once the Green flag falls - all agreements are off and it is a free for all.

On 9/9/2012 7:36 PM, Channel Jumper wrote:

I could have bought a good antenna analyzer last year for $85.00 and did
not because a friend of mine wanted it and bought it for $65.00

I think they are overrated.. I've never needed or owned one so far..

I would agree with you - except for the fact that it does make life a lot easier when you are trying to get a antenna to work and you do not know what is wrong..

With a digital display it is as simple as putting the antenna together on the ground, sticking it on a pole someplace, using a feed line that is as short as possible - less then 1/4 wavelength is desireable when possible - I know at higher frequencies this is hard to do.

Turning on the Analyzer and reading the input.

Using a old style analyzer isn't as simple when you do not know the exact frequency you are tuning to...
So in the long run - I probably saved myself $40 - $50.00

A stub match question I forgot to ask is - should the end of the stub match at 1' 8 inches long be shorted on the end or open...

The web calculator I used said the Stub would be short if it was shorted and would be long if it was not - but that if it was not shorted you run the risk of the stub trying to radiate the power applied...

http://www.qsl.net/va3iul/Impedance_...e_Matching.pdf

Another broadband matching approach may use a tapered line transformer with continuously varying
characteristic impedance along its length (characteristic impedance varies continuously in a smooth
fashion).
In this case, the design obtains reflection coefficients lower than a specified tolerance at frequencies
exceeding a minimum value.
· The required length of the taper section should be about 0.5 to 1.5 of wavelength.
A different narrow-band approach involves the insertion of a shunt imaginary admittance on the line.
Often, the admittance is realized with a section (or stub) of transmission line and the technique is
commonly known as stub matching. The end of the stub line is short-circuited or open-circuited, in
order to realize an imaginary admittance.
A second narrow-band example involves the insertion of series impedance (stub) along the line.

On 9/10/2012 3:06 PM, Channel Jumper wrote:


A stub match question I forgot to ask is - should the end of the stub
match at 1' 8 inches long be shorted on the end or open...

Open. It's being used purely as a capacitor.

In article , NM5K wrote:

On 9/9/2012 7:36 PM, Channel Jumper wrote:

I could have bought a good antenna analyzer last year for $85.00 and did
not because a friend of mine wanted it and bought it for $65.00

I think they are overrated.. I've never needed or owned one so far..

I had a plain Two Meter Ringo back in the 70s, before they came out with
the "Ranger" versions. It worked well, but gain claimed was probably
DBi rather than DBd.

I also have three generations of MFJ antenna analyzers. I don't know if
they are overrated, but they are very handy. They save a lot of time
compared to using a transmitter and SWR bridge to set up an antenna.

As I understand it, they work just like the typical "reflectometer" SWR
bridge where you set forward power to full scale and read reflected
power on an SWR scale. Their VFO has its output held constant over the
frequency range, calibrated for the equivalent of the SWR bridge's full
scale setting.

The early version Channel Jumper mentioned, probably had a frequency
scale printed on the face. For critical settings, either a counter or a
calibrated receiver would be needed. Later versions have a counter
built-in, and the latest also displays antenna data on the LCD display.

Fred
K4DII

On 9/10/2012 1:46 PM, Fred McKenzie wrote:
In article , NM5K wrote:

On 9/9/2012 7:36 PM, Channel Jumper wrote:

I could have bought a good antenna analyzer last year for $85.00 and did
not because a friend of mine wanted it and bought it for $65.00

I think they are overrated.. I've never needed or owned one so far..

I had a plain Two Meter Ringo back in the 70s, before they came out with
the "Ranger" versions. It worked well, but gain claimed was probably
DBi rather than DBd.

If they rated a ringo using dbd, it would be zero.. Which doesn't
look too good in the ad's.. :|
So they use dbi to make for manlier gain figures..


I also have three generations of MFJ antenna analyzers. I don't know if
they are overrated, but they are very handy. They save a lot of time
compared to using a transmitter and SWR bridge to set up an antenna.

Dunno, I'm pretty danged fast using just an SWR meter. But I already
know what to expect, how to quickly know if I'm long or short, etc..
All the analyzers do for me is verify what I already know from
looking at the SWR meter, which in my case is built into the radio,
assuming I'm on the Icom. :/
I like not having to carry extra gadgets..

Being Long or Short is not the problem - if it was simple vertical with a ground plane with no loading coil - like a whip on a automobile - yes - you would be right.

But when dealing with a Ringo - which uses a ring to adjust the capacitive / inductive and also uses a tuning stub match - each part of the antenna works against each other..

Even now, the antenna on the VSWR Bridge shows a 2:1 match!

But I figure the Ring is probably 9 inches too shot - if the ring is 7.5 inches in diameter and needs to be 10 and the stub is too short - if it needs to be 18 inches long and is only 6....

The Antenna Analyzer would tell me the Resistive / Reactive components and all I would have to do is match them and it would work on any one frequency.

This is the problem with the Ringo - why it is not broad banded.
The main use where I live was by people who were installers of LMRS equipment that sold them along with a radio to fire companies and ambulances....

On 9/10/2012 7:40 PM, Channel Jumper wrote:
Being Long or Short is not the problem - if it was simple vertical with
a ground plane with no loading coil - like a whip on a automobile - yes
- you would be right.

No problem even with loading coils. Or when using the various
matching systems. They all act fairly predictably.


But when dealing with a Ringo - which uses a ring to adjust the
capacitive / inductive and also uses a tuning stub match - each part of
the antenna works against each other..

Even now, the antenna on the VSWR Bridge shows a 2:1 match!

Sure, it needs more inductance.

But I figure the Ring is probably 9 inches too shot - if the ring is 7.5
inches in diameter and needs to be 10 and the stub is too short - if it
needs to be 18 inches long and is only 6....

For a 10m ringo 18 inches would be about right with it tapped
about halfway. I think one I made used about a 20 inch dia turn.
But I didn't need all of it.


The Antenna Analyzer would tell me the Resistive / Reactive components
and all I would have to do is match them and it would work on any one
frequency.

Sure.. But I can do it by sense of smell.. Plenty of practice.. :/


This is the problem with the Ringo - why it is not broad banded.
The main use where I live was by people who were installers of LMRS
equipment that sold them along with a radio to fire companies and
ambulances....


It should have about the same bandwidth as most any other
half wave. I've never noticed them to really show any less
bandwidth than other designs. But then again, I'm not sure
what you mean by not broad banded. That could vary depending
on expectations.

In article ,
Channel Jumper wrote:

But I figure the Ring is probably 9 inches too shot - if the ring is 7.5
inches in diameter and needs to be 10 and the stub is too short - if it
needs to be 18 inches long and is only 6....

Channel Jumper-

You can get parts measurements for the various Ringo antennas at the
CushCraft website (Now part of MFJ!). For the Ten Meter version,
http://www.cushcraftamateur.com/Product.php?productid=AR-10. A user
manual is available by clicking on "AR-10 Downloads". I do not see a
Stub length given for the AR-10, but the AR-6 manual has a chart.

The AR-10 manual's specification says that gain is 3 dB "Ref.
Quarterwave"!

Fred
K4DII