On Sun, 27 Dec 2015 12:15:51 -0000, "gareth"
wrote:

There are two aspects of vector analysis under consideratiom; the first,
as for antennae measurement is to assess the amplitude and phase of
reflected
power from various circuits, which is where the interest in the VNWA arises,
but the second is the analysis of complex modulation, particularly
where there are constellations.

Antenna analyzers do NOT demodulate signals or present constellation
plots. They only measure antenna and transmission line impedances.
For a constellation plot, you'll need a service monitor with the
decoding software for whatever modulation type you want to view.
Compared to an MFJ-259/269, that will increase your test equipment
budget about 500 times. Or you can search for an RTL-SDR
implimentation that displays a constellation plot. Maybe this one:
http://yo3iiu.ro/blog/?p=1393
Lots of jitter, but cheap.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

In rec.radio.amateur.antenna Fred Roberts wrote:
On 27/12/2015 18:45, wrote:

yes...and boy do they love to make you feel small....


Sounds like sour grapes to me.

Most hams I know are eager to learn new things.

Morse is pretty new to some "hams" around here.


You do know that there has been a resurgence in interest in morse code
since the US eliminated it as a requirement?



--
Jim Pennino

In rec.radio.amateur.antenna Jeff Liebermann wrote:
On Sun, 27 Dec 2015 18:46:42 -0000, wrote:

I can not think of any antenna that modulates signals.

I talk to my antennas all the time. I only worry when they talk back.

DAM (Direct Antenna Modulation):
http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=5464640&url=http%3A%2F%2Fie eexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber% 3D5464640
http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=1339221&url=http%3A%2F%2Fie eexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber% 3D1339221
https://www.google.com/search?q=direct+antenna+modulation

Got plans for one for 40 meters?



--
Jim Pennino

On Sun, 27 Dec 2015 20:15:10 -0000, wrote:

In rec.radio.amateur.antenna Jeff Liebermann wrote:
On Sun, 27 Dec 2015 18:46:42 -0000, wrote:

I can not think of any antenna that modulates signals.

I talk to my antennas all the time. I only worry when they talk back.

DAM (Direct Antenna Modulation):
http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=5464640&url=http%3A%2F%2Fie eexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber% 3D5464640
http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=1339221&url=http%3A%2F%2Fie eexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber% 3D1339221
https://www.google.com/search?q=direct+antenna+modulation

Got plans for one for 40 meters?

Of course not. I just wanted to point out that there is such a thing
as an antenna modulator.

Skimming the literature, it seems to be made for very wide band mm
wave communications, not HF. I also don't have much of a clue as to
how it works. I think the ham radio version will need to wait until
the military and governments are done with their testing.



--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

wrote in message
...
In rec.radio.amateur.antenna Jim GM4DHJ ...
wrote:
On 26/12/2015 23:25, wrote:
In rec.radio.amateur.antenna Jim GM4DHJ ...
wrote:
On 26/12/2015 22:41, wrote:
In rec.radio.amateur.antenna Jim GM4DHJ ...
wrote:

wrote in message
...
In rec.radio.amateur.antenna Ralph Mowery

wrote:

wrote in message
...
Despite its high price and snazzy interface, does it provide any
more
useful information then the tried-and-trusted (transistorised!)
GDO?

That depends on whether or not you have the skills to utilize the
information such devices provide.


Most of the hams I have seen with the MFJ do not have the skills to
really
use it and a simple swr meter would do just as well or beter for
them.

That's a sad comment and contrary to my experience, though most of
the
hams I know are also engineers or technicians in real life.

professionals should take up another hobby ......

Why?



because they are a pain in the arse trying to lord it over
non-professionals trying to enjoy their hobby ...

You mean like when they disparage old wives tales that have been passed
down from the days of spark but contradict the laws of physics?



yes...and boy do they love to make you feel small....


Sounds like sour grapes to me.

Most hams I know are eager to learn new things.

Jim Pennino

you mean fuel guru status? ...

"Fred Roberts" wrote in message
...
On 27/12/2015 18:45, wrote:

yes...and boy do they love to make you feel small....


Sounds like sour grapes to me.

Most hams I know are eager to learn new things.

Morse is pretty new to some "hams" around here.


yes they should learn something not connected with their profession.....

professionla bounce up with snide comments ......

wrote:
In rec.radio.amateur.antenna Jim GM4DHJ ... wrote:
On 26/12/2015 23:25, wrote:
In rec.radio.amateur.antenna Jim GM4DHJ ... wrote:
On 26/12/2015 22:41, wrote:
In rec.radio.amateur.antenna Jim GM4DHJ ... wrote:

wrote in message
...
In rec.radio.amateur.antenna Ralph Mowery
wrote:

wrote in message
...
Despite its high price and snazzy interface, does it provide any more
useful information then the tried-and-trusted (transistorised!) GDO?

That depends on whether or not you have the skills to utilize the
information such devices provide.


Most of the hams I have seen with the MFJ do not have the skills to
really
use it and a simple swr meter would do just as well or beter for them.

That's a sad comment and contrary to my experience, though most of the
hams I know are also engineers or technicians in real life.

professionals should take up another hobby ......

Why?



because they are a pain in the arse trying to lord it over
non-professionals trying to enjoy their hobby ...

You mean like when they disparage old wives tales that have been passed
down from the days of spark but contradict the laws of physics?



yes...and boy do they love to make you feel small....


Sounds like sour grapes to me.

Most hams I know are eager to learn new things.


Most hams that post to uk.radio.amateur are incapable of learning new
things.

--
STC // M0TEY // twitter.com/ukradioamateur

"Stephen Thomas Cole" wrote in message
...
wrote:
In rec.radio.amateur.antenna Jim GM4DHJ ...
wrote:
On 26/12/2015 23:25, wrote:
In rec.radio.amateur.antenna Jim GM4DHJ ...
wrote:
On 26/12/2015 22:41, wrote:
In rec.radio.amateur.antenna Jim GM4DHJ ...
wrote:

wrote in message
...
In rec.radio.amateur.antenna Ralph Mowery

wrote:

wrote in message
...
Despite its high price and snazzy interface, does it provide
any more
useful information then the tried-and-trusted (transistorised!)
GDO?

That depends on whether or not you have the skills to utilize the
information such devices provide.


Most of the hams I have seen with the MFJ do not have the skills
to
really
use it and a simple swr meter would do just as well or beter for
them.

That's a sad comment and contrary to my experience, though most of
the
hams I know are also engineers or technicians in real life.

professionals should take up another hobby ......

Why?



because they are a pain in the arse trying to lord it over
non-professionals trying to enjoy their hobby ...

You mean like when they disparage old wives tales that have been passed
down from the days of spark but contradict the laws of physics?



yes...and boy do they love to make you feel small....


Sounds like sour grapes to me.

Most hams I know are eager to learn new things.


Most hams that post to uk.radio.amateur are incapable of learning new
things.

yes brian never did learn CW ....

On 27/12/2015 20:33, Jeff Liebermann wrote:


Of course not. I just wanted to point out that there is such a thing
as an antenna modulator.



I can think of one - the wind. A friend uses a VHF vertical. In very
strong winds, his signal is amplitude modulated as the thing gets bent
right over!

Les.