Feeding System found it = Mosley
 

lu6etj wrote in news:90c5c494-45a0-476c-8f9e-
:

On 13 mayo, 02:11, Owen Duffy wrote:
lu6etj wrote in news:e57e2fbf-75a6-4014-a190-
:

Adding an ideal reactance of -155 ohms

Bit is not a fixed reactance, it is a transmission line element, and
you
should model it as that, even if lossless.

Owen

;=D Easy and quick 50 ohm transmission line 0.05121 lambda (-150
ohms) replacement for old fix reactance in the same segment = ¡Same
result...! and now... I'm go to ZZZZZ

If you specified it in wavelengths, wouldn't that have a constant
reactance.

The real stub is a fixed physical length, and its reactance changes with
frequency.

Owen

Feeding System found it = Mosley
 

On 13 mayo, 04:59, Owen Duffy wrote:
lu6etj wrote in news:90c5c494-45a0-476c-8f9e-
:





On 13 mayo, 02:11, Owen Duffy wrote:
lu6etj wrote in news:e57e2fbf-75a6-4014-a190-
:

Adding an ideal reactance of -155 ohms

Bit is not a fixed reactance, it is a transmission line element, and
you
should model it as that, even if lossless.

Owen

;=D *Easy and quick 50 ohm transmission line 0.05121 lambda *(-150
ohms) replacement for old fix reactance in the same segment = ¡Same
result...! *and now... I'm go to ZZZZZ

If you specified it in wavelengths, wouldn't that have a constant
reactance.

The real stub is a fixed physical length, and its reactance changes with
frequency.

Owen- Ocultar texto de la cita -

- Mostrar texto de la cita -

Good morning (here) Mr. Duffy

It was in meters...

Please, remember the proposition to validate or refute. Once validated
(if it is), then we could think about details

You know, I was not trying to find out if it is the best matching
method but whether it is a viable method. For example: In precedent
post I said I was using a "coarsely" reactance for a basic hypothesis
test because my dictionary suggest that word, perhaps I should have
written: rudely? approximately?

SRI, this is not my natural language and I may not adequately
explained my goal...

Miguel Ghezzi LU6ETJ

Feeding System found it = Mosley
 

On Thu, 13 May 2010 05:11:58 -0700 (PDT), lu6etj
wrote:

I was using a "coarsely" reactance for a basic hypothesis
test because my dictionary suggest that word, perhaps I should have
written: rudely? approximately?

Hi Miguel,

Coarse,
Rude,
Approximate
are the correct forms as adjectives that describe things.

Coarsely,
Rudely,
Approximately
are forms of adverbs that describe actions.

Any of the six words are easily understood in context.

I understand your goal. Newsgroup behavior is about speaking more
completely to the larger audience. Thus, other's will add commentary
to your goal.

73's
Richard Clark, KB7QHC

Feeding System found it = Mosley
 

On 13 mayo, 13:14, Richard Clark wrote:
On Thu, 13 May 2010 05:11:58 -0700 (PDT), lu6etj
wrote:

I was using a "coarsely" reactance for a basic hypothesis
test because my dictionary suggest that word, perhaps I should have
written: rudely? approximately?

Hi Miguel,

Coarse,
Rude,
Approximate
are the correct forms as adjectives that describe things.

Coarsely,
Rudely,
Approximately
are forms of adverbs that describe actions.

Any of the six words are easily understood in context.

I understand your goal. *Newsgroup behavior is about speaking more
completely to the larger audience. *Thus, other's will add commentary
to your goal.

73's
Richard Clark, KB7QHC

Thank you very much Richard I am happy to know it:

When I translate a ham technical article from spanish to english it is
worse because I have not any feedback to check if it has good sense to
english language readers.
I know you say about newsgropus, and that makes very interesting to me
read this. I like the way in that you squeeze the juice of each
topic :) Thanks to it I have understood very good things from all of
you...

73

Miguel

Feeding System found it = Mosley
 

Owen Duffy wrote:
lu6etj wrote in news:e57e2fbf-75a6-4014-a190-
:

Adding an ideal reactance of -155 ohms

Bit is not a fixed reactance, it is a transmission line element, and you
should model it as that, even if lossless.

Owen
In the Mosley case, judging from the writeup at the link supplied a few
days ago, the series capacitor is sufficiently short (a few inches?),
that it's probably safe to consider it a lumped element. Isn't it just a
wire in the middle of a tube.. essentially a coaxial capacitor.

Feeding System found it = Mosley
 

On 13 mayo, 15:38, Jim Lux wrote:
Owen Duffy wrote:
lu6etj wrote in news:e57e2fbf-75a6-4014-a190-
:

Adding an ideal reactance of -155 ohms

Bit is not a fixed reactance, it is a transmission line element, and you
should model it as that, even if lossless.

Owen

In the Mosley case, judging from the writeup at the link supplied a few
days ago, the series capacitor is sufficiently short (a few inches?),
that it's probably safe to consider it a lumped element. Isn't it just a
wire in the middle of a tube.. essentially a coaxial capacitor.

True. Since delta f is small (aprox 2%), considering it a plain
condenser, reactance variation between 14 and 14.3 MHz is from 150 to
146.6 ohm; considering it a transmission line variation is from 150 to
146.8 -worthless-
In the worst case, thinking it as a coaxial condenser could have a
higher error on cable length calculation more than in the reactancev
variation with frequency.

Feeding System found it = Mosley
 

I think: If your assumed numbers were those of the Mosley beam, its
SWR would be 4:1(without losses), and with losses included she would
be ¡a very nasty antenna!. I think the ham buyers would not be very
happy with such a poor antenna on both cases :)


I am not saying that the Mosley antenna has a bad SWR or that is has a low gain.

I am just saying that the explanation they give for their matching arrangement
is not convincing. And this leads me to believe that their matching arrangement
is not equivalent to a simple capacitor in series...

73

Tony I0JX

Feeding System found it = Mosley
 

On Thu, 13 May 2010 10:56:23 -0700 (PDT), lu6etj
wrote:

When I translate a ham technical article from spanish to english it is
worse because I have not any feedback to check if it has good sense to
english language readers.

Hi Miguel,

Feel free to send me what you are working on for feedback.

73's
Richard Clark, KB7QHC