IoA 12/06/2024 Easley, South Carolina
Good evening: ? ? ? Weak IoA from 12/06/2024.
John
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Dec. 5, 2024 Io-B, Gainesville, Florida
Adding to the excellent John Cox recording of the N event.
Here is what I saw of the Io-B N event from Gainesville, Fl
Jupiter was a bit beyond the 3-dB point of my antenna to the East.
I also had a lot of background noise.
Francisco
|
|
Re: High Gain and Wide Bandwidth Dipole Antenna.
I have used EZNEC (and ELNEC before that) for a few
decades.? It was written by Roy Lewella, W7EL, and for years he
sold it at a modest price.? He has now retied, though, and made
his latest and most powerful version (EZNEC Pro+ v7.03) completely
free ... no advertising, no limits, no hassles.
The documentation for EZNEC is clear and comprehensive, and there
are multiple YouTube video tutorials on it ... including at least
one by Roy himself.
Aside from using it to model a particular antenna, it is immensely
useful for simply learning about how antennas work in general.?
Radiation from a wire is a function of the current and phase in
the wire at any particular point, and EZNEC can display that
information in a straightforward manner.? I have learned more
about antennas from using EZNEC than I have from any other source,
and I've been interested in antenna theory since my university
courses back in pre-history.
As far as I'm concerned, EZNEC is the gold standard for hobbyist
antenna modeling, and the Pro4/+ version (which requires an
additional module) rivals professional modeling software.
Dave? AB7E
On 12/6/2024 9:59 AM, W0LEV via
groups.io wrote:
toggle quoted message
Show quoted text
Yes,
EZNEC is an antenna design / evaluation application.?
Even
a 2-wire folded dipole has a nominal feed impedance of
300-ohms and is inappropriate to feed it with 50-ohm coax.?
Dave
- W?LEV
On Fri, Dec 6, 2024 at 4:24?PM
Chris Pannell via <chrispannell= [email protected]>
wrote:
Claudio,
Many thanks for the reply.? Please excuse my manners, I
should have apologized for not speaking Spanish before
launching into? English!! I speak a little Greek, but no
Spanish, unfortunately. Still, it is nothing that Google
Translate can't fix.?? In answer to your question, I am in
England, down in the South East, in Kent, 70 miles from
London.? I did live for 16 years in America though, I have
been back in England for 6 years. As I was in Florida, I
feel cold all the time here.? I'll put a few more details
about myself on my profile when I get round to it, but I
am primarily an optical scientist (semi- retired) , with
some background in electronics, including RF.
I see Dave-W0LEV replied saying he thought the
impedance presented at the feed was? 1.2 k Ohms, not 50
Ohms,? according to his EZNEC analysis. I have never used
this, I assume it's an RF antenna design package.? Any
comments on this?
Regards,
Chris Pannell
On 06/12/2024 02:26, W0LEV via wrote:
But
my EZNEC model shows 1.2 k¦¸ at the feed.? That would
require a 24:1 broadband transformer plus balun.? I
don't believe it is useful with 50-ohm coax at all!
I
sent out the EZNEC analysis earlier this afternoon.?
You should translate and read it!!
Dave
- W?LEV
On Fri, Dec 6, 2024 at
12:56?AM Claudio Alberto P¨¦rez Celeiro via
<ecosanacion.interdimensional= [email protected]>
wrote:
Buenos d¨ªas Chris.
Me alegro de tu correo.
Estamos hablando de una antena para
la? recepci¨®n de Onda Corta fundamentalmente.
Tambi¨¦n se puede utilizar para
transmisi¨®n, si uno es radioaficionado utilizando
el acoplador ¨® un Choque de Radio Frecuencia, o
bien, un Balun de 1:4 o 1:1 seg¨²n donde est¨¦
colocada la antena por el efecto capacitivo con
casas, muros, postes de luz, etc.
Volviendo a su efectividad para
recibir las se?ales de J¨²piter, decir que por su
Ancho de Banda, es una antena que no es cr¨ªtica en
su construcci¨®n, pu¨¦s simplemente son dos brazos
con tres hilos que se juntan en sus extremos,
tanto en el centro y la bajada del Coaxial, como
en los laterales y sus ¨¢ngulos de 45 grados. Estos
tampoco son cr¨ªticos, siempre que se cumpla con la
medida final de cada brazo.?
Si la instalaci¨®n es horizontal, es
conveniente el colocarla a un 60 % de su Longitud
de Onda, es decir, unos 4,40 mtrs de altura como
m¨ªnimo, ¨® a 8,80 como maximo.?
Es importante decir, que NO ES
importante que los brazos est¨¦n totalmente
horizontales con respecto al suelo. No afecta a la
recepci¨®n de la misma de una forma significativa.
En cuanto a como colocarla en el
terreno, es simplemente como bien dices, ponerla
de Este a Oeste, as¨ª siempre tendr¨¢s una magn¨ªfica
posici¨®n,? para muchas experiencias con? J¨²piter y
otras experiencias en Radioastronom?a etc.?
Cualquier duda que tengas, estoy a
tu disposici¨®n.
Pregunta: Desde donde me escribes?
Gracias y un sincero saludo.
Claudio?
Madrid
--
--
|
Re: High Gain and Wide Bandwidth Dipole Antenna.
Thanks, Dave, AB7E, for you pointers.? I stayed clear of the "high gain" issue as I thought that should be obvious.? But, evidently, not so.....
Again, thank you.
Dave - W?LEV
toggle quoted message
Show quoted text
There is a fundamental dichotomy here in this entire
discussion.? While a wide bandwidth dipole may perform adequately
for somebody depending upon their criteria, there is no such thing
as a high gain wide bandwidth antenna of any type, at least not
relative to a narrow band antenna.
There is a lot of misinformation here in the first place.?
a.? An inverted-V configuration still needs a balun to prevent
unwanted noise pickup on the shield of the coax.?
b.? As W0LEV has pointed out, the SWR of this antenna is
unacceptably large without some transformation to change that
condition.?
c.? A short single element antenna might be "broadband" simply
because it performs equally poorly over a wide range of
frequencies, but there is no way that it will be high gain at any
of them.? Physics is physics.
Like W0LEV, I can model most antennas in EZNEC+Pro.
Dave?? AB7E
On 12/6/2024 9:23 AM, Chris Pannell via
wrote:
Claudio,
Many thanks for the reply.? Please
excuse my manners, I should have apologized for not speaking
Spanish before launching into? English!! I speak a little Greek,
but no Spanish, unfortunately. Still, it is nothing that Google
Translate can't fix.?? In answer to your question, I am in
England, down in the South East, in Kent, 70 miles from London.?
I did live for 16 years in America though, I have been back in
England for 6 years. As I was in Florida, I feel cold all the
time here.? I'll put a few more details about myself on my
profile when I get round to it, but I am primarily an optical
scientist (semi- retired) , with some background in electronics,
including RF.
I see Dave-W0LEV replied saying he
thought the impedance presented at the feed was? 1.2 k Ohms, not
50 Ohms,? according to his EZNEC analysis. I have never used
this, I assume it's an RF antenna design package.? Any comments
on this?
Regards,
Chris Pannell
On 06/12/2024 02:26, W0LEV via
wrote:
But
my EZNEC model shows 1.2 k¦¸ at the feed.? That would require
a 24:1 broadband transformer plus balun.? I don't believe it
is useful with 50-ohm coax at all!
I
sent out the EZNEC analysis earlier this afternoon.? You
should translate and read it!!
Dave
- W?LEV
On Fri, Dec 6, 2024 at
12:56?AM Claudio Alberto P¨¦rez Celeiro via
<ecosanacion.interdimensional= [email protected]>
wrote:
Buenos d¨ªas Chris.
Me alegro de tu correo.
Estamos hablando de una antena para la?
recepci¨®n de Onda Corta fundamentalmente.
Tambi¨¦n se puede utilizar para
transmisi¨®n, si uno es radioaficionado utilizando el
acoplador ¨® un Choque de Radio Frecuencia, o bien, un
Balun de 1:4 o 1:1 seg¨²n donde est¨¦ colocada la antena
por el efecto capacitivo con casas, muros, postes de
luz, etc.
Volviendo a su efectividad para recibir
las se?ales de J¨²piter, decir que por su Ancho de Banda,
es una antena que no es cr¨ªtica en su construcci¨®n, pu¨¦s
simplemente son dos brazos con tres hilos que se juntan
en sus extremos, tanto en el centro y la bajada del
Coaxial, como en los laterales y sus ¨¢ngulos de 45
grados. Estos tampoco son cr¨ªticos, siempre que se
cumpla con la medida final de cada brazo.?
Si la instalaci¨®n es horizontal, es
conveniente el colocarla a un 60 % de su Longitud de
Onda, es decir, unos 4,40 mtrs de altura como m¨ªnimo, ¨®
a 8,80 como maximo.?
Es importante decir, que NO ES importante
que los brazos est¨¦n totalmente horizontales con
respecto al suelo. No afecta a la recepci¨®n de la misma
de una forma significativa.
En cuanto a como colocarla en el terreno,
es simplemente como bien dices, ponerla de Este a Oeste,
as¨ª siempre tendr¨¢s una magn¨ªfica posici¨®n,? para muchas
experiencias con? J¨²piter y otras experiencias en
Radioastronom?a etc.?
Cualquier duda que tengas, estoy a tu
disposici¨®n.
Pregunta: Desde donde me escribes?
Gracias y un sincero saludo.
Claudio?
Madrid
--
|
Re: High Gain and Wide Bandwidth Dipole Antenna.
There is a fundamental dichotomy here in this entire
discussion.? While a wide bandwidth dipole may perform adequately
for somebody depending upon their criteria, there is no such thing
as a high gain wide bandwidth antenna of any type, at least not
relative to a narrow band antenna.
There is a lot of misinformation here in the first place.?
a.? An inverted-V configuration still needs a balun to prevent
unwanted noise pickup on the shield of the coax.?
b.? As W0LEV has pointed out, the SWR of this antenna is
unacceptably large without some transformation to change that
condition.?
c.? A short single element antenna might be "broadband" simply
because it performs equally poorly over a wide range of
frequencies, but there is no way that it will be high gain at any
of them.? Physics is physics.
Like W0LEV, I can model most antennas in EZNEC+Pro.
Dave?? AB7E
On 12/6/2024 9:23 AM, Chris Pannell via
groups.io wrote:
toggle quoted message
Show quoted text
Claudio,
Many thanks for the reply.? Please
excuse my manners, I should have apologized for not speaking
Spanish before launching into? English!! I speak a little Greek,
but no Spanish, unfortunately. Still, it is nothing that Google
Translate can't fix.?? In answer to your question, I am in
England, down in the South East, in Kent, 70 miles from London.?
I did live for 16 years in America though, I have been back in
England for 6 years. As I was in Florida, I feel cold all the
time here.? I'll put a few more details about myself on my
profile when I get round to it, but I am primarily an optical
scientist (semi- retired) , with some background in electronics,
including RF.
I see Dave-W0LEV replied saying he
thought the impedance presented at the feed was? 1.2 k Ohms, not
50 Ohms,? according to his EZNEC analysis. I have never used
this, I assume it's an RF antenna design package.? Any comments
on this?
Regards,
Chris Pannell
On 06/12/2024 02:26, W0LEV via
groups.io wrote:
But
my EZNEC model shows 1.2 k¦¸ at the feed.? That would require
a 24:1 broadband transformer plus balun.? I don't believe it
is useful with 50-ohm coax at all!
I
sent out the EZNEC analysis earlier this afternoon.? You
should translate and read it!!
Dave
- W?LEV
On Fri, Dec 6, 2024 at
12:56?AM Claudio Alberto P¨¦rez Celeiro via
<ecosanacion.interdimensional= [email protected]>
wrote:
Buenos d¨ªas Chris.
Me alegro de tu correo.
Estamos hablando de una antena para la?
recepci¨®n de Onda Corta fundamentalmente.
Tambi¨¦n se puede utilizar para
transmisi¨®n, si uno es radioaficionado utilizando el
acoplador ¨® un Choque de Radio Frecuencia, o bien, un
Balun de 1:4 o 1:1 seg¨²n donde est¨¦ colocada la antena
por el efecto capacitivo con casas, muros, postes de
luz, etc.
Volviendo a su efectividad para recibir
las se?ales de J¨²piter, decir que por su Ancho de Banda,
es una antena que no es cr¨ªtica en su construcci¨®n, pu¨¦s
simplemente son dos brazos con tres hilos que se juntan
en sus extremos, tanto en el centro y la bajada del
Coaxial, como en los laterales y sus ¨¢ngulos de 45
grados. Estos tampoco son cr¨ªticos, siempre que se
cumpla con la medida final de cada brazo.?
Si la instalaci¨®n es horizontal, es
conveniente el colocarla a un 60 % de su Longitud de
Onda, es decir, unos 4,40 mtrs de altura como m¨ªnimo, ¨®
a 8,80 como maximo.?
Es importante decir, que NO ES importante
que los brazos est¨¦n totalmente horizontales con
respecto al suelo. No afecta a la recepci¨®n de la misma
de una forma significativa.
En cuanto a como colocarla en el terreno,
es simplemente como bien dices, ponerla de Este a Oeste,
as¨ª siempre tendr¨¢s una magn¨ªfica posici¨®n,? para muchas
experiencias con? J¨²piter y otras experiencias en
Radioastronom?a etc.?
Cualquier duda que tengas, estoy a tu
disposici¨®n.
Pregunta: Desde donde me escribes?
Gracias y un sincero saludo.
Claudio?
Madrid
--
|
Re: High Gain and Wide Bandwidth Dipole Antenna.
Yes, EZNEC is an antenna design / evaluation application.?
Even a 2-wire folded dipole has a nominal feed impedance of 300-ohms and is inappropriate to feed it with 50-ohm coax.?
Dave - W?LEV
toggle quoted message
Show quoted text
On Fri, Dec 6, 2024 at 4:24?PM Chris Pannell via <chrispannell= [email protected]> wrote:
Claudio,
Many thanks for the reply.? Please
excuse my manners, I should have apologized for not speaking
Spanish before launching into? English!! I speak a little Greek,
but no Spanish, unfortunately. Still, it is nothing that Google
Translate can't fix.?? In answer to your question, I am in
England, down in the South East, in Kent, 70 miles from London.? I
did live for 16 years in America though, I have been back in
England for 6 years. As I was in Florida, I feel cold all the time
here.? I'll put a few more details about myself on my profile when
I get round to it, but I am primarily an optical scientist (semi-
retired) , with some background in electronics, including RF.
I see Dave-W0LEV replied saying he
thought the impedance presented at the feed was? 1.2 k Ohms, not
50 Ohms,? according to his EZNEC analysis. I have never used this,
I assume it's an RF antenna design package.? Any comments on this?
Regards,
Chris Pannell
On 06/12/2024 02:26, W0LEV via
wrote:
But
my EZNEC model shows 1.2 k¦¸ at the feed.? That would require a
24:1 broadband transformer plus balun.? I don't believe it is
useful with 50-ohm coax at all!
I
sent out the EZNEC analysis earlier this afternoon.? You
should translate and read it!!
Dave
- W?LEV
On Fri, Dec 6, 2024 at
12:56?AM Claudio Alberto P¨¦rez Celeiro via
<ecosanacion.interdimensional= [email protected]>
wrote:
Buenos d¨ªas Chris.
Me alegro de tu correo.
Estamos hablando de una antena para la?
recepci¨®n de Onda Corta fundamentalmente.
Tambi¨¦n se puede utilizar para transmisi¨®n,
si uno es radioaficionado utilizando el acoplador ¨® un
Choque de Radio Frecuencia, o bien, un Balun de 1:4 o 1:1
seg¨²n donde est¨¦ colocada la antena por el efecto
capacitivo con casas, muros, postes de luz, etc.
Volviendo a su efectividad para recibir las
se?ales de J¨²piter, decir que por su Ancho de Banda, es
una antena que no es cr¨ªtica en su construcci¨®n, pu¨¦s
simplemente son dos brazos con tres hilos que se juntan en
sus extremos, tanto en el centro y la bajada del Coaxial,
como en los laterales y sus ¨¢ngulos de 45 grados. Estos
tampoco son cr¨ªticos, siempre que se cumpla con la medida
final de cada brazo.?
Si la instalaci¨®n es horizontal, es
conveniente el colocarla a un 60 % de su Longitud de Onda,
es decir, unos 4,40 mtrs de altura como m¨ªnimo, ¨® a 8,80
como maximo.?
Es importante decir, que NO ES importante
que los brazos est¨¦n totalmente horizontales con respecto
al suelo. No afecta a la recepci¨®n de la misma de una
forma significativa.
En cuanto a como colocarla en el terreno, es
simplemente como bien dices, ponerla de Este a Oeste, as¨ª
siempre tendr¨¢s una magn¨ªfica posici¨®n,? para muchas
experiencias con? J¨²piter y otras experiencias en
Radioastronom?a etc.?
Cualquier duda que tengas, estoy a tu
disposici¨®n.
Pregunta: Desde donde me escribes?
Gracias y un sincero saludo.
Claudio?
Madrid
--
|
Not the best catch ever.
?
Sabine
--
Germany Standard time: UTC +1 hour
|
Re: Dec 02 2024. Io-C N emissions - Heliotown
Oh darn, only a non-native speaker can do that! I associated the "polar" to the "N-event". :-(
Sorry, Tom! Thanks for the tip, Dave! And thanks to Tom pointing out the interesting publication.
?
Sabine
--
Germany Standard time: UTC +1 hour
|
Re: High Gain and Wide Bandwidth Dipole Antenna.
Claudio,
Many thanks for the reply.? Please
excuse my manners, I should have apologized for not speaking
Spanish before launching into? English!! I speak a little Greek,
but no Spanish, unfortunately. Still, it is nothing that Google
Translate can't fix.?? In answer to your question, I am in
England, down in the South East, in Kent, 70 miles from London.? I
did live for 16 years in America though, I have been back in
England for 6 years. As I was in Florida, I feel cold all the time
here.? I'll put a few more details about myself on my profile when
I get round to it, but I am primarily an optical scientist (semi-
retired) , with some background in electronics, including RF.
I see Dave-W0LEV replied saying he
thought the impedance presented at the feed was? 1.2 k Ohms, not
50 Ohms,? according to his EZNEC analysis. I have never used this,
I assume it's an RF antenna design package.? Any comments on this?
Regards,
Chris Pannell
On 06/12/2024 02:26, W0LEV via
groups.io wrote:
toggle quoted message
Show quoted text
But
my EZNEC model shows 1.2 k¦¸ at the feed.? That would require a
24:1 broadband transformer plus balun.? I don't believe it is
useful with 50-ohm coax at all!
I
sent out the EZNEC analysis earlier this afternoon.? You
should translate and read it!!
Dave
- W?LEV
On Fri, Dec 6, 2024 at
12:56?AM Claudio Alberto P¨¦rez Celeiro via
<ecosanacion.interdimensional= [email protected]>
wrote:
Buenos d¨ªas Chris.
Me alegro de tu correo.
Estamos hablando de una antena para la?
recepci¨®n de Onda Corta fundamentalmente.
Tambi¨¦n se puede utilizar para transmisi¨®n,
si uno es radioaficionado utilizando el acoplador ¨® un
Choque de Radio Frecuencia, o bien, un Balun de 1:4 o 1:1
seg¨²n donde est¨¦ colocada la antena por el efecto
capacitivo con casas, muros, postes de luz, etc.
Volviendo a su efectividad para recibir las
se?ales de J¨²piter, decir que por su Ancho de Banda, es
una antena que no es cr¨ªtica en su construcci¨®n, pu¨¦s
simplemente son dos brazos con tres hilos que se juntan en
sus extremos, tanto en el centro y la bajada del Coaxial,
como en los laterales y sus ¨¢ngulos de 45 grados. Estos
tampoco son cr¨ªticos, siempre que se cumpla con la medida
final de cada brazo.?
Si la instalaci¨®n es horizontal, es
conveniente el colocarla a un 60 % de su Longitud de Onda,
es decir, unos 4,40 mtrs de altura como m¨ªnimo, ¨® a 8,80
como maximo.?
Es importante decir, que NO ES importante
que los brazos est¨¦n totalmente horizontales con respecto
al suelo. No afecta a la recepci¨®n de la misma de una
forma significativa.
En cuanto a como colocarla en el terreno, es
simplemente como bien dices, ponerla de Este a Oeste, as¨ª
siempre tendr¨¢s una magn¨ªfica posici¨®n,? para muchas
experiencias con? J¨²piter y otras experiencias en
Radioastronom?a etc.?
Cualquier duda que tengas, estoy a tu
disposici¨®n.
Pregunta: Desde donde me escribes?
Gracias y un sincero saludo.
Claudio?
Madrid
--
|
Re: IoB 12/05/2024 Easley, South Carolina
Really nice N event trains of S-bursts, John! -- Dave
toggle quoted message
Show quoted text
On 12/5/24 19:20, AOL via groups.io wrote: > Good evening: >? ? ? ? ? IoB from early this morning. N events included, making the paper that > Tom sent very timely. Thanks. > >? ? ? John >
|
Re: High Gain and Wide Bandwidth Dipole Antenna.
But my EZNEC model shows 1.2 k¦¸ at the feed.? That would require a 24:1 broadband transformer plus balun.? I don't believe it is useful with 50-ohm coax at all!
I sent out the EZNEC analysis earlier this afternoon.? You should translate and read it!!
Dave - W?LEV
On Fri, Dec 6, 2024 at 12:56?AM Claudio Alberto P¨¦rez Celeiro via <ecosanacion.interdimensional= [email protected]> wrote:
toggle quoted message
Show quoted text
Buenos d¨ªas Chris.
Me alegro de tu correo.
Estamos hablando de una antena para la? recepci¨®n de Onda Corta fundamentalmente.
Tambi¨¦n se puede utilizar para transmisi¨®n, si uno es radioaficionado utilizando el acoplador ¨® un Choque de Radio Frecuencia, o bien, un Balun de 1:4 o 1:1 seg¨²n donde est¨¦ colocada la antena por el efecto capacitivo con casas, muros, postes de luz, etc.
Volviendo a su efectividad para recibir las se?ales de J¨²piter, decir que por su Ancho de Banda, es una antena que no es cr¨ªtica en su construcci¨®n, pu¨¦s simplemente son dos brazos con tres hilos que se juntan en sus extremos, tanto en el centro y la bajada del Coaxial, como en los laterales y sus ¨¢ngulos de 45 grados. Estos tampoco son cr¨ªticos, siempre que se cumpla con la medida final de cada brazo.?
Si la instalaci¨®n es horizontal, es conveniente el colocarla a un 60 % de su Longitud de Onda, es decir, unos 4,40 mtrs de altura como m¨ªnimo, ¨® a 8,80 como maximo.?
Es importante decir, que NO ES importante que los brazos est¨¦n totalmente horizontales con respecto al suelo. No afecta a la recepci¨®n de la misma de una forma significativa.
En cuanto a como colocarla en el terreno, es simplemente como bien dices, ponerla de Este a Oeste, as¨ª siempre tendr¨¢s una magn¨ªfica posici¨®n,? para muchas experiencias con? J¨²piter y otras experiencias en Radioastronom?a etc.?
Cualquier duda que tengas, estoy a tu disposici¨®n.
Pregunta: Desde donde me escribes? Gracias y un sincero saludo.
Claudio? Madrid
|
Re: IoB 12/05/2024 Easley, South Carolina
Really nice N event trains of S-bursts, John! -- Dave
toggle quoted message
Show quoted text
On 12/5/24 19:20, AOL via groups.io wrote: Good evening: IoB from early this morning. N events included, making the paper that Tom sent very timely. Thanks.
John
|
05 Dec 2024 Io-B' / non-Io-A
|
non IoA 12/05/2024 Easley, South Carolina
? ? ? ? ? non IoA from early this morning.
? ? ?John?
|
Re: High Gain and Wide Bandwidth Dipole Antenna.
Claudio Alberto P¨¦rez Celeiro
Buenos d¨ªas Chris.
Me alegro de tu correo.
Estamos hablando de una antena para la? recepci¨®n de Onda Corta fundamentalmente.
Tambi¨¦n se puede utilizar para transmisi¨®n, si uno es radioaficionado utilizando el acoplador ¨® un Choque de Radio Frecuencia, o bien, un Balun de 1:4 o 1:1 seg¨²n donde est¨¦ colocada la antena por el efecto capacitivo con casas, muros, postes de luz, etc.
Volviendo a su efectividad para recibir las se?ales de J¨²piter, decir que por su Ancho de Banda, es una antena que no es cr¨ªtica en su construcci¨®n, pu¨¦s simplemente son dos brazos con tres hilos que se juntan en sus extremos, tanto en el centro y la bajada del Coaxial, como en los laterales y sus ¨¢ngulos de 45 grados. Estos tampoco son cr¨ªticos, siempre que se cumpla con la medida final de cada brazo.?
Si la instalaci¨®n es horizontal, es conveniente el colocarla a un 60 % de su Longitud de Onda, es decir, unos 4,40 mtrs de altura como m¨ªnimo, ¨® a 8,80 como maximo.?
Es importante decir, que NO ES importante que los brazos est¨¦n totalmente horizontales con respecto al suelo. No afecta a la recepci¨®n de la misma de una forma significativa.
En cuanto a como colocarla en el terreno, es simplemente como bien dices, ponerla de Este a Oeste, as¨ª siempre tendr¨¢s una magn¨ªfica posici¨®n,? para muchas experiencias con? J¨²piter y otras experiencias en Radioastronom?a etc.?
Cualquier duda que tengas, estoy a tu disposici¨®n.
Pregunta: Desde donde me escribes? Gracias y un sincero saludo.
Claudio? Madrid
|
IoB 12/05/2024 Easley, South Carolina
? ? ? ? IoB from early this morning. N events included, making the paper that Tom sent very timely. Thanks.
? ? ?John
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Re: High Gain and Wide Bandwidth Dipole Antenna.
I modeled your proposed antenna from the sketch using the latest and free version of EZNEC.??
The parameters I used are as follows:
Conductivity:? 0.005 S/m Relative Dielectric Constant:? 10? (well wateres grass lawn)
Height:? 15-feet? (4.6-m)
You might thing twice about this configuration.
The feed impedance modeled as follows.? This is for a 1200-ohm resistance!!!!!? It's a LONG WAYS from 50-ohms and standard coax!!!!!
For a 2:1 SWR (at 1200-ohm feed impedance) ???????? 16.4 through 22.9 MHz For a 3:1 SWR (at 1200-ohm feed impedance)????????? 15.4 through 25.0 MHz
Again, the 2:1 and 3:1 SWR are with a resistive load of 1.2 k¦¸ !!!!!? NOT 50 OHMS!!!!
The following plot is with a 1200-ohm load.
Here you are with a standard 50-ohm load - nearly infinite SWR!!
Feeding this directly with even a 1:1 balun will introduce a whole lot of loss!!!? Not appropriate for a Jupiter Antenna.
Dave - W?LEV
On Sun, Dec 1, 2024 at 4:28?PM Claudio Alberto P¨¦rez Celeiro via <ecosanacion.interdimensional= [email protected]> wrote:
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Queridos amigos:? Como se que hay dificultades, en la instalaci¨®n de un Array de dos dipolos Jove en muchos casos, por el sitio que podamos tener, he dise?ado esta antena, la cual la pod¨¦is poner en horizontal con un Balun 1:1 al Receptor o bien con s¨®lo un m¨¢stil y colocarla en "V" invertida a 90¡ã aproximadamente, con lo cual no necesita Balun.?
Deseo de coraz¨®n que pueda ser una soluci¨®n efectiva para aquellos que no tienen mucho espacio en sus casas.
Un abrazo? Claudio Alberto? NR - Madrid EA4AND?
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Dear friends:
As I know that there are difficulties in installing a Jove two-dipole array in many cases, due to the space we may have, I have designed this antenna, which you can put horizontally with a 1:1 Balun to the Receiver or with just a mast and place it in an inverted "V" at approximately 90¡ã, which means it does not need a Balun.
I sincerely hope that it can be an effective solution for those who do not have much space in their homes.
A hug
Claudio Alberto NR - Madrid EA4AND
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Re: High Gain and Wide Bandwidth Dipole Antenna.
Claudio - a few questions:? Is the orientation of the array critical with respect to Jupiter, i.e. should the 3 wires be at 90 degrees to Jupiter? Or just align it east-west with the 3 wires at the same height from the ground? Also, is the overall height important?? Finally, do the tapered ends actually come in at 45 degrees as shown?
It looks a very interesting design.
Regards,
Chris Pannell
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Re: Dec 02 2024. Io-C N emissions - Heliotown
Hi Sabine,
I think in Tom's message it's just a non-standard abbreviation for "polarization" -- as in "left-hand circular polarization" -- also seen as "LCP" in the standard abbreviation. -- Dave
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On 12/5/24 03:10, Sabine Cremer wrote: Great record, the N-event immediately catches the eye. Can you give a description of what "polar" means in this context? Sabine --
Germany Standard time: UTC +1 hour
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