05 Dec 2024 Io-B' / non-Io-A
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non IoA 12/05/2024 Easley, South Carolina
? ? ? ? ? non IoA from early this morning.
? ? ?John?
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Re: High Gain and Wide Bandwidth Dipole Antenna.
Claudio Alberto Pérez Celeiro
Buenos días Chris.
Me alegro de tu correo.
Estamos hablando de una antena para la? recepción de Onda Corta fundamentalmente.
También se puede utilizar para transmisión, si uno es radioaficionado utilizando el acoplador ó un Choque de Radio Frecuencia, o bien, un Balun de 1:4 o 1:1 según donde esté colocada la antena por el efecto capacitivo con casas, muros, postes de luz, etc.
Volviendo a su efectividad para recibir las se?ales de Júpiter, decir que por su Ancho de Banda, es una antena que no es crítica en su construcción, pués 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 ángulos de 45 grados. Estos tampoco son críticos, siempre que se cumpla con la medida final de cada brazo.?
Si la instalación es horizontal, es conveniente el colocarla a un 60 % de su Longitud de Onda, es decir, unos 4,40 mtrs de altura como mínimo, ó a 8,80 como maximo.?
Es importante decir, que NO ES importante que los brazos estén totalmente horizontales con respecto al suelo. No afecta a la recepción 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, así siempre tendrás una magnífica posición,? para muchas experiencias con? Júpiter y otras experiencias en Radioastronom?a etc.?
Cualquier duda que tengas, estoy a tu disposición.
Pregunta: Desde donde me escribes? Gracias y un sincero saludo.
Claudio? Madrid
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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 kΩ !!!!!? 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 Pérez Celeiro via <ecosanacion.interdimensional= [email protected]> wrote:
Queridos amigos:? Como se que hay dificultades, en la instalación de un Array de dos dipolos Jove en muchos casos, por el sitio que podamos tener, he dise?ado esta antena, la cual la podéis poner en horizontal con un Balun 1:1 al Receptor o bien con sólo un mástil y colocarla en "V" invertida a 90° aproximadamente, con lo cual no necesita Balun.?
Deseo de corazón que pueda ser una solución 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°, 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
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Germany
Standard time: UTC +1 hour
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Excellent paper on Jupiter N-Events
Here is an excellent paper on N-Events by Jim Brown, Dave Typinski and
Richard Flagg.
Tom
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Re: Dec 02 2024. Io-C N emissions - Heliotown
Great record, the N-event immediately catches the eye. Can you give a
description of what "polar" means in this context?
Sabine Hi Sabine, I am not able to explain "polar" in this context. Too complex for me unfortunately. Maybe others can help. In the meantime I googled and found this good paper on N-Events by Jim Brown, Dave Typinski and Richard Flagg. Hope this helps a little. - Tom
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Io-B with Jupiter about +half an hour outside the antenna lobe (just missed).
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Sabine
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Germany
Standard time: UTC +1 hour
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I will try my best.
?
Sabine
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Germany
Standard time: UTC +1 hour
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I really enjoyed browsing through your documentation. I spent some time searching the internet to see if the strange 4 m antennas in front of the common backplane belong to the early Telefunken "Lichtenstein" RADAR and like the "Würzburg-Riese" parabolic mirror antennas were part of Nancay's legacy from a very dark time. But I found no evidence of this. I wonder what was observed in Nancay in the 4 m band?
?
Sabine
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Germany
Standard time: UTC +1 hour
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Re: Dec 02 2024. Io-C N emissions - Heliotown
Great record, the N-event immediately catches the eye. Can you give a description of what "polar" means in this context?
?
Sabine
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Germany
Standard time: UTC +1 hour
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Thanks for the trip report Dave, and pics! Very cool. - Tom
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For those interested in some of the the details of the Nancay Radio
Astronomy
Field Station, here is a trip report from my visit there in 2016.
Hope you find it interesting!
,%20Typinski%20%20(SUG,%202016).pdf
Here is a photo gallery without explanatory text.
More info can be found here:
--
Dave
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Dec 02 2024. Io-C N emissions - Heliotown
Dec 02 2024. Io-C - Heliotown. After 0900 UTC slightly dominant left
hand circular polar N- event activity. Tom
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Sabine, you might need to add a couple
more adjectives when describing "the fan heater next door".
~Duane
On 12/4/24 10:27, Sabine Cremer wrote:
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Faint Io-A divided into two parts by the nasty fan heater
next door.
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Sabine
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Germany
Standard time: UTC +1 hour
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Faint Io-A divided into two parts by the nasty fan heater next door.
?
Sabine
--
Germany
Standard time: UTC +1 hour
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Re: non IoA 12/03/2024 Easley, South Carolina
Great catches John.? Nice modulation lanes and the "Label5B" is very interesting!
Carl
? ? ? ? ? non IoA from last evening.
? ? ?John?
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Re: non IoA 12/03/2024 Easley, South Carolina
Thanks Jim. Plenty of non IoA to go around.
On Wednesday, December 4, 2024, 1:31 AM, Jim Sky via groups.io <kh6sky@...> wrote: Nice John, So I guess non-Io-A is a thing these days. About 400kK on your strip chart. I even saw it on the dipole. Jim ? ? ? ? ? non IoA from last evening.
? ? ?John?
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Dave Typinski
Sabine Cremer
Carl Pajak Phone