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interferometry at 35 MHz


By WimApon - Posted on 07 January 2010

Hi, i am busy with adding interferometry at 35 MHz. I use 2 inverted V beams on a baseline West-East with a 140 m distance between them. i can locate Cassiopeia A within 1 degree. I like to change to phasing interferometry. Therefore i will build 2 coherent receivers like the jove ones. My problem is: i must have AD-converters, fast anough to get 3 samples per sinus at 6 KHz. They told me, a computer sound cart will do the job..... Can anybody help me with information... software etc. The recording will go for about 1 second. When i get two files with the data from my two antennas. i like to use my own written programs's to do a lot of calculations ..... My goal is to make a map of the sky at 35 MHz... Anybody can help me??? Thanks For more information about my results etc.. see my site http://home.kpn.nl/apon001/huis.htm Go then to the menu-item interferometry... it is in Dutch.. but later starts Englisch. You can see some photopgraphs and graphs. Wim

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Okee Ketty, that is very nice.
Greetings Wim

3-1-201q1 Sorry Jim, i missed your questions: I do not know very much of what you are asking. I do receive noise coming from the suns's flares. That signals are very strong related to jupiter, cassiopeia-A or Cygnus-A signals. i only received one strong sun's flare on 1 august 2010 at 09:00 UTC) with my phasing interferometry rig. It gave a wonderfull curve over the day. But it was not long enough to calculate its position at the sky. I think..but i am not sure.. that all kinds of magnetic events hitting the earth's atmosfere generate no radio signals on my receiving frequencies (31 to 35 MHz) What we call "radio interference" is caused, as far as i know by the disturbance of the ionosied layers around the earth. ( for example the E and F layer) this results in the reiving of other signals from other places than normal, which give the interference with the normal signals. So, Jim.... this is all i can tell you. Wim
a solar flare that hits our earths magnetosphere , dose it generate frequencies that we can detect from lets say the distance of jupiter or further with a interferometry radio telescope set up of some kind ? what if other high energies intereact with the magnetosphere, ionosphere or other portion of the earths atmosphere .....for example high energies of x-rays,cosmic and gamma rays....will these generate detectable interaction for some type of interferometry radio telescope set up from great distances......am curious if this could be a method with current technology to do a faster location of earth like to jupiter like magnetic fields and other portions of their atmospheres on exo-planets.....sorry if this is totally off the mark but i know that magnetic fields if crossed, broken or snapped there is a noticable reaction called radio interferance.....with that in mind there is a certain general reaction pattern that will emerge....please excuse the mispelling .....just wanted to know the answer because radio interferance generated from earths' magnetic field is a great deal more than lets say a microwave oven on a f.m. radio station transmission.....jupiter or larger would generate even greater interferance.....my email address is marsjupi777@gmail.com if i am not on here....thanks for any responce up front....jim
16-11-2010 My phasing interferometry radio-telescope is ready and running. It works on 31.0 MHz. At the moment i can make some maps of the sky. How good they are is not known..... You can follow the process at my site. Items: phasing interferometry and now working on. Every few days i add my last findings on: now working on. The phasing interferometry gives a lot more detail than the adding interferometry. Disadvantage is that i had to write thousends of lines of software including 2D-FFT programs. Now i understand why they call this kind of telescopes software telescopes!

At certain times i receive strong disturbances.
for example:
7 march 2011 14:30 to 16:00 UTC
2 april 2011 07:00 to 12:00 UTC
28 april 2011 17:30 to 19:30 UTC
7 may 2011 08:00 to 13:00 UTC
10 may 2011 18:00 to 19:00 and 21:55 to 24:00 UTC
11 may 2011 0:00 to 04:00 UTC
12 may 2011 11:05 to 12:20 UTC
14 may 2011 08:30 to 13:00 UTC and 20:10 to 20:40 UTC
15 may 2011 15:00 to 16:20 UTC
16 may 2011 8:40 to 09:00 UTC

I think , this can be Jupiter...

Can somebody confirm this??

Wim

In two cases i do hear the beach-waves type of noise.....
14-5-2011 20:20 TO 21:07 UTC
15-5-2011 02:16 TO 02:42 UTC and 15:32 UTC and 16:12 to 16:17

i can listen to the recordings because i put the data in
.wav files.

Hi Wim. I have seen your site before web. Very nice studies.We would like to try to work as an example of this.

This program can help you to observe Jupiter. Enter your own coordinates, time set, the active storms, on the noise. IO-A,-B, IO, IO-A Look at the duration of observation. Map support is available.

Best regards, 73

Ruha USLU
TAMSAT- Turkish Amateur Satellite Technologies Organization (AMSAT-TR)
Network Team
Young Radio Astnonomy Team TAMSAT/GRAT Communications Officer
tb2nmr@tamsat.org.tr

Link: (TR)
http://www.tamsat.org.tr/as/tamsat-grat-bilim-teknik/187-tamsat-grat-rad...

Link: (Software)
http://www.radiosky.com/rjpro3ishere.html

Hi TB2NMR
Thanks, i know the existence op that program.
Point is, i do not like to buy a commercial program.....
And it gives much to much information.
and i only have to see once that my disturbances are coming
from Jupiter.. than i am happy.
If you have the radio sky program, can you please look one time
for me to my dates and times above....
That would be great.

If you are starting measurements as i do, i would be delighted to help you.

73
Wim

Can you send me an e-mail with the coordinate information?
tb2nmr@tamsat.org.tr

Well, my coordinates are ( +/-) 53 degrees 16 minutes 20 seconds North and 6 degrees 50 minutes and 0 seconds East.

Wim

Hi Wim,
You can go to the NASA data archive site http://jovearchive.gsfc.nasa.gov/ to see when others recorded activity from Jupiter.

Thank you very much...That would be great,
but the link does not work....

now, 20-5-2011 the site is running... that's great!