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Author Topic: Radio astronomy.  (Read 38645 times)

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Offline starf

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Re: Radio astronomy.
« Reply #210 on: 16:59:41, 04 January, 2008 »
nothing here dave. the receiver only operates in WFM, FM and AM not USB, LSB or CW. following the advice of david entwhistle, i tuned to the audio carrier on the swedish transmitter vännäs 53.5700 MHz. the problem is that the output on the audio signal is 3Kw compared to the 60Kw power of the visual. didnt hear anything either unfortunately.
david has been very helpful in providing a great deal of interesting advice.

Offline davemahoney

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Re: Radio astronomy.
« Reply #211 on: 17:19:28, 04 January, 2008 »
Thanks Rog.
The discone was not in use this morning, i was using a directional FM dipole and hoping to pick up a Scottish station broadcasting around 105Mhz FM, sadly i live very close to the Mendip mast, (1 mile as the crow flys).
I am waiting for info from my Brother with regard a frequency converter to suit the receiver, also i have 95% of a dipole tuned to around 48Mhz in the shed.
Fingers crossed for the next meteor event, hopefully with visual confirmation.

Dave.
Edit. About to post and saw your message.
We need to find a high power transmitter in the HF/VHF bands over 600 miles away and transmitting at over 60Kw for this to work, also the use of Usb and Lsb will allow us to hear the PINGs.
I am working with very limited gear at the mo for certain reasons, but hoprfully before the next meteor shower, Aquarids, in april i will have something working :)
Meanwhile project jove and some good hints from a podcast i've just been listening to ;)

Dave.
Skywatcher ED80 pro
Celestron 114mm short newt.
ASTSC1C Webcam.
Fuji finepix s3500.
Bresser 10x50 bins.
Switched Systems electronic focuser.
And a couple of eyepieces and filters.

Offline Roger Banks

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Re: Radio astronomy.
« Reply #212 on: 17:43:10, 04 January, 2008 »
If you can find a suitable tx station then, if the freq isn't too high - say 50-70MHz you should be able to pick up pings almost all year round from random meteor events. Indeed,as an aside, this is how a lot of remote pipline monitoring data used to be transmitted in Alaska etc back to base. The stations were synscronised to know when to tx and rx and the information packetized onto small data parcels. If a burst was heard then data was received and an acknowledgement sent back. Slowly but surely the data got through as the hours went by and reliably too. The benefit in doing this was that it needed relatively low power transmissions so was a very efficient means of tranfer from remote locations.
Now they just use a satellite I guess!!
Rog

Offline davemahoney

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Re: Radio astronomy.
« Reply #213 on: 18:00:18, 04 January, 2008 »
Got that Rog :thumbup:
The only thing holding me back at the mo is Financial :roll:
I could do with finding a scanner that covers frquencies between 45> 55Mhz and hopefully use european TV transmitions in conjunction with a Yagi/ dipole antenna.

Dave.
Skywatcher ED80 pro
Celestron 114mm short newt.
ASTSC1C Webcam.
Fuji finepix s3500.
Bresser 10x50 bins.
Switched Systems electronic focuser.
And a couple of eyepieces and filters.

Offline davemahoney

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Re: Radio astronomy.
« Reply #214 on: 15:41:24, 06 January, 2008 »
Here is a link to a site giving simple instructions and advice on radio jove and FM detection of meteors.
http://www.thrushobservatory.org/radio.htm

Dave.
Skywatcher ED80 pro
Celestron 114mm short newt.
ASTSC1C Webcam.
Fuji finepix s3500.
Bresser 10x50 bins.
Switched Systems electronic focuser.
And a couple of eyepieces and filters.

Offline starf

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Re: Radio astronomy.
« Reply #215 on: 16:11:03, 06 January, 2008 »
do you need jupiter to have risen to hear these noises, unless you get pretty lucky and get a reflected signal from somewhere.
rises 07:21; transits 11:13; sets 15:05 verly low in the south.

Offline davemahoney

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Re: Radio astronomy.
« Reply #216 on: 17:16:20, 06 January, 2008 »
do you need jupiter to have risen to hear these noises, unless you get pretty lucky and get a reflected signal from somewhere.
rises 07:21; transits 11:13; sets 15:05 verly low in the south.

Yes. It would be better if jupiter is above the Radio horizon, as the antenna will need to be directional to obtain accurate results, though trees and such like obstructions will be less of a hinderence compared to visual, though they will reduce the signal strength.
The easiest way to test the antenna would be to point it at a point in front of the transit and monitor your computer using "radio sky pipe", (a link to this free software can be found in this thread), or here.
http://www.radiosky.com/skypipeishere.html
As jupiter crosses the antenna the signal will increase in amplitude on a horizontal scrolling graph.
The same antenna can also be used for the Sun, and as we are going into a new solar cycle this could be most interesting.

Dave.
PS the Poll has finished and we need to add 1 to the yes and deduct 1 from unsure, Kim (HooHoo) changed his mind but i could not edit the poll to correct it :)
Skywatcher ED80 pro
Celestron 114mm short newt.
ASTSC1C Webcam.
Fuji finepix s3500.
Bresser 10x50 bins.
Switched Systems electronic focuser.
And a couple of eyepieces and filters.

Offline davemahoney

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Re: Radio astronomy.
« Reply #217 on: 13:29:23, 19 January, 2008 »
This looks like it could be fun.
http://www.southgatearc.org:80/news/january2008/lunar_echo_experiment.htm

They are asking for radio amaturs to try and detect a moonbounce signal, i think the next attempt is around 5pm not sure though as i don't understand what z means in their time schedule.

Dave.
Skywatcher ED80 pro
Celestron 114mm short newt.
ASTSC1C Webcam.
Fuji finepix s3500.
Bresser 10x50 bins.
Switched Systems electronic focuser.
And a couple of eyepieces and filters.

Offline mdbaines1

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Re: Radio astronomy.
« Reply #218 on: 14:27:49, 19 January, 2008 »
zulu - or UTC normally
Martin

Scopes - Skywatcher Explorer 200, ETX105 OTA, WO ZS66SD, Revelation 80mm APO, Ha-PST
Cameras - Atik 16ic / ASTSC3Se / Canon 20D,5D / Watec-120N+
Filters - TrueTek 6+1 wheel with Astonomik LRGBIIc,Ha,CLS
Software - MaximDL+DSLR / K3CCD3 /  ACP
Mount - HEQ5-Pro + Synscan 3.12 / EQDirect

Offline davemahoney

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Re: Radio astronomy.
« Reply #219 on: 14:43:32, 19 January, 2008 »
zulu - or UTC normally
Thanks Martin.
That means we missed it as it would have been between 5-7am today:(
Never mind they will do it again and hopefully i'll get the Email before the event next time.

Dave.
EDIT****I got my dates confused :roll: Saturday morning will be the next one :D
RE-EDIT****Make tomorrow Sunday, i seem to be suffering from altzeimers
Skywatcher ED80 pro
Celestron 114mm short newt.
ASTSC1C Webcam.
Fuji finepix s3500.
Bresser 10x50 bins.
Switched Systems electronic focuser.
And a couple of eyepieces and filters.

Offline Roger Banks

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Re: Radio astronomy.
« Reply #220 on: 17:20:16, 19 January, 2008 »
Better run some wire out then Dave - a 40 metre dipole is 20 meters long (2 x 10 metre sides fed to the unbalanced feed back to the receiver and as high up as you can string it....!
Rog

Offline alisterchapman

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Re: Radio astronomy.
« Reply #221 on: 19:40:07, 19 January, 2008 »
Good grief, that's one hell of an antenna array they've got up there in Alaska. If I'm up I'll fire up the HF rig and have a listen.
Alister Chapman

TV Producer and Storm Chaser
Shortened Skywatcher F5 200mm Newt. Meade LX200 OTA on Celestron CG5. ED80, Modified Canon 350D, Atik 16ic and Meade DSI.

Offline DavidShakeshaft

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Re: Radio astronomy.
« Reply #222 on: 21:08:55, 01 June, 2009 »
If several amatures accross the country have radio telescopes, would it not be possible to use the internet to do some form of VLBI on a amature level?

 

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