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'How to use radio signals to catch meteors'


Hawksmoor

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Having read this article in the June edition of the Sky at Night magazine I became unusually fired up by the thought of a bit of DIY. After some preliminary rumaging around in B&Q and Maplins, I set about constructing a Yagi aerial under the cover of my car port. Tension mounted as the July edition of Sky at Night, containing part 2 of 'How to use radio signals to catch meteors', landed on our door mat. Following tricky negotiations with my partner, the long suffering Anita, I ordered the pricey bit, the FUNcube Dongle Pro +. I await the delivery of this latest bit of kit in high expectation.

In the mean time I have completed and erected the aerial which now sways incongruously above the roof of my shed. Its been up two hours or more and as yet I have received no objections from my neighbours. I have decided, rather ostentatiously, to call my shed the Jodrell Plank Observatory and the completed installation the LVST (Lowestoft Very Small Telescope).

Anita has not really stopped laughing since I erected the aerial, I'm not sure why but hey she is a girl!

I'm rather hoping I can get this all to work otherwise I'm out of pocket to the tune of £200 and my wife, children and grandchildren will probably have me put in a home for eccentric old folk.

blogentry-6990-0-44192800-1402943106_thu

:smiley:

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I am thinking about getting the FUNcube dongle. As I live in a studio apartment erecting an external antenna is an issue. I have a few shortwave receivers and at present use a random wire in the loft/attic and the earth wire terminated to the cold water pipe in the airing cupboard & 'Slinky' antenna streched across the ceiling in the bedsit room.

I do like the names you have given your shed and installation!

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Weird you mention this as I was reading about this technique in a book I have called 'Handmade Electronic Music: The Art of Hardware Hacking' by Nicolas Collins.

It has a chapter dedicated to doing exactly this.   I feel an aerial coming on but its a secret at the moment !   I will try and dig out some details on what the books states another time.  It has some very good info in that may be of interest to you.

 

James

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I read the s@n article but felt pretty underwhelmed by the second installment. I have vista as an operating system and it turns out the software isnt compatible with that system so im glad I never made the aeriel between editions.

your system looks good though so it will be good to see how it goes,

cheers

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Hi,

 

In a previous life armed with a radio amateur license, a VHF set (2m band) and a 100W amplifier we used to go out on the moors and try Meteor Scatter.  Normally VHF is limited in range to about 100 - 200 miles, slightly further if you get a Tropospheric reflection, but with a reflection from a meteor trail which are very high in the sky, 1,500 to 2,000 miles is possible.

 

You either transmit your call sign and then leave a break and a station in say Italy or Spain will respond if you are lucky enough to be transmitting when a meteor comes through.  Or, you just listen for a strong station and reply when they leave a break.  The whole conversation is over in a couple of seconds.

 

Small meteors cause a very brief reflection and the distant station is head as a 'ping'.  Larger meteors or several at once can give several seconds of reflection and as the ionised trail moves, a Doppler shift can be heard requiring tuning of the receiver to be able to hear the whole conversation.  Really good operators will make 3 or 4 contacts, exchanging calls signs and signal strength reports in one long reflection.

 

It never ceased to amaze me the distance that could be obtained on a band that is normally relatively short range.

 

I haven't used a FUNCube so couldn't say how well it would work but we used to build our own Yagi (usually a 9 or 15 element) at 145MHz and fix pointing towards southern Europe.  I would have to say I haven't done any of this for nearly 30 years, but it was very interesting at the time.

 

Robin

 

Robin

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I used to do the same Robin but from home.

200Watts and 2x13ele Cushcrafts and a DTR for high speed CW.

 

It was always exciting as you never knew what would happen.

 

From my hole in the ground I could reach out about 2000kms maximum.

 

Mike still G1HWY

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Thanks for all your comments. I'm never too sure what I'm doing astronomy wise and electronically speaking a red mist descended somewhere after valves but before printed circuits. Anyway I followed the instructions found on the Internet and in the Sky and Night Magazine and low and behold it actually works. I too have encountered the Vista Spectrum Lab software issue and had to borrow my wife's laptop that runs using Windows 7.  It would have been helpful if Maplins provided a 'how to' sheet in with the BNC coax connector. Lots of cursing and the plug still drops off if I look at it. Grrr! The FunCube Dongle Pro+ and supporting software all works well. Very efficiently provided by Howard at Halincrest Ltd. The Yagi aerial works nicely and I have captured a few meteors. Saving up for a second hand computer to wire up and leave running in monitor mode.

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