Graves Meteor detection

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goldchip
Posts: 4
Joined: Fri Sep 30, 2016 8:59 am

Graves Meteor detection

Post by goldchip » Mon Oct 17, 2016 9:16 am

Hi all,
Here in East Sussex I'v spent some time now trying to set up a meteor scatter receiver using the Graves Radar site in France, but so far without sucess.

My set up is as follows;
5 element diamond yagi (2M ham band) about 5M above ground level (on roof of bungalow)
LNA 4ALL at the mast head
30-35 Metres of RG6 coax
My home made Bias tee (Adams design)
RTL SDR
SDR# software.

I can receive fm stations and ham conversations in the 2m band, but dont receive anything at all when tuned to the Graves frequency of 143.049Mhz.

The yagi is horizontal, would mounting it verticaly be worth a try?

Others seem to make it look very easy, Any help would be appreciated.

Thanks.

Username
Posts: 473
Joined: Sun Oct 09, 2016 7:27 am

Re: Graves Meteor detection

Post by Username » Mon Oct 17, 2016 2:55 pm

The yagi is horizontal, would mounting it verticaly be worth a try?
sound a little weird for me. the Fr Antenna send up in the Sky and the Signal get bounced off by an Meteorite what i understand.
So why not pointing in the skyp?

goldchip
Posts: 4
Joined: Fri Sep 30, 2016 8:59 am

Re: Graves Meteor detection

Post by goldchip » Mon Oct 17, 2016 7:10 pm

The antenna needs to be aimed at the source of the reflected signal, which in this case is slightly above the horizon. At the moment I have it mounted horizontally. I just wondered if it would be better to still aim it in the same direction, but mount it on its side to receive a vertically polarised signal.

Giftmacher
Posts: 17
Joined: Mon Aug 01, 2016 4:29 pm

Re: Graves Meteor detection

Post by Giftmacher » Sat Dec 17, 2016 12:29 pm

Can I use a QFH antenna with LNA for this?

jsalsburg
Posts: 4
Joined: Wed May 15, 2019 9:56 pm

Re: Graves Meteor detection

Post by jsalsburg » Wed May 15, 2019 10:39 pm

Using the GRAVES Space RADAR for Meteor detection, you need to point your antenna above the horizon. Computing the angle is the chore you face; more than 2 degrees and less than 30 degrees is ideal, depending on you relative location to the Transmission. Subscribe to radiometeoren <ls.vvs.beforum> for help, these guys have been doing what you want to do for decades. You also face detecting very low level signals, which requires a large multi-element yagi with a LNA fixed to the feed element, the more elements the better.
http://radar.salsburg.com/

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