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Today's echo of the day shows examples of some of the properties you can observe from the UK Meteor Radar project live stream at https://ukmeteorbeacon.org/beaconclient/. The first echo. At the bottom of the screens was seen strongly by the Norman Lockyer receiver ( No 1, top left) and by both the NW Hampshire receivers, ( Nos 4 and 5, Bottom row) but not by the Armagh receiver (No 2). This shows that this echo was highly directional and either not strongly linearly polarised or, more likely, that it was linearly polarised but aligned equally for both vertical and horizontal antennas perhaps at about 45 degrees to both. The next very small echo was only seen by receivers 4 and 5, much more strongly with horizontal polarisation than with vertical polarisation. The next echo immediately above the last is also much stronger at the horizontally polarised antenna ( receiver 4 ) indicating that it is strongly linearly polarised. It is also directional as receiver 2, Armagh didn't “see” it. This head echo has another interesting feature, the pulsing effect. This is caused by interference patterns resulting from the ( multi wave ) length of the ionised region “moving across” the receiving antenna as the meteor travels across the sky. Other echoes are seen on the NW Hampshire Horizontally polarised display but not others due mainly to linear polarisation and directionality. Receivers 3 and 6 have been edited from this image as they are not in service. The Blairgowrie receiver No 3, is streaming data but as yet has no antenna, poor weather having delayed it's erection. Brian
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What are the different types of aerials recommended for 143Mhz meteor scatter? I would like a list to add to my talk. I use a Moxon but I know there are other types Andy Sent from Outlook for Android
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Terrestrial Navigation from Cosmic Radiation Jaron Samson ESTEC, European Space Agency Navigation on earth is typically performed using satellite-based systems such as GPS. However, even if GPS is widely used, it has several weaknesses. For instance, it cannot be used underwater or underground. A few years ago, the concept of underwater and underground navigation using muons has been demonstrated. This presentation will address the principles, strengths and weaknesses of navigation using muons. The Zoom link will be sent out on Thursday 6th Feb. If you are not on the distribution list and want to join please let me know. Friday 7th March 19:30 (19:30 UTC) Alex Pettit Winter Springs, Fla Project HLine3D : A Beginners Guide to Hydrogen Emission Line Microwave Radio Astronomy A student project described (https://github.com/AP-HLine-3D/HLine3D) Registration for EUCARA25 open's on Monday 3rd Feb. visit - www.eucara.org -- ??? Paul Hearn ?? paul@... ?? RA Section Director ??
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Meteor Radar Live display
There will be a scheduled outage of the live display tomorrow 20th. Brian
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RAZoom Feb. 7th 19:30 GMT Terrestrial Navigation from Cosmic Radiation'
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Hi Phil, The cause of the odd traces from December was quite simple - the transmitter was having a Christmas holiday and was off air from 24th to 31st December. I monitor a number of frequencies and have always found 23.4kHz to be the most unstable especially of course in winter time. You can often spot a SID in the data when you can see a match at the other freqs, which is why I don't use a dedicated receiver and use spectrum lab instead for my monitoring. I thought that my paper on modelling SIDs was on the RAG website, but I can't find it so I've attached it to this email. The paper expands on John's interference explanation, but despite all the maths is a simplified view. If anyone can supply the proper waveguide equations I'd be very interested in using them! Cheers, Mark
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EU Conference on Amateur Radio Astronomy (EUCARA25)
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The BAA Radio Astronomy Section with RAL Space are pleased to announce the EU Conference on Amateur Radio Astronomy. Further information and registration can be found at eucara.com. This conference will be held at the Harwell and Science Innovation Centre, September 5th – 7th. We are delighted that Professor Jocelyn Bell Burnell will be our keynote speaker. This event will have speakers from academia and the amateur community. There will be posters and demonstrations. The event organisers are Paul Hearn and Andrew Thomas. -- ??? Paul Hearn ?? paul@... ?? RA Section Director ??
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How to make a hydrogen line radio telescope
The Hydrogen Line Telescope Andrew Thornett 2025 Beneath the sky so vast and deep, Where ancient signals drift and sleep, A secret song from stars unknown— At 1420.405 MHz, it's shown. 1. The Dish or Aerial Wide First, you need to catch the light, But not in hues of day or night. A dish of parabola grand, To gather waves from distant land. 2. Waveguide’s Silent Flow A waveguide smooth and bright, Guides the whispers through the night. A metal tunnel, carved with care, To keep weak echoes trapped in air. 3. The LNA Stands Tall Next, a filter cold and keen, A low-noise preamp, crisp and clean. It lifts the whispers, makes them bold, Yet guards their form from growing cold. 4. The SDR's Keen Ear A software radio takes its place, To turn these waves to time and space. A digital heart that scans the past, To hear the hydrogen’s song at last. 5. The Computer’s Final Sight Now comes the code to draw the chart, To map the clouds that drift apart. A plot of peaks, a spectral line, Reveals the gas in curves so fine. The Universe in Silent Sound From all these parts, a scope is made, To pierce through time and gas that swayed. A whisper faint, yet clear and grand, From cosmic seas to guiding hand.
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Terrestrial Navigation from Cosmic Radiation - Now Online
Hi Radio Astronomy Section Zoom Friday the 7th Feb 2025 Terrestrial Navigation from Cosmic Radiation by Jaron Samson Radio Frequency Systems Division ESTEC, European Space Agency Video is now on YouTube here You can find links to previous meeting videos and associated materials here Kind Regards John B
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Nothing particularly interesting here but just to notify that I am preparing a receiver for shipment to a new location in Scotland to extend the range of reflection geometries available from the network. See the live display at https://ukmeteorbeacon.org/beaconclient/ . Receiver client 3 is actually still on test at NW Hampshire so ignore it for now. It's receiver 3 on the live display. I will let everyone know when it is operating from it's new location. Brian
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Hi All, I have prepared this block diagram - so I thought I'd post it here in case anyone else would find it useful in their presentations etc. - please free to use or publish it as you wish. Andy
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Dish for H-Line observations
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Sourcing a dish for H-Line observations can be a challenge in the UK. The link below may be useful if you are looking for one.... https://www.crowdsupply.com/krakenrf/discovery-dish The cost is about ?224 excluding taxes, shipping etc. -- ??? Paul Hearn ?? paul@... ?? RA Section Director ??
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Getting started in H-Line radio observing
I am proposing to start an online Zoom series of sessions, to support people who would like to get started in hydrogen line (1420 MHz) radio observing. It will be aimed at folks who have never done this before, beginners but also more experienced radio astronomers who have never tried H-Line. This will be at a basic level, and will cover basic theory (I’m only a GP!), hardware and software, and then lead through helping folks to select what they would like to do and then the group will give support to its members as they embark on their first projects. This is intended for people who want to give it a go practically – expect the costs of purchasing materials for a project of this nature to be around ?200 plus you will need some form of computer which does not need to be powerful nor modern – I use 2nd hand mini-PCs, some people use Raspberry Pis, etc. At this stage, I would like to gauge whether there is any interest in this – so if it interests you then please email me on andrew (at) thornett (dot) net Andy Dr Andrew Thornett M6THO www.astronomy.me.uk
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I have three receivers: 1. Complete kit for assembly (reclosable plastic bag in pictures) 2. Built and ready to use in steel enclosure with meter (orange in pictures) 3. Built and ready to use in aluminum enclosure with meter (silver in pictures) The built units were working when placed in storage several years ago. More pictures available. These will ship from Anchorage, Alaska USA. Price for each is 100 USD + shipping. Estimated shipping to UK is about 35 USD per unit. If interested, contact me directly whitreeve@... Whit -- Whitham D. Reeve Anchorage, Alaska USA ---
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Morocco
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On holiday in Marrakech once I bought some magnetic rocks, said to be meteorites gathered in the desert, but on return home was told they were volcanic ejecta descending through the atmosphere. Andy g0sfj Yahoo Mail: Search, organise, conquer
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Meteoritics & Planetary Science Journal
Hi, I spotted this journal on a television programme from Al Maghribia TV in Morocco about meteorites in that country. https://onlinelibrary.wiley.com/journal/19455100 Best Regards, Mike.
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EUCARA25 web address correction
Thankyou everyone who pointed out the correct syntax for our web address. Should be https://eucara.org/ Do take a look. The BAA Radio Astronomy Section with RAL Space are pleased to announce the EU Conference on Amateur Radio Astronomy. Further information and registration can be found at https://eucara.org/ This conference will be held at the Harwell and Science Innovation Centre, September 5th – 7th. We are delighted that Professor Jocelyn Bell Burnell will be our keynote speaker. This event will have speakers from academia and the amateur community. There will be posters and demonstrations. The event organisers are Paul Hearn and Andrew Thomas. -- ??? Paul Hearn ?? paul@... ?? RA Section Director ??
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I thought this might interest you - WR650 Waveguide 1420MHz technical drawing from ChatGPT Andy
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Image Name
Sat 8:39am
Sat 8:39am