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Found 6 results

  1. Greetings, I just recently acquired a 10ft (3.048m) Prime Focus Mesh Satellite Dish. It's not in too bad of shape for it's age (probably late 70's or early 80's?) and I still have yet to test the actuator arm or motor. Those aren't too expensive to replace. It currently has a Dual motorized C/Ku Band LNB feedhorn on it, which is in the range of 3.4-4.2 GHz, from my understanding, is almost entirely TV satellites. I'm looking to downlink GOES Satellites to receive full disk images of earth, and it seems I need some type of LNB in the L-band range of 1600-1700MHz (can't remember exact frequency at the moment). I've searched and searched online and it seems that there's not a lot of L band LNB products for prime focus dishes. Most are made with an Off Axis dish, however I've heard of other's using a prime focus dish for this exact purpose. Does anyone have any links to a product page for a receiver/lnb that will work? Or is there a DIY method for making my own? Would greatly appreciate any help! We are planning on mounting it onto a two wheeled vehicle trailer, and repairing the actuator arm and using a positioner system to control the direction of the dish. Thanks!
  2. Hi folks, for all of you interested in Radio Astronomy, you might be interested on this. In the Island of Sardinia is being built a pretty nice Radio Telescope, 64 metres of diameter supporting frequencies between 0,3 to 100 GHZ. The project is financed by the Autonomous Region of Sardinia and the Italian Space Agency. It will be employed for Radioastronomy, Geodynamics and other space-related matters. Its management is shared between Cagliari Observatory, the Institute of Radioastronomy of Bologna, the ASI and others. I think the whole thing is stil not fully operative (the image below is a Live Feed updated every 10 minutes, look at the sky ), but should you spend any of your holidays in Sardinia, you are allowed to visit the site. Website: http://www.srt.inaf.it/ Wikipedia description: http://en.wikipedia....Radio_Telescope
  3. Hi, is anyone here meteor-watching using Software Defined Radios ? I read that, on average, only 84K meteors that weigh over 10g enter our atmosphere each year, but watching my favourite UK monitoring site, there's been 100s every hour for a while now. If it was 100 on average per hour for a year that would be about ten times the quoted figure above (http://curious.astro.cornell.edu/about-us/75-our-solar-system/comets-meteors-and-asteroids/meteorites/313-how-many-meteorites-hit-earth-each-year-intermediate) I see that their frequency also depends on various other factors, but the American Meteor Society reports an increasing number over the past decade (http://www.amsmeteors.org/members/imo_fireball_stats/). I suppose there are also a growing number of monitoring stations so there are more reports. I bought an SDR but have yet to build the right sort of aerial for meteor-detection (as well as mount it without complaints from neighbours!). Anyone else been doing any of this ? Cheers, Gary.
  4. The Story of Radio Astronomy A talk by James Fradgley FRAS Tues 19 May, 19:30, Old Beams Inn, Ibsley, BH24 3NN (map) From how it all started to the sort of things we're looking at today. James's talk covers: Pre-war history - Jansky and other early pioneers; Jodrell Bank and the Cambridge group - Lovell, Hey and Ryle's developments; Interferometry - Techniques used to improve resolving power; CMB radiation - Its discovery. What is it? Where we are now; Pulsars and Quasars - Their detection; what they are; blazars; active galactic nuclei; Radio Galaxies - What sort of galaxy are they? Structure of radio emission; 21 cm hydrogen line - What we learn from the study of neutral hydrogen More info: http://fordingbridgeastro.org.uk/programme.php
  5. ... by uh, me and a friend called Dave ... I've always been interested in astronomy, but it was a few years ago when some old gaming friends of mine (co-incidentally from SGL) whose own interest in astronomy gave me the push I needed to get involved. I haven't been posting much on SGL for a few months as work (and poor weather for astronomy) has kept me busy and now this project The show is called "2020 Astro" and like the name suggests, it's a fun and small 20 minute podcast and it's published once a month. It's recorded live in a pub too! Not dry as dust, nor boring and it's aimed to educate the beginner and entertain the rest We're completely new to this and have been planning it since the start of the year, so any comments or criticism is welcome if it can help us improve the show. You can find the show on Facebook, @2020Astro, YouTubeand iTunesas well as via our website at www.2020astro.com. If you like it; please like, subscribe or comment and pass it on. We're doing this for the love of astronomy and it's awfully good fun if very hard work! Episode 2: Episode 1: Thanks for listening! Mike P.S. I've attached a few pictures from the last time we recorded - it always helps to put a picture to a name, I think!
  6. I need to get round to building a case for my ST102, but with a lot of diy recently I can't quite face any more sawing. So I had been thinking about a little project for my holiday. I had stumbled onto some websites showing circuit diagrams for VLF radios to listen for lightning - the astronomy bit is that they can also apparently pick up the effects auroras :). Electronics has always been a bit of a mystery to me, I understand what the individual bits do but arranging them to do something useful other than lighting up a LED is beyond me. In the end I opted for the peanut butter radio in the following link; http://www.techlib.com/electronics/vlfwhistle.htm I then ordered a breadboard and enough components to make four (insurance from accidents, dodgy soldering, rabbit attack etc). After a day of poring over the diagram and adding components to the breadboard the creation in the photo came into being. The aerial is the looped wire with the knot in the end, while the wire seemingly connected to nothing is the earth. To my considerable surprise when I turned it on I could hear it making a humming noise. I took it out into the garden and I think that all the A/C power cables nearby are interfering, but I could start to hear the frying pan sound of lightning. Following the schematic was fun, and although the circuitry is all over the place it wasn't as difficult to do as I thought it would be - a bit like a crossword or sudoku. So if you have ever wondered about trying it, give it a go. The prototype is not very rugged as the earth and aerial keep falling out, so the next part is to replicate it on veroboard and fully solder it. And that I think is where everything will get rather more tricky! Dave
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