Recently Browsing 0 members
No registered users viewing this page.
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 ?
A while back I bought a copy of 'The radio sky and how to observe it' and finally got round to building the aerial for detecting SIDs.
I have had it running this afternoon and have been logging the results.
I think it is all working but one thing I have noticed is that the signal to noise ratio (vertical axis) is pretty poor.
Does anyone have an idea about the point at which the ratio becomes too low to yield meaningful results?
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!
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
Summer's heatwave ends with thunderstorms throughout the UK ...here in Kelso was no exception with this night storm and dramatic lightning looking out beyond Poynder Park rugby ground.
Thank goodness for the waterproofing of the Pentax K5 body & lens!
Pentax 18-135mm lens @ f7.1
Kelso Lightning Tue 23rd July by mikeyscope, on Flickr