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Hi Shenanigans
I recall assisting in a project for listening to radio noise from space some time ago.
This was in the range 20 to 30Mhz. Some things to keep in mind:
1. The HF bands are jam packed with manmade signals and noise so it
is rather hard to find a quiet spot to listen to extratrerrestrial noise.
2. Rather than go to the expense of building a special receiver see if
you can get a cheap dual band (ie am/high frequency) receiver and listen around on the hf bands that you wish to study. Such small receiver can often be bought very cheaply at garage sales or markets and likely you already have one!
3. In regard to antennas, a yagi will give you more selectivity and sensitivity in a given direction but keep in mind they are rather large for HF band frequencies and providing mechanical means of pointing can be rather challenging.
4. As above, to reduce unwanted signals, a narrow band audio filter
between the output of the receiver and computer recording device
would help. You may find lots of circuits for these on the net. However,
first you need to find what bandwidth the solar signals occupy. A straight out am receiver will give you about 5Khz or so of audio bandwidth.
5. To embark on such a project you will probably need some (or access to
someone with) rf/electronic expertise.
6. Don't want to turn you off but the friend I was assisting eventually gave up this quest will little to show for it mainly because non extraterrestrial noise was too hard to separate from manmade "noise".
(Almost as bad as big city astronomy!)
Cheers Peter
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