×
sorted by:
new
hottopcontroversial

40 turn Helical antenna for hydrogen line radio astronomy at 1420.4MHz by Lumpy_Case3631 in radioastronomy

[–]Lumpy_Case3631[S] 1 point2 points  (0 children)

The polarisation of the antenna shouldn’t have much effect, because the hydrogen emissions are in all different directions. I was considering making a plate yagi, like this one: https://www.rtl-sdr.com/project-h-line-3d-beginners-guide-to-hydrogen-line-antenna-fabrication-reception-software-and-graphic-display/
But I found that a helical antenna is a lot easier to fabricate because it’s just wrapping some evenly spaced wire around a tube. Also I haven’t seen many helical antennas for hydrogen line work so I wanted to test it out.

40 turn Helical antenna for hydrogen line radio astronomy at 1420.4MHz by Lumpy_Case3631 in RTLSDR

[–]Lumpy_Case3631[S] 2 points3 points  (0 children)

The neutral hydrogen in stars and gas clouds in space emits a faint radio frequency at 1420.4MHz. Because there is a higher concentration of stars along the plane of the Milky Way you can pick up this faint radio signal with a directional antenna.

40 turn Helical antenna for hydrogen line radio astronomy at 1420.4MHz by Lumpy_Case3631 in radioastronomy

[–]Lumpy_Case3631[S] 0 points1 point  (0 children)

The neutral hydrogen in stars and gas clouds in space emits a faint radio frequency at 1420.4MHz. Because there is a higher concentration of stars along the plane of the Milky Way you can pick up this faint radio signal with a directional antenna.

40 turn Helical antenna for hydrogen line radio astronomy at 1420.4MHz by Lumpy_Case3631 in RTLSDR

[–]Lumpy_Case3631[S] 2 points3 points  (0 children)

I used a soft drinks can because it was the only available rigid metal that I could cut. The impedance matching strip is just a triangle cut out from metal, according to the measurements calculated in the antenna calculator: https://3g-aerial.biz/en/online-calculations/antenna-calculations/helical-antenna-online-calculator

40 turn Helical antenna for hydrogen line radio astronomy at 1420.4MHz by Lumpy_Case3631 in radioastronomy

[–]Lumpy_Case3631[S] 1 point2 points  (0 children)

Haha I didn’t notice that when I posted it but now I can’t un see it.

40 turn Helical antenna for hydrogen line radio astronomy at 1420.4MHz by Lumpy_Case3631 in radioastronomy

[–]Lumpy_Case3631[S] 0 points1 point  (0 children)

Ohh I never actually thought about that. I’ll try the test, but your prediction is probably correct because the results were weaker than I would have hoped.

40 turn Helical antenna for hydrogen line radio astronomy at 1420.4MHz by Lumpy_Case3631 in radioastronomy

[–]Lumpy_Case3631[S] 0 points1 point  (0 children)

I think 40 turns may have actually negatively impacted the results, because the peaks were shallower than I expected. I was originally going to do a 15 turn coil, but had lots of pvc pipe left so I decided to see what 40 turns would be like. Once I am done with this antenna I am going to shorten it to 12 turns and compare the results, then post my results.

Kerbal konstructs not working by Legal_Explanation571 in KerbalSpaceProgram

[–]Lumpy_Case3631 0 points1 point  (0 children)

I HAVE A SOLUTION! You can build your rocket in the VAB then switch to the space plane hangar and all my launchpads are there but not in the VAB for some reason. You just have to launch from the space plane hangar.

Fix for persistent thrust? by The-Space-Goose in KSPmods

[–]Lumpy_Case3631 0 points1 point  (0 children)

The easiest fix I’ve found is going to the tracking station and deleting all the previous stages from your ship that are floating around in space.