Solar 11 March 2025 (Dark Sky Observatory)
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Great Catches Richard! Carl On Wed, Mar 12, 2025 at 2:08?AM Sabine Cremer via <sc=[email protected]> wrote:
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On Wed, Mar 12, 2025 at 12:59 PM, Richard Gray wrote:
I would love to see a photo of your Moxon antenna. Of course! Attached, you'll find a photo of my weekend house in a small community of only 200 houses. As is typical with radio telescopes, it's located in a valley, so the neighbors can interfere my reception exclusively.
The Moxon antenna is the frame halfway up the mast. At the very top is a pickup for a VLF receiver mounted (e-field probe). The old satellite dish in the background is a relic from earlier TV days.
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Sabine
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Germany Standard time: UTC +1 hour |
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Hi Sabine,
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In that picture, it looks like your Moxon's beam is aimed at the horizon. Would it work better aimed at Jupiter's transit elevation? -- Dave On 3/13/25 14:32, Sabine Cremer wrote:
On Wed, Mar 12, 2025 at 12:59 PM, Richard Gray wrote: |
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On Thu, Mar 13, 2025 at 08:16 PM, Richard Gray wrote:
The antenna looks so professional because it is. It's a UK-made antenna from InnovAntennas.
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When I had it set up, I said to my neighbor Ruth with a lump in my throat: "That thing looks pretty ugly, doesn't it?" But she just laughed and said she thought it was great that I was doing such amazing things like radio astronomy, and that the antenna alone looked absolutely impressive.
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Ruth is a really great and nice woman.
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Sabine
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Germany Standard time: UTC +1 hour |
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On Fri, Mar 14, 2025 at 08:59 AM, Dave Typinski wrote:
In that picture, it looks like your Moxon's beam is aimed at the horizon. Would it work better aimed at Jupiter's transit elevation? That would be a good idea. I just don't know how to adjust the mast mount so I can tilt the antenna.
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Sabine
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Germany Standard time: UTC +1 hour |
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Hi Sabine,
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Given the pattern that Huub mentioned (thanks Huub!), the work involved in tilting the Moxon may not be worth it. On the other hand, one or three of these -- or something similar -- might do the trick without too much hassle: Use that with a short piece of straight tube to mount the Moxon at an angle. Or two pieces if the swivel doesn't lock. -- Dave On 3/17/25 13:52, Sabine Cremer wrote:
On Fri, Mar 14, 2025 at 08:59 AM, Dave Typinski wrote: |
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Thank you for the diagrams, Huub!
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The free-space modeling result is quite reminiscent of the HB9CV antenna, with its pronounced null point on the back of the radiation pattern. This becomes significantly less apparent when setting up the antenna at a height of approximately 4 meters, as recommended by the RJ team for the dual dipole. However, the vertical pattern is then quite well adapted to the task.
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Sabine
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Germany Standard time: UTC +1 hour |
Sabine Cremer
Carl Pajak Phone
Dave Typinski
