Comments on: Dish antenna for the amateur radioastronomy https://olegkutkov.me/2019/01/27/dish-antenna-for-the-amateur-radioastronomy/ Programming, electronics and diy projects Thu, 11 Feb 2021 00:13:27 +0000 hourly 1 https://wordpress.org/?v=6.5.3 By: Small satellite dish with rotator – Oleg Kutkov personal blog https://olegkutkov.me/2019/01/27/dish-antenna-for-the-amateur-radioastronomy/#comment-987 Thu, 11 Feb 2021 00:13:27 +0000 http://olegkutkov.me/?p=715#comment-987 […] analyzing radio signals is fun. Receiving satellite signal is even better. A few years ago, I had a nice 3m satellite dish with a hydrogen line receiver. Now I have only a small balcony with limited […]

]]> By: Oleg Kutkov https://olegkutkov.me/2019/01/27/dish-antenna-for-the-amateur-radioastronomy/#comment-977 Sat, 16 Jan 2021 22:47:57 +0000 http://olegkutkov.me/?p=715#comment-977 In reply to Ivan.

But it’s better to move backplate corner mounts outside the waveguide. Also, it’s better to use more than two. There is should be good electrical contact.

]]> By: Oleg Kutkov https://olegkutkov.me/2019/01/27/dish-antenna-for-the-amateur-radioastronomy/#comment-976 Sat, 16 Jan 2021 22:34:36 +0000 http://olegkutkov.me/?p=715#comment-976 In reply to Ivan.

Looks good

]]> By: Ivan https://olegkutkov.me/2019/01/27/dish-antenna-for-the-amateur-radioastronomy/#comment-975 Sat, 16 Jan 2021 22:32:23 +0000 http://olegkutkov.me/?p=715#comment-975 Redesigned internal antennas.
https://ibb.co/vx4xg1x

This is how they look in place in the waveguides.
https://ibb.co/7S0VS7z
https://ibb.co/m0d46wL
Horizontal and vertical polarization.

]]> By: Ivan https://olegkutkov.me/2019/01/27/dish-antenna-for-the-amateur-radioastronomy/#comment-972 Sat, 16 Jan 2021 00:32:20 +0000 http://olegkutkov.me/?p=715#comment-972 I decided not to risk with different diameters of the antenna and plug.
In radio astronomy, every little thing can become fatal! 🙂
I used such connectors.

https://ibb.co/X5Fyy5F

My antenna wire came in very tightly.
I solder the other end of the antenna directly into the LNB, without the plugs.

]]> By: Ivan https://olegkutkov.me/2019/01/27/dish-antenna-for-the-amateur-radioastronomy/#comment-971 Fri, 15 Jan 2021 14:35:21 +0000 http://olegkutkov.me/?p=715#comment-971 I already wanted to mount the antenna inside the waveguide. This plug is very mechanically convenient for this.

But I really don’t like the difference in the diameters of the antenna wire and the plug.

Is it better not to do this?
Is the difference in diameters really very important in this case?

https://ibb.co/mX8cd2v

]]> By: eric lindahl https://olegkutkov.me/2019/01/27/dish-antenna-for-the-amateur-radioastronomy/#comment-931 Sat, 22 Aug 2020 22:36:36 +0000 http://olegkutkov.me/?p=715#comment-931 Alternatively, as done by telescope mirror grinders, Spray the dish with soapy water and while still wet,
point at the sun and find the focus. The dish accuracy will be determined this way as well. A perfect
mirror of your sort should focus to a bright spot less than a cm in diameter.

eric-
WN7WNL

]]> By: Oleg Kutkov https://olegkutkov.me/2019/01/27/dish-antenna-for-the-amateur-radioastronomy/#comment-41 Sun, 27 Jan 2019 23:10:21 +0000 http://olegkutkov.me/?p=715#comment-41 In reply to superkuh.

Yes, it’s very good idea!

]]> By: superkuh https://olegkutkov.me/2019/01/27/dish-antenna-for-the-amateur-radioastronomy/#comment-40 Sun, 27 Jan 2019 22:43:53 +0000 http://olegkutkov.me/?p=715#comment-40 My method to find dish focal point is to make an aluminum tape cross on the dish and then point at the sun as you have. It’s still tricky but the increased reflectance and structure of the cross of light helps in finding the focal point.

]]> By: Low noise and low cost amplifier for radio astronomy, 21 cm band. - Oleg Kutkov personal blog https://olegkutkov.me/2019/01/27/dish-antenna-for-the-amateur-radioastronomy/#comment-39 Sat, 26 Jan 2019 22:46:08 +0000 http://olegkutkov.me/?p=715#comment-39 […] the following article you can read more about this […]

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