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INFO > SPACE 15.06.21 23:08l 65 Lines 3023 Bytes #999 (0) @ WW
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Subj: Re: [Hackaday] A Hybrid Helical Antenna for the Eshail-2 Geo
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>From: OldbieOne <info@whitechristmasradio.com
Newsgroups: rec.radio.amateur.space
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On 2020-08-05 01:13:50 +0000, Hackaday via rec.radio.amateur.moderated
Admin said:
> amateur radio - Hackaday
>
> ///////////////////////////////////////////
> A Hybrid Helical Antenna for the Eshail-2 Geosynchronous Repeater
>
> Posted: 04 Aug 2020 07:00 PM PDT
> https://hackaday.com/2020/08/04/a-hybrid-helical-antenna-for-the-eshail-2-geosynchronous-repeater/
>
>
>
> Amateur radio operators like to say that working a contact in space can
> be done with a simple handheld transceiver and a homemade antenna. And
> while thats true, its true only for low Earth orbit satellites such as
> the ISS. If you want to reach a satellite in geosynchronous orbit itll
> take a little more effort, and this dual-feed helical ice cream cone
> antenna could really help.
>
> Until recently, the dream of an amateur radio repeater in
> geosynchronous orbit remained out of reach, but that changed with the
> launch of the Qatari satellite Eshail-2 last year. Since then, hams
> from Brazil to Thailand have been using the repeater, and UK-based
> [Tech Minds] has been in the thick of the action. The antenna he
> presents is a hybrid design, needed because of the 2.4-GHz band uplink
> and 10-GHz downlink on the satellite, also known as QO-100. Both
> require a largish dish antenna, with the downlink requiring a low-noise
> block downconverter (LNB) and feed horn. The uplink side of [Tech
> Minds] antenna is a helical design, with three-and-a-half turns of
> heavy copper wire and a tuning section of copper strapping that
> attaches directly to an N-type connector. The helix is just the right
> size for the feed horn of an LNB for the downlink side, nestled in a
> hole in the helical antennas aluminum reflector disc. There are
> 3D-printed parts to support everything, plus a cone-shaped radome to
> keep it all safe from the elements.
>
> It looks like a great design, but sadly, North American and East Asian
> hams can only dream about building one, since QO-100 is below the
> horizon for us. Were jealous, but were still glad the repeater is up
> there. Check out this article for more on how Eshail-2 got the first
> geosynchronous ham repeater.
One of the coolest hacks on Hackaday in years! Thank you for posting this
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