BAA RA Section H-Line group meeting #12

[Conrad Cardano]

Hi,

I could not attend the meeting, but I did watch it on YouTube.

I enjoyed it a lot.

I was fascinated with the folding antenna by Jason Burnfield.  Very clever!

Are there any plans or drawing for this antenna?

Thanks for reading.

Conrad Cardano 

[Marcus D. Leech]

I should drop in on one of those meetings soon.  Perhaps talk about our H1 doppler measurements.

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[Alex P]

Conrad, Here are detailed plans for  a Very Simple Folding HLine Antenna = an    "Afternoon Project"

https://github.com/AP-HLine-3D/HLine3D/blob/main/21cm_Step1a_Antenna_H1Umbrella_ConstructionDetails_Feb25_03.pdf

Regards,

Alex Pettit

Project HLine3D

==================================================

[Jim Brown]

Where does one obtain the "umbrella" part?

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[b alex pettit jr]

Amazon or any Photo Supply Shop 

Just Ensure the ribs are Fiberglass

[b alex pettit jr]

Here's a Video :)

Umbrella Antenna

https://www.youtube.com/watch?v=ymclkNnCeCc

[Jim Brown]

Thank you.  Looking on Amazon I see a number of them with different curvatures.  Does that matter?

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[b alex pettit jr]

None are truely parabolic,  just pick a deep one.

Or send me links to a few & I'll suggest one.

Pick one that is Not Lined ( & fiberglass ribbed )

Alex

[andrew....@googlemail.com]

Might be worth waiting a little, Jim – Jason and I are hoping to collate instructions for building his nifty 150cm wooden ribbed umbrella scope and I will then put them online and send everyone here a link to access them.

Of course, Alex’s umbrella scope using photo umbrella also works very well – so either option will work well for you!

Andy

 

From: 'Jim Brown' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Sent: 10 April 2026 15:29
To: 'b alex pettit jr' via Society of Amateur Radio Astronomers <sara...@googlegroups.com>
Subject: Re: [SARA] BAA RA Section H-Line group meeting #12

 

Thank you.  Looking on Amazon I see a number of them with different curvatures.  Does that matter?

On 4/10/2026 10:22, 'b alex pettit jr' via Society of Amateur Radio Astronomers wrote:

Amazon or any Photo Supply Shop 

Just Ensure the ribs are Fiberglass

 

 

On Friday, April 10, 2026 at 10:16:29 AM EDT, 'Jim Brown' via Society of Amateur Radio Astronomers <sara...@googlegroups.com> wrote:

 

 

Where does one obtain the "umbrella" part?

On 4/10/2026 03:08, 'Alex P' via Society of Amateur Radio Astronomers wrote:

Conrad, Here are detailed plans for  a Very Simple Folding HLine Antenna = an    "Afternoon Project"

 

https://github.com/AP-HLine-3D/HLine3D/blob/main/21cm_Step1a_Antenna_H1Umbrella_ConstructionDetails_Feb25_03.pdf

 

Regards,

Alex Pettit

Project HLine3D

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[b alex pettit jr]

The small PhotoUmbrella project is easy, low cost, lightweight, highly portable, and provides an introduction to this technique.

AND, the Loop Feed is compatible with Both.

Here is the latest  update for a more reliable Feed

[b alex pettit jr]